Final California 2020 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 3 - Central Coast Region

Water Body Name:	Warden Creek
Water Body ID:	CAR3102301020021002232250
Water Body Type:	River & Stream

DECISION ID	125707	Region 3
Warden Creek

Pollutant:	Escherichia coli (E. coli)
Final Listing Decision:	Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Reason for Delisting:	Applicable WQS attained; due to change in WQS
Expected TMDL Completion Date:	2035
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	The State Water Board’s Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California (the ISWEBE Plan) contains two bacteria water quality objectives applicable to the REC-1 beneficial use, which were adopted on August 7, 2018. Because the salinity level of this waterbody is equal to or less than 1 part per thousand 95 percent or more of the time, the E. coli bacteria objective applies. In accordance with section 6.1.5.3 of the Listing Policy, data should be representative of the critical timing that the pollutant is expected to impact the waterbody. E. coli populations may fluctuate substantially on a daily, seasonal, or yearly basis. Lacking constant inputs, indicator bacteria do not persist in the environment for a long period and effects are of relatively short duration. As a result, the historic levels of E. coli in the waterbody may be a poor indicator of current risks to human health, particularly when more recent data are available to sufficiently assess the water quality standard. Additionally, water quality conditions in waterbodies may change as a result of management actions that have been implemented to address E. coli. Unrepresentative data may result in incorrectly placing or not placing a water body segment on the CWA section 303(d) List, which could result in the unnecessary expenditure of public resources or missing a human health problem. Historic lines of evidence for data collected prior to 2010 were evaluated pursuant to these considerations and were not used to assess water quality standards attainment because they do not meet the temporal representation requirements of section 6.1.5.3 of the Listing Policy. All samples are evaluated using the statistical threshold value (STV) water quality objective for water contact recreation (ISWEBE, SWRCB 2019). The water quality objective states that the STV shall not be exceeded by more than 10 percent of the samples collected in a calendar month. Where there are more than one samples collected within any six-week period, a geomean of those samples is calculated and evaluated using the geomean water quality objective for water contact recreation (ISWEBE, SWRCB 2019). Although four lines of evidence are available in the administrative record to assess this pollutant, this decision is based upon evaluation of the E. coli data collected 2010 which is most representative of existing conditions in the waterbody. Two out of the 45 samples collected since 2010 exceed the STV water quality objective for water contact recreation (see LOEs 149935 and 149925). No geomeans could be calculated for this data. The data were collected between 2011 and 2015 and represent a range of hydrologic conditions (both wet and dry years). This sample count of data collected since 2010 is adequate to determine beneficial use support in accordance with the Listing Policy. Note, there are two lines of evidence summarizing historic data (data collected prior to 2010) compared to the USEPAs Ambient Water Quality Criteria for Bacteria (USEPA, 1986). Thirty-three of the 78 historic samples exceed the USEPA criteria set to protect for water contact recreation. These data are not used for making this decision or used in the final beneficial use ratings. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) List because applicable water quality standards for the pollutant are not being exceeded. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of two of the 45 samples collected since 2010 exceed the STV water quality objective and this meets the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) List because applicable water quality standards for the pollutant are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:	Although four lines of evidence are available in the administrative record to assess this pollutant, this decision is based upon evaluation of the E. coli data collected 2010 which is most representative of existing conditions in the waterbody. Two out of the 45 samples collected since 2010 exceed the STV water quality objective for water contact recreation (see LOEs 149935 and 149925). No geomeans could be calculated for this data. The data were collected between 2011 and 2015 and represent a range of hydrologic conditions (both wet and dry years). This sample count of data collected since 2010 is adequate to determine beneficial use support in accordance with the Listing Policy. Note, there are two lines of evidence summarizing historic data (data collected prior to 2010) compared to the USEPAs Ambient Water Quality Criteria for Bacteria (USEPA, 1986). Thirty-three of the 78 historic samples exceed the USEPA criteria set to protect for water contact recreation. These data are not used for making this decision or used in the final beneficial use ratings. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) List because applicable water quality standards for the pollutant are not being exceeded. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of two of the 45 samples collected since 2010 exceed the STV water quality objective and this meets the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 125707, Escherichia coli (E. coli) Region 3      Warden Creek
LOE ID:	149925
Pollutant:	Escherichia coli (E. coli)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	14
Number of Exceedances:	1
Data and Information Type:	PATHOGEN MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data for Warden Creek to determine beneficial use support and the results are as follows: 1 of the 14 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The bacteria water quality objective applicable to all non-saline waters, is a Statistical Threshold Value (STV) of 320 cfu/100 mL. The applicable STV shall not be exceeded by more than 10 percent of the samples collected in a calendar month, calculated in a static manner (ISWEBE 2018).
Objective/Criterion Reference:	Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s), station(s): 310UWR
Temporal Representation:	The samples were collected between the days of 2011-01-25 and 2013-01-10 .
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 125707, Escherichia coli (E. coli) Region 3      Warden Creek
LOE ID:	149935
Pollutant:	Escherichia coli (E. coli)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	31
Number of Exceedances:	1
Data and Information Type:	PATHOGEN MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data for Warden Creek to determine beneficial use support and the results are as follows: 1 of the 31 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The bacteria water quality objective applicable to all non-saline waters, is a Statistical Threshold Value (STV) of 320 cfu/100 mL. The applicable STV shall not be exceeded by more than 10 percent of the samples collected in a calendar month, calculated in a static manner (ISWEBE 2018).
Objective/Criterion Reference:	Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s), station(s): 310WRP
Temporal Representation:	The samples were collected between the days of 2011-03-29 and 2015-03-10 .
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 125707, Escherichia coli (E. coli) Region 3      Warden Creek
LOE ID:	52704
Pollutant:	Escherichia coli (E. coli)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	8
Number of Exceedances:	3
Data and Information Type:	PATHOGEN MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 3 of 8 samples exceed the criterion for Escherichia coli.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	USEPA Ambient Water Quality Criteria for Bacteria -1986.
Objective/Criterion Reference:	Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
Evaluation Guideline:	Single sample maximum allowable density for E. coli in freshwater is 235 MPN/100mL (as stated in Table 4, page 15 of the USEPA Ambient Water Quality Criteria for Bacteria -1986).
Guideline Reference:	Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 125707, Escherichia coli (E. coli) Region 3      Warden Creek
LOE ID:	47855
Pollutant:	Escherichia coli (E. coli)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	70
Number of Exceedances:	30
Data and Information Type:	PATHOGEN MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 30 of 70 samples exceed the criterion for Escherichia coli.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	USEPA Ambient Water Quality Criteria for Bacteria -1986.
Objective/Criterion Reference:	Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
Evaluation Guideline:	Single sample maximum allowable density for E. coli in freshwater is 235 MPN/100mL (as stated in Table 4, page 15 of the USEPA Ambient Water Quality Criteria for Bacteria -1986).
Guideline Reference:	Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 7/1/2002 10:30:00 AM-2/11/2010 11:15:00 AM.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2

DECISION ID	131028	Region 3
Warden Creek

Pollutant:	Fecal Coliform
Final Listing Decision:	Delist from 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2018)
Revision Status	Revised
Reason for Delisting:	Applicable WQS attained; due to change in WQS
TMDL Name:	Morro Bay Pathogens
TMDL Project Code:	22
Date TMDL Approved by USEPA:	01/20/2004
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4 of the Listing Policy due to a change in water quality standards. The State Water Boards Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California (the ISWEBE Plan) contains two bacteria water quality objectives applicable to the REC-1 beneficial use which were adopted on August 7, 2018: where the salinity level of a waterbody is equal to or less than 1 part per thousand 95 percent or more of the time, the E. coli bacteria objective applies; and where the salinity level of a waterbody is greater than 1 part per thousand 95 percent or more of the time, the Enterococci bacteria objective applies. These objectives supersede the fecal coliform water quality objective for water contact recreation. Consequently, the fecal coliform objective for water contact recreation is no longer applicable to this waterbody and those LOEs have been removed from this decision. Therefore, this waterbody is being removed from the CWA section 303(d) List under section 4 of the Listing Policy due to a change in water quality standards. However, two lines of evidence (LOEs) are available in the administrative record to assess this pollutant and the non-contact recreation use. Therefore, this pollutant is being considered for placement on the CWA section 303(d) List under section 3.3 of the Listing Policy. Under section 3.3 a single line of evidence is necessary to assess listing status. One of the 16 samples exceed the water quality objective for non-contact recreation. This sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 26 samples is needed to determine if a beneficial use is supported and a minimum of five exceedances is needed to determine if beneficial uses are not supported using table 3.2. Therefore, the use support rating is set to 'insufficient information'. After review of the available data and information for the non-contact recreation beneficial use, RWQCB staff concludes that the water body-pollutant combination should not be placed on the CWA section 303(d) List because applicable water quality standards for the pollutant are not being exceeded. In accordance with section 2.2 of the Policy, there is sufficient justification to place it in the Being Addressed portion of the 303(d) List because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of the 16 samples exceed the water quality objective for non-contact recreation, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. The Morro Bay Pathogens TMDL has been approved by the USEPA on 1/20/2004. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the CWA section 303(d) List under section 4 of the Listing Policy due to a change in water quality standards. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. This water body pollutant combination should be placed in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 131028, Fecal Coliform Region 3      Warden Creek
LOE ID:	52706
Pollutant:	Fecal Coliform
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Non-Contact Recreation
Number of Samples:	8
Number of Exceedances:	1
Data and Information Type:	PATHOGEN MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 1 of 8 samples exceed the criterion for Coliform, Fecal.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for non-contact water recreation uses (Section II.A.2. Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries, II.A.2.a) states the following: Fecal coliform concentration, based on a minimum of not less than five samples for any 30-day period, shall not exceed a log mean of 2000/100 ml, nor shall more than ten percent of samples collected during any 30-day period exceed 4000/100 ml.
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 131028, Fecal Coliform Region 3      Warden Creek
LOE ID:	11593
Pollutant:	Fecal Coliform
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Non-Contact Recreation
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PATHOGEN MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for Coliform, Fecal.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for non-contact water recreation uses (Section II.A.2. Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries, II.A.2.a) states the following: Fecal coliform concentration, based on a minimum of not less than five samples for any 30-day period, shall not exceed a log mean of 2000/100 ml, nor shall more than ten percent of samples collected during any 30-day period exceed 4000/100 ml.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):

DECISION ID	109141	Region 3
Warden Creek

Pollutant:	Oxygen, Dissolved
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	No Source Analysis Available
Expected TMDL Completion Date:	2035
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Twenty lines of evidence are available in the administrative record to assess this pollutant. One hundred eighty-one of 293 samples exceed the cold freshwater habitat water quality objective (Basin Plan). One hundred twenty-nine of 177 samples exceed the water quality objective for fish spawning (Basin Plan). One hundred two of 293 samples exceed the water quality objective for warm freshwater habitat (Basin Plan). Note that there is no difference between samples fractions ‘dissolved’ and ‘total,’ therefore sample and exceedance counts will be summed for the purpose of this decision. Previous decisions (pre-2020) included dissolved oxygen saturation LOEs as ancillary evidence. This decision will no longer include dissolved oxygen saturation and these LOEs will be retired next cycle. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One hundred eighty-one of 293 samples exceed the cold freshwater habitat objective, 129 of 177 samples exceed the fish spawning objective, and 102 of 293 samples exceed the for warm freshwater habitat objective. These exceed the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) List because applicable water quality standards for the pollutant are being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	4020
Pollutant:	Low Dissolved Oxygen
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference:	Placeholder reference pre-2006 303(d)
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Unspecified
Objective/Criterion Reference:	Placeholder reference pre-2006 303(d)
Evaluation Guideline:	Unspecified
Guideline Reference:	Placeholder reference pre-2006 303(d)
Spatial Representation:	Unspecified
Temporal Representation:	Unspecified
Environmental Conditions:	Unspecified
QAPP Information:	Unspecified
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	175354
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Fish Spawning
Number of Samples:	32
Number of Exceedances:	3
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 3 of 32 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	47870
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	67
Number of Exceedances:	18
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 18 of 67 samples exceed the criterion for Oxygen, Dissolved.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	52663
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	3
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 3 of 8 samples exceed the criterion for Oxygen, Dissolved.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	48860
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	22
Number of Exceedances:	19
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 19 of 22 samples exceed the criterion for Oxygen, Dissolved.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	13418
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 2 of 8 samples exceed the criterion for Oxygen, Dissolved.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin, Cold Water Habitat Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	47871
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	67
Number of Exceedances:	5
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 5 of 67 samples exceed the criterion for Oxygen, Dissolved.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 5.0 mg/l at any time (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	52740
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for Oxygen, Dissolved.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 5.0 mg/l at any time (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	48865
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	22
Number of Exceedances:	12
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 12 of 22 samples exceed the criterion for Oxygen, Dissolved.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 5.0 mg/l at any time (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	14546
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	6
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 6 of 11 samples exceed the criterion for Oxygen, Dissolved.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin, General Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: For waters not mentioned by a specific beneficial use, dissolved oxygen concentration shall not be reduced below 5.0 mg/l at any time.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	13432
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for Oxygen, Dissolved.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin, General Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: For waters not mentioned by a specific beneficial use, dissolved oxygen concentration shall not be reduced below 5.0 mg/l at any time.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	175701
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Fish Spawning
Number of Samples:	69
Number of Exceedances:	63
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 63 of 69 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	175647
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	69
Number of Exceedances:	63
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 63 of 69 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	175139
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	69
Number of Exceedances:	34
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 34 of 69 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 5.0 mg/l at any time (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	175490
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	32
Number of Exceedances:	3
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 3 of 32 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	175365
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Fish Spawning
Number of Samples:	76
Number of Exceedances:	63
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 63 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-04-12 and 2015-02-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	175082
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	76
Number of Exceedances:	63
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 63 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-04-12 and 2015-02-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	174954
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	76
Number of Exceedances:	45
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 45 of 76 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 5.0 mg/l at any time (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-04-12 and 2015-02-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	175085
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	32
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality threshold for Oxygen, Dissolved.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The dissolved oxygen concentration shall not be reduced below 5.0 mg/l at any time (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109141, Oxygen, Dissolved Region 3      Warden Creek
LOE ID:	14545
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	10
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 10 of 11 samples exceed the criterion for Oxygen, Dissolved.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin, Cold Water Habitat Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: The dissolved oxygen concentration shall not be reduced below 7.0 mg/l at any time.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):

DECISION ID	128273	Region 3
Warden Creek

Pollutant:	Nitrate
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2018)
Revision Status	Revised
Sources:	Agriculture | Grazing-Related Sources
TMDL Name:	Los Osos Creek Nutrients
TMDL Project Code:	597
Date TMDL Approved by USEPA:	03/01/2005
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for removal on the CWA section 303(d) List under sections 2.2 and 4.1 of the Listing Policy. Under 4.1 of the Policy, a minimum of one line of evidence is needed to assess listing status. Twenty-nine lines of evidence are available in the administrative record to assess this pollutant. Lines of evidence for the pollutant name Nitrate and for the pollutant name Nitrogen, Nitrate are combined (same pollutant). Where the fraction is none, not recorded, or total, staff assumed that the fraction is dissolved, based on the analytical method. In these cases, sample and exceedance counts are summed for the purpose of making this decision. The Municipal and Domestic Supply beneficial use is not supported. A total of 125 of the 192 nitrate samples and 79 of the 105 nitrate/nitrite samples exceed this water quality objective. The Aquatic Life beneficial uses are not supported. Since the 2010 Integrated Report assessment cycle, Central Coast Water Board staff assessed nitrate data using an evaluation guideline (Central Coast Region Technical Report, 2010) used to interpret the narrative water quality objective for biostimulatory substances, set to protect Cold and Warm Freshwater Habitat beneficial uses. A total of 176 of the 183 nitrate samples and 90 of the 94 nitrate/nitrite samples exceed this evaluation guideline. In addition, and in accordance with section 4.11 of the Listing Policy, the following evidence supports the conclusion that nitrate contributes to or causes a bio-stimulatory response in this waterbody: This water segment is also on the 303(d) List for Low Dissolved Oxygen and visual observations of algal mats. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. There is sufficient justification to place it in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of 125 of the 192 nitrate samples and 79 of the 105 nitrate/nitrite samples exceed this water quality objective. In addition, 176 of the 183 nitrate samples and 90 of the 94 nitrate/nitrite samples exceed this evaluation guideline for nitrate and the protection of aquatic life uses from bio-stimulatory or eutrophic effects. These exceed the allowable frequency listed in Table 4.1 of the Listing Policy. Further and in accordance with section 4.11 of the Listing Policy, there is evidence that supports the conclusion that nitrate contributes to or causes a bio-stimulatory response in this waterbody. 4. The Los Osos Creek, Warden Creek, and Warden Lake Wetland TMDL for Nutrients was approved by USEPA in March of 2005. 5. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	149588
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Warden Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference:	CMP water quality data 10/17/2018--12/20/2018.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data were collected from 1 station. Station Code(s): 310WRP
Temporal Representation:	Data for this waterbody were collected on 2018-12-18
Environmental Conditions:
QAPP Information:	Data was collected verified in accordance with the Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program,
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	171934
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	63
Number of Exceedances:	51
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 51 of 63 samples exceeded the water quality threshold for Nitrate + Nitrite as N.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of inorganic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431 and 64433.2.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for nitrate + nitrite (as N) is 10. mg/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	171675
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	63
Number of Exceedances:	60
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 60 of 63 samples exceeded the water quality threshold for Nitrate + Nitrite as N.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	172164
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	73
Number of Exceedances:	72
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 72 of 73 samples exceeded the water quality threshold for Nitrate as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-03-29 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	172005
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	73
Number of Exceedances:	72
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 72 of 73 samples exceeded the water quality threshold for Nitrate as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-03-29 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	172858
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	29
Number of Exceedances:	29
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 29 of 29 samples exceeded the water quality threshold for Nitrate as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of inorganic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431 and 64433.2.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for nitrate (as N) 10.0 mg/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-25 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	172571
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	29
Number of Exceedances:	29
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 29 of 29 samples exceeded the water quality threshold for Nitrate as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-25 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	172607
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	29
Number of Exceedances:	29
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 29 of 29 samples exceeded the water quality threshold for Nitrate as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-25 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	172151
Pollutant:	Nitrogen, Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	73
Number of Exceedances:	69
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 69 of 73 samples exceeded the water quality threshold for Nitrate as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of inorganic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431 and 64433.2.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for nitrate (as N) 10.0 mg/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-03-29 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	52661
Pollutant:	Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	8
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 8 of 8 samples exceed the criterion for Nitrate as N.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Technical Approach to Develop Nutrient Numeric Endpoints for California. U.S. EPA Region IX. State Water Resources Control Board. 68-C-02-108-To-111
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	47856
Pollutant:	Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	68
Number of Exceedances:	63
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 63 of 68 samples exceed the criterion for Nitrate as N.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Technical Approach to Develop Nutrient Numeric Endpoints for California. U.S. EPA Region IX. State Water Resources Control Board. 68-C-02-108-To-111
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	Nitrate data was collected using a screening level test kit. Quality control is consistent with the QAPP.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	48918
Pollutant:	Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	4
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 4 of 5 samples exceed the criterion for Nitrate as N.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Technical Approach to Develop Nutrient Numeric Endpoints for California. U.S. EPA Region IX. State Water Resources Control Board. 68-C-02-108-To-111
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 12/17/2008-12/9/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	9975
Pollutant:	Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	9
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 2 of 9 samples exceed the criterion for Nitrate as N.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin Objective for municipal and domestic supply uses of inland surface waters (Section II.A.2) states the following: waters shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Article 4, Chapter 15, Section 64435, Tables 2 and 3 as listed in Table 3-2. The maximum contaminant level listed in Table 3-2 (inorganic and fluoride concentrations not to be exceeded in domestic or municipal supply) for nitrate is 10.0 mg/L (NO3 as N).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Objective/Criterion Reference:	Title 22, Division 4, Ch. 15, Article 4, Section 64431, Table 64431-A
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	47857
Pollutant:	Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	68
Number of Exceedances:	18
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 18 of 68 samples exceed the criterion for Nitrate as N.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Basin Plan is 10.0 mg/L (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	Nitrate data was collected using a screening level test kit. Quality control is consistent with the QAPP.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	48919
Pollutant:	Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	4
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 4 of 5 samples exceed the criterion for Nitrate as N.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Basin Plan is 10.0 mg/L (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 12/17/2008-12/9/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	52685
Pollutant:	Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	8
Number of Exceedances:	3
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 3 of 8 samples exceed the criterion for Nitrate as N.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The California Maximum Contaminant Level for nitrate (NO3 as N) incorporated by reference in the Basin Plan is 10.0 mg/L (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	52725
Pollutant:	Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	8
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 8 of 8 samples exceed the criterion for Nitrate as N.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Technical Approach to Develop Nutrient Numeric Endpoints for California. U.S. EPA Region IX. State Water Resources Control Board. 68-C-02-108-To-111
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	47869
Pollutant:	Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	68
Number of Exceedances:	63
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 63 of 68 samples exceed the criterion for Nitrate as N.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Technical Approach to Develop Nutrient Numeric Endpoints for California. U.S. EPA Region IX. State Water Resources Control Board. 68-C-02-108-To-111
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	Nitrate data was collected using a screening level test kit. Quality control is consistent with the QAPP.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	48856
Pollutant:	Nitrate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	4
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 4 of 5 samples exceed the criterion for Nitrate as N.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Technical Approach to Develop Nutrient Numeric Endpoints for California. U.S. EPA Region IX. State Water Resources Control Board. 68-C-02-108-To-111
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 12/17/2008-12/9/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	52662
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	8
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 8 of 8 samples exceed the criterion for Nitrate/Nitrite as N.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Technical Approach to Develop Nutrient Numeric Endpoints for California. U.S. EPA Region IX. State Water Resources Control Board. 68-C-02-108-To-111
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	48857
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	22
Number of Exceedances:	21
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 21 of 22 samples exceed the criterion for Nitrate/Nitrite as N.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Technical Approach to Develop Nutrient Numeric Endpoints for California. U.S. EPA Region IX. State Water Resources Control Board. 68-C-02-108-To-111
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	52701
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	8
Number of Exceedances:	4
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 4 of 8 samples exceed the criterion for Nitrate/Nitrite as N.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Basin Plan is 10.0 mg/L (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	48858
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	22
Number of Exceedances:	14
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 14 of 22 samples exceed the criterion for Nitrate/Nitrite as N.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The California Maximum Contaminant Level for nitrate + nitrite (as N) that is incorporated by reference in the Basin Plan is 10.0 mg/L (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	15335
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	11
Number of Exceedances:	9
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 9 of 11 samples exceed the criterion for Nitrate/Nitrite as N.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	OEHHA public Health Goals for Nitrate and Nitrogen in Drinking Water (December 1997). Page 6.
Objective/Criterion Reference:	Public health goals for nitrate and nitrite in drinking water
Evaluation Guideline:	OEHHA Public Health Goal states that sum of the concentration of nitrate + nitrite shall not exceed 10 mg/L (NO3+NO2 expressed as N).
Guideline Reference:	Public health goals for nitrate and nitrite in drinking water
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	52739
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	8
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 8 of 8 samples exceed the criterion for Nitrate/Nitrite as N.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Technical Approach to Develop Nutrient Numeric Endpoints for California. U.S. EPA Region IX. State Water Resources Control Board. 68-C-02-108-To-111
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	48859
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	22
Number of Exceedances:	21
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 21 of 22 samples exceed the criterion for Nitrate/Nitrite as N.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Technical Approach to Develop Nutrient Numeric Endpoints for California. U.S. EPA Region IX. State Water Resources Control Board. 68-C-02-108-To-111
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	149587
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Warden Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference:	CMP water quality data 10/17/2018--12/20/2018.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of inorganic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431 and 64433.2.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for nitrate + nitrite (as N) is 10. mg/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	Data were collected from 1 station. Station Code(s): 310WRP
Temporal Representation:	Data for this waterbody were collected on 2018-12-18
Environmental Conditions:
QAPP Information:	Data was collected verified in accordance with the Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program,
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	171431
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	63
Number of Exceedances:	60
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 60 of 63 samples exceeded the water quality threshold for Nitrate + Nitrite as N.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128273, Nitrate Region 3      Warden Creek
LOE ID:	149586
Pollutant:	Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Warden Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality standard for Nitrate + Nitrite as N.
Data Reference:	CMP water quality data 10/17/2018--12/20/2018.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Technical approach to develop nutrient numeric endpoints for California, Tetra Tech, June 2006. The Central Coast Region numeric target for maximum nitrate concentration is based on the Tetra Tech NNE (Nutrient Numeric Endpoint) Model and CCAMP data for 193 sites, monitored monthly for at least 1 year between January 1998 and December 2006. The model numeric target for aquatic life habitats in the Central Coast Region is 1.0 mg/L Nitrate as N.
Guideline Reference:	Central Coast RegionTechnical Paper: Interpreting Narrative Objectives for Biostimulatory Substances for California Central Coast Waters. This method uses the Technical Approach for Developing California Nutrient Numeric Endpoints.
Spatial Representation:	Data were collected from 1 station. Station Code(s): 310WRP
Temporal Representation:	Data for this waterbody were collected on 2018-12-18
Environmental Conditions:
QAPP Information:	Data was collected verified in accordance with the Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program,
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109133	Region 3
Warden Creek

Pollutant:	2,4,6-Trichlorophenol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109133, 2,4,6-Trichlorophenol Region 3      Warden Creek
LOE ID:	183430
Pollutant:	2,4,6-Trichlorophenol
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Trichlorophenol, 2,4,6-.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The 2, 4, 6-Trichlorophenol criteria for the protection of human health from the consumption of water and organisms is 2.1 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109136	Region 3
Warden Creek

Pollutant:	2,4-Dichlorophenol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109136, 2,4-Dichlorophenol Region 3      Warden Creek
LOE ID:	163854
Pollutant:	2,4-Dichlorophenol
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Dichlorophenol, 2,4-.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The 2, 4-Dichlorophenol criteria for the protection of human health from the consumption of water and organisms is 93 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109137	Region 3
Warden Creek

Pollutant:	2,4-Dimethylphenol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109137, 2,4-Dimethylphenol Region 3      Warden Creek
LOE ID:	164811
Pollutant:	2,4-Dimethylphenol
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Dimethylphenol, 2,4-.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The 2, 4-Dimethylphenol criteria for the protection of human health from the consumption of water and organisms is 540 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109139	Region 3
Warden Creek

Pollutant:	2,4-Dinitrophenol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109139, 2,4-Dinitrophenol Region 3      Warden Creek
LOE ID:	164933
Pollutant:	2,4-Dinitrophenol
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Dinitrophenol, 2,4-.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The 2, 4-Dinitrophenol criteria for the protection of human health from the consumption of water and organisms is 70 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109145	Region 3
Warden Creek

Pollutant:	2-Chlorophenol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109145, 2-Chlorophenol Region 3      Warden Creek
LOE ID:	160921
Pollutant:	2-Chlorophenol
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Chlorophenol, 2-.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The 2-Chlorophenol criteria for the protection of human health from the consumption of water and organisms is 120 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109163	Region 3
Warden Creek

Pollutant:	Aldicarb
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of two lines of evidence are available in the administrative record to assess this pollutant. A total of zero of two samples exceed the evaluation guideline for the cold freshwater habitat beneficial use and zero of two samples exceed the evaluation guideline for the warm freshwater habitat beneficial use. The readily available data and information are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of two samples exceed the evaluation guideline for the cold freshwater habitat beneficial use and zero of two samples exceed the evaluation guideline for the warm freshwater habitat beneficial use and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109163, Aldicarb Region 3      Warden Creek
LOE ID:	157294
Pollutant:	Aldicarb
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aldicarb.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109163, Aldicarb Region 3      Warden Creek
LOE ID:	157297
Pollutant:	Aldicarb
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Aldicarb.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	128095	Region 3
Warden Creek

Pollutant:	Ammonia
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Thirty lines of evidence (LOEs) are available in the administrative record to assess this pollutant. Sample and exceedance counts for the lines of evidence with the fraction identified as “none” or “not recorded” are grouped together with those having the fraction “total”, based on the analytical method used. The following is a summary of the sample and exceedances for each beneficial use: Based on LOEs summarizing un-ionized ammonia data, zero of the 129 samples exceed the water quality objective (Basin Plan) set to protect aquatic life. Based on LOEs summarizing total ammonia data (‘nitrogen, ammonia’ and ‘nitrogen as ammonia’) zero of the 72 samples exceed the EPA's Aquatic Life Ambient Water Quality Criteria set to protect aquatic life. Based on LOEs summarizing total ammonia data (‘nitrogen, ammonia’ and ‘nitrogen as ammonia’) zero of the 210 samples exceed the EPA's Lifetime Health advisory level set to protect municipal and domestic supply uses. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the samples exceed the water quality objectives and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	9989
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 7 samples exceed the criterion for Ammonia as N, Unionized.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter III, Section II.A.2 (General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/l (as N) in receiving waters (page III-4) .
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	184303
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	34
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-05-26 and 2018-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	183753
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	13
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-02-08 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	183634
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	73
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 73 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	EPA's Lifetime Health advisory level for total ammonia is 30.0 mg/L as stated on page 8 of the 2012 edition of the drinking water standards and health advisories. This Advisory Level is defined as 'the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for a lifetime of exposure.'
Guideline Reference:	2018 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-03-29 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	183848
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	25
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 25 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-05-09 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	183956
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	13
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-02-08 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	183648
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	31
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 31 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	EPA's Lifetime Health advisory level for total ammonia is 30.0 mg/L as stated on page 8 of the 2012 edition of the drinking water standards and health advisories. This Advisory Level is defined as 'the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for a lifetime of exposure.'
Guideline Reference:	2018 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	149583
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	CMP water quality data 10/17/2018--12/20/2018.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	EPA's Lifetime Health advisory level for total ammonia is 30.0 mg/L as stated on page 8 of the 2012 edition of the drinking water standards and health advisories. This Advisory Level is defined as "the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for a lifetime of exposure."
Guideline Reference:	2018 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	Data were collected from 1 station. Station Code(s): 310WRP
Temporal Representation:	Data for this waterbody were collected on 2018-12-18
Environmental Conditions:
QAPP Information:	Data was collected verified in accordance with the Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program,
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	183673
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	34
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 34 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-05-26 and 2018-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	183976
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	52
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 52 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	EPA's Lifetime Health advisory level for total ammonia is 30.0 mg/L as stated on page 8 of the 2012 edition of the drinking water standards and health advisories. This Advisory Level is defined as 'the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for a lifetime of exposure.'
Guideline Reference:	2018 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	183856
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	25
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 25 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-05-09 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	219564
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 31 samples were collected, 28 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter 3, Section 3.3.2 (Objectives for all Inland Surface Waters, Enclosed Bays, and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/L (as N) in receiving waters (page 32).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR).
Temporal Representation:	Data for this waterbody was collected over the date range 2011-01-11 to 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	219609
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	31
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 31 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 69 samples were collected, 38 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter 3, Section 3.3.2 (Objectives for all Inland Surface Waters, Enclosed Bays, and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/L (as N) in receiving waters (page 32).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP).
Temporal Representation:	Data for this waterbody was collected over the date range 2011-04-12 to 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	149585
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N, Unionized. 1 of these samples were estimates.
Data Reference:	CMP water quality data 10/17/2018--12/20/2018.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter 3, Section 3.3.2 (Objectives for all Inland Surface Waters, Enclosed Bays, and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/L (as N) in receiving waters (page 32).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data were collected from 1 station. Station Code(s): 310WRP
Temporal Representation:	Data for this waterbody were collected on 2018-12-18
Environmental Conditions:
QAPP Information:	Data was collected verified in accordance with the Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program,
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	219466
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	53
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 53 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 54 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter 3, Section 3.3.2 (Objectives for all Inland Surface Waters, Enclosed Bays, and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/L (as N) in receiving waters (page 32).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP).
Temporal Representation:	Data for this waterbody was collected over the date range 2010-04-28 to 2018-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	149584
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Surface Water Monitoring Project data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N, Unionized. 1 of these samples were estimates.
Data Reference:	CMP water quality data 10/17/2018--12/20/2018.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter 3, Section 3.3.2 (Objectives for all Inland Surface Waters, Enclosed Bays, and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/L (as N) in receiving waters (page 32).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data were collected from 1 station. Station Code(s): 310WRP
Temporal Representation:	Data for this waterbody were collected on 2018-12-18
Environmental Conditions:
QAPP Information:	Data was collected verified in accordance with the Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program,
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	219471
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	53
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 53 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 54 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter 3, Section 3.3.2 (Objectives for all Inland Surface Waters, Enclosed Bays, and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/L (as N) in receiving waters (page 32).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP).
Temporal Representation:	Data for this waterbody was collected over the date range 2010-04-28 to 2018-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	219614
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 31 samples were collected, 28 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter 3, Section 3.3.2 (Objectives for all Inland Surface Waters, Enclosed Bays, and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/L (as N) in receiving waters (page 32).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR).
Temporal Representation:	Data for this waterbody was collected over the date range 2011-01-11 to 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	219374
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	31
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 31 samples exceeded the water quality threshold for Ammonia as N, Unionized. Although a total of 69 samples were collected, 38 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter 3, Section 3.3.2 (Objectives for all Inland Surface Waters, Enclosed Bays, and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/L (as N) in receiving waters (page 32).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP).
Temporal Representation:	Data for this waterbody was collected over the date range 2011-04-12 to 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	15334
Pollutant:	Ammonia as Nitrogen
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for Ammonia As N, Total.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	USEPA Health Advisory 2006 Edition of the Drinking Water Standards and Health Advisories (EPA 822-R-06-013, 2006).
Objective/Criterion Reference:	2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013
Evaluation Guideline:	EPA's Lifetime Health advisory level for total ammonia is 30.0 mg/L as stated on page 8 of the 2006 edition of the drinking water standards and health advisories. This Advisory Level is defined as "the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for up to ten days of exposure."
Guideline Reference:	2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	9974
Pollutant:	Ammonia as Nitrogen
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	9
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 9 samples exceed the criterion for Ammonia as N, Total.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	USEPA Health Advisory 2006 Edition of the Drinking Water Standards and Health Advisories (EPA 822-R-06-013, 2006).
Objective/Criterion Reference:	2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013
Evaluation Guideline:	EPA's Lifetime Health advisory level for total ammonia is 30.0 mg/L as stated on page 8 of the 2006 edition of the drinking water standards and health advisories. This Advisory Level is defined as "the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for up to ten days of exposure."
Guideline Reference:	2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	48903
Pollutant:	Ammonia as Nitrogen
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	25
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 25 samples exceed the criterion for Ammonia As N, Total.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	EPA's Lifetime Health advisory level for total ammonia is 30.0 mg/L as stated on page 8 of the 2006 edition of the drinking water standards and health advisories. This Advisory Level is defined as "the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for up to ten days of exposure."
Guideline Reference:	2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-6/30/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	52683
Pollutant:	Ammonia as Nitrogen
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for Ammonia As N, Total.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:	EPA's Lifetime Health advisory level for total ammonia is 30.0 mg/L as stated on page 8 of the 2006 edition of the drinking water standards and health advisories. This Advisory Level is defined as "the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for up to ten days of exposure."
Guideline Reference:	2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	52803
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 7 samples exceed the criterion for Ammonia as N, Unionized.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter III, Section II.A.2 (General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/l (as N) in receiving waters (page III-4) .
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	9988
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 7 samples exceed the criterion for Ammonia as N, Unionized.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter III, Section II.A.2 (General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/l (as N) in receiving waters (page III-4) .
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	48904
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	16
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 16 samples exceed the criterion for Ammonia as N, Unionized.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter III, Section II.A.2 (General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/l (as N) in receiving waters (page III-4) .
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 5/30/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	52723
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 7 samples exceed the criterion for Ammonia as N, Unionized.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter III, Section II.A.2 (General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/l (as N) in receiving waters (page III-4).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	14601
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for Ammonia as N, Unionized.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter III, Section II.A.2 (General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/l (as N) in receiving waters (page III-4) .
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	48905
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	16
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 16 samples exceed the criterion for Ammonia as N, Unionized.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter III, Section II.A.2 (General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/l (as N) in receiving waters (page III-4).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 5/30/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 128095, Ammonia Region 3      Warden Creek
LOE ID:	14602
Pollutant:	Ammonia (Unionized)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for Ammonia as N, Unionized.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin General Objective, Chapter III, Section II.A.2 (General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries) states that the discharge of wastes shall not cause concentrations of unionized ammonia (NH3) to exceed 0.025 mg/l (as N) in receiving waters (page III-4) .
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):

DECISION ID	109111	Region 3
Warden Creek

Pollutant:	Arsenic
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. A total of four lines of evidence are available in the administrative record to assess this pollutant. A total of zero of one sample exceeds the water quality objective for the cold freshwater habitat beneficial use, zero of one sample exceeds the dissolved fraction evaluation guideline and zero of five samples exceed the total fraction evaluation guideline for the municipal and domestic supply beneficial use and zero of one sample exceeds the water quality objective for the warm freshwater habitat beneficial use. These data are insufficient to determine the applicable beneficial use support rating with the power and confidence required by the Listing Policy. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of one sample exceeds the water quality objective for the cold freshwater habitat beneficial use, zero of one sample exceeds the dissolved fraction evaluation guideline and zero of five samples exceed the total fraction evaluation guideline for the municipal and domestic supply beneficial use and zero of one sample exceeds the water quality objective for the warm freshwater habitat beneficial use. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109111, Arsenic Region 3      Warden Creek
LOE ID:	158350
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The criterion continuous concentration for dissolved arsenic in freshwater is 0.150 mg/L. (California Toxics Rule, 2000)
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2018-01-10 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109111, Arsenic Region 3      Warden Creek
LOE ID:	158244
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Arsenic.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for Arsenic is 10 ug/L.
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109111, Arsenic Region 3      Warden Creek
LOE ID:	158285
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The criterion continuous concentration for dissolved arsenic in freshwater is 0.150 mg/L. (California Toxics Rule, 2000)
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2018-01-10 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109111, Arsenic Region 3      Warden Creek
LOE ID:	158421
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for Arsenic is 10 ug/L.
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2018-01-10 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109112	Region 3
Warden Creek

Pollutant:	Atrazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of three lines of evidence are available in the administrative record to assess this pollutant. A total of zero of four samples exceed the evaluation guideline for the cold freshwater habitat beneficial use; zero of four samples exceed the evaluation guideline for the municipal and domestic supply beneficial use; and zero of four samples exceed the evaluation guideline for the warm freshwater habitat beneficial use. The readily available data and information are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of four samples exceed the evaluation guideline for the cold freshwater habitat beneficial use, zero of four samples exceed the evaluation guideline for the municipal and domestic supply beneficial use, and zero of four samples exceed the evaluation guideline for the warm freshwater habitat beneficial use and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109112, Atrazine Region 3      Warden Creek
LOE ID:	158545
Pollutant:	Atrazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Atrazine.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of inorganic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431 and 64433.2.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for Atrazine is 1 ug/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109112, Atrazine Region 3      Warden Creek
LOE ID:	158771
Pollutant:	Atrazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Atrazine.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of <1 ug/L for a nonvascular plant (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109112, Atrazine Region 3      Warden Creek
LOE ID:	158544
Pollutant:	Atrazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Atrazine.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of <1 ug/L for a nonvascular plant (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109128	Region 3
Warden Creek

Pollutant:	Azinphos-methyl (Guthion)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109128, Azinphos-methyl (Guthion) Region 3      Warden Creek
LOE ID:	158527
Pollutant:	Azinphos-methyl (Guthion)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the water quality threshold for Azinphos Methyl. Although a total of 4 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The Criterion Continuous Concentration for freshwater aquatic life is 0.01 ug/L (National Recommended Water Quality Criteria, EPA 2016)
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP).
Temporal Representation:	Data for this waterbody was collected over the date range 2013-03-26 to 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109128, Azinphos-methyl (Guthion) Region 3      Warden Creek
LOE ID:	158638
Pollutant:	Azinphos-methyl (Guthion)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the water quality threshold for Azinphos Methyl. Although a total of 4 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The Criterion Continuous Concentration for freshwater aquatic life is 0.01 ug/L (National Recommended Water Quality Criteria, EPA 2016)
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP).
Temporal Representation:	Data for this waterbody was collected over the date range 2013-03-26 to 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109156	Region 3
Warden Creek

Pollutant:	Bifenthrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 and 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment. The pollutant concentration in sediment must be associated with toxicity to result in addition of the pollutant to the Section 303(d) List. Two line of evidence is available in the administrative record to assess this pollutant. Zero of the two sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses. A minimum of 16 samples is needed to determine if a beneficial use is supported and a minimum of two exceedances is needed to determine if beneficial uses are not supported using table 3.1 of the Listing Policy. Therefore, the use support rating is set to 'insufficient information'. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the two sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109156, Bifenthrin Region 3      Warden Creek
LOE ID:	151199
Pollutant:	Bifenthrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Bifenthrin .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for bifenthrin is the median lethal concentration (LC50) of 0.43 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.43 ug/g is the geometric mean of LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Guideline Reference:	Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109156, Bifenthrin Region 3      Warden Creek
LOE ID:	151443
Pollutant:	Bifenthrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Bifenthrin .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for bifenthrin is the median lethal concentration (LC50) of 0.43 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.43 ug/g is the geometric mean of LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Guideline Reference:	Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109113	Region 3
Warden Creek

Pollutant:	Cadmium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109113, Cadmium Region 3      Warden Creek
LOE ID:	159328
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for cadmium is 0.005 mg/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-05-30 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109113, Cadmium Region 3      Warden Creek
LOE ID:	159322
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109113, Cadmium Region 3      Warden Creek
LOE ID:	159280
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for cadmium is 0.005 mg/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109113, Cadmium Region 3      Warden Creek
LOE ID:	159359
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109114	Region 3
Warden Creek

Pollutant:	Carbaryl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109114, Carbaryl Region 3      Warden Creek
LOE ID:	160025
Pollutant:	Carbaryl
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Carbaryl.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The Criterion Continuous Concentration for freshwater aquatic life is 2.1 ug/L (National Recommended Water Quality Criteria, EPA 2016)
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109114, Carbaryl Region 3      Warden Creek
LOE ID:	160249
Pollutant:	Carbaryl
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Carbaryl.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The Criterion Continuous Concentration for freshwater aquatic life is 2.1 ug/L (National Recommended Water Quality Criteria, EPA 2016)
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109114, Carbaryl Region 3      Warden Creek
LOE ID:	160050
Pollutant:	Carbaryl
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Carbaryl.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The USEPA drinking water health advisory for carbaryl is 40 ug/L.
Guideline Reference:	2018 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109115	Region 3
Warden Creek

Pollutant:	Carbofuran
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109115, Carbofuran Region 3      Warden Creek
LOE ID:	160439
Pollutant:	Carbofuran
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Carbofuran.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Carbofuran is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertibrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109115, Carbofuran Region 3      Warden Creek
LOE ID:	160554
Pollutant:	Carbofuran
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Carbofuran.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Carbofuran is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertibrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109115, Carbofuran Region 3      Warden Creek
LOE ID:	160533
Pollutant:	Carbofuran
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Carbofuran.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of organic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 5.5, Section 64444, Table 64444-A.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for Carbofuran is 0.018 mg/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109116	Region 3
Warden Creek

Pollutant:	Chlordane
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109116, Chlordane Region 3      Warden Creek
LOE ID:	151865
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Chlordane .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Chlordane from MacDonald et al., 2000a which states that the probable effect concentration for Chlordane is 17.6 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109116, Chlordane Region 3      Warden Creek
LOE ID:	151518
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Chlordane .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Chlordane from MacDonald et al., 2000a which states that the probable effect concentration for Chlordane is 17.6 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109118	Region 3
Warden Creek

Pollutant:	Chlorpyrifos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 and 3.6 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment. The pollutant concentration in sediment must be associated with toxicity to result in addition of the pollutant to the Section 303(d) List. Six lines of evidence are available in the administrative record to assess this pollutant. Note, two LOEs (47692 and 47714) summarize data from sediment pore water and the evaluation guideline is not relevant for this matrix. Therefore those LOEs were removed from and are not included in this decision. Zero out of six water samples exceeded the aquatic life evaluation guideline (Siepmann and Finlayson 2000, with minor corrections to significant figures as described in Beaulaurier et al., 2005). For lines of evidence where the fraction is none staff assumed that the fraction is total, based on the analytical method, and the sample and exceedance counts are summed for both fractions for the purpose of making this decision. Zero out of two sediment samples exceeded the aquatic life evaluation guideline (Amweg and Weston, 2007). These sample sizes are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is supported using table 3.1. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List because applicable water quality standards are not being exceeded. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of six water samples and zero of two sediment samples exceeded the water quality objectives. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 109118, Chlorpyrifos Region 3      Warden Creek
LOE ID:	161869
Pollutant:	Chlorpyrifos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Chlorpyrifos.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The freshwater criterion continuous concentration to protect aquatic organisms is 0.015 ug/L (Siepmann and Finlayson 2000, with minor corrections to significant figures as described in Beaulaurier et al., 2005).
Guideline Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game
Guideline Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game (with minor corrections to significant figures as described in Beaulaurier et al., 2005).
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109118, Chlorpyrifos Region 3      Warden Creek
LOE ID:	151913
Pollutant:	Chlorpyrifos
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Chlorpyrifos .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for chlorpyrifos is the median lethal concentration (LC50) of 1.77 ug/g and is normalized by the percentage of organic carbon in the sediment sample (Amweg and Weston, 2007).
Guideline Reference:	Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109118, Chlorpyrifos Region 3      Warden Creek
LOE ID:	161757
Pollutant:	Chlorpyrifos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Chlorpyrifos.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The freshwater criterion continuous concentration to protect aquatic organisms is 0.015 ug/L (Siepmann and Finlayson 2000, with minor corrections to significant figures as described in Beaulaurier et al., 2005).
Guideline Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game
Guideline Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game (with minor corrections to significant figures as described in Beaulaurier et al., 2005).
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109118, Chlorpyrifos Region 3      Warden Creek
LOE ID:	16261
Pollutant:	Chlorpyrifos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP_SWAMP Monitoring (00SW3001) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chlorpyrifos.
Data Reference:	Final Data File used for assessment: SWAMP Toxicity Data 2001-06
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Objective/Criterion Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game
Evaluation Guideline:	One hour average maximum concentration 0.025 ug/L as stated in Sipmann and Finlayson (2000).
Guideline Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected on a single day 3/27/2002. SWAMP toxicity monitoring includes both water samples (collected in both winter and summer) and sediment samples (collected in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109118, Chlorpyrifos Region 3      Warden Creek
LOE ID:	16260
Pollutant:	Chlorpyrifos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP_SWAMP Monitoring (00SW3001) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chlorpyrifos.
Data Reference:	Final Data File used for assessment: SWAMP Toxicity Data 2001-06
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Objective/Criterion Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game
Evaluation Guideline:	One hour average maximum concentration 0.025 ug/L as stated in Sipmann and Finlayson (2000).
Guideline Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected on a single day 3/27/2002. SWAMP toxicity monitoring includes both water samples (collected in both winter and summer) and sediment samples (collected in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109118, Chlorpyrifos Region 3      Warden Creek
LOE ID:	151915
Pollutant:	Chlorpyrifos
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Chlorpyrifos .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for chlorpyrifos is the median lethal concentration (LC50) of 1.77 ug/g and is normalized by the percentage of organic carbon in the sediment sample (Amweg and Weston, 2007).
Guideline Reference:	Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109119	Region 3
Warden Creek

Pollutant:	Copper
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of four lines of evidence are available in the administrative record to assess this pollutant. A total of zero of five samples exceed the water quality objective for the cold freshwater habitat beneficial use, zero of five samples exceed the dissolved fraction water quality objective and zero of four samples exceed the total fraction water quality objective for the municipal and domestic supply beneficial use and zero of five samples exceed the water quality objective for the warm freshwater habitat beneficial use. These data are insufficient to determine the applicable beneficial use support rating with the power and confidence required by the Listing Policy. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of five samples exceed the water quality objective for the cold freshwater habitat beneficial use, zero of five samples exceed the dissolved fraction water quality objective and zero of four samples exceed the total fraction water quality objective for the municipal and domestic supply beneficial use and zero of five samples exceed the water quality objective for the warm freshwater habitat beneficial use. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109119, Copper Region 3      Warden Creek
LOE ID:	162736
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Copper.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109119, Copper Region 3      Warden Creek
LOE ID:	162605
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Copper.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Copper criteria for the protection of human health from the consumption of water and organisms is 1.300 mg/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109119, Copper Region 3      Warden Creek
LOE ID:	162674
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Copper.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109119, Copper Region 3      Warden Creek
LOE ID:	163037
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Copper.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Copper criteria for the protection of human health from the consumption of water and organisms is 1.300 mg/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109160	Region 3
Warden Creek

Pollutant:	Cyanazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109160, Cyanazine Region 3      Warden Creek
LOE ID:	163384
Pollutant:	Cyanazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Cyanazine.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for cyanazine is the EC50 of 4.8 ug/L for Navicula pelliculosa (freshwater diatom) (USEPA Office of Pesticide Programs Ecotoxicity database).
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109160, Cyanazine Region 3      Warden Creek
LOE ID:	163442
Pollutant:	Cyanazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Cyanazine.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for cyanazine is the EC50 of 4.8 ug/L for Navicula pelliculosa (freshwater diatom) (USEPA Office of Pesticide Programs Ecotoxicity database).
Guideline Reference:	OPP Pesticide Ecotoxicity Database.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109166	Region 3
Warden Creek

Pollutant:	Cyfluthrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 and 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment. The pollutant concentration in sediment must be associated with toxicity to result in addition of the pollutant to the Section 303(d) List. Two line of evidence is available in the administrative record to assess this pollutant. Zero of the two sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses. A minimum of 16 samples is needed to determine if a beneficial use is supported and a minimum of two exceedances is needed to determine if beneficial uses are not supported using table 3.1 of the Listing Policy. Therefore, the use support rating is set to 'insufficient information'. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the two sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109166, Cyfluthrin Region 3      Warden Creek
LOE ID:	152242
Pollutant:	Cyfluthrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Cyfluthrin, total .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for cyfluthrin is the median lethal concentration (LC50) of 1.1 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.1 ug/g is the geometric mean of LC50 values for cyfluthrin from Amweg et al. (2005).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109166, Cyfluthrin Region 3      Warden Creek
LOE ID:	152180
Pollutant:	Cyfluthrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Cyfluthrin, total .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for cyfluthrin is the median lethal concentration (LC50) of 1.1 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.1 ug/g is the geometric mean of LC50 values for cyfluthrin from Amweg et al. (2005).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109168	Region 3
Warden Creek

Pollutant:	Cyhalothrin, Lambda
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 and 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment. The pollutant concentration in sediment must be associated with toxicity to result in addition of the pollutant to the Section 303(d) List. Two line of evidence is available in the administrative record to assess this pollutant. Zero of the two sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses. A minimum of 16 samples is needed to determine if a beneficial use is supported and a minimum of two exceedances is needed to determine if beneficial uses are not supported using table 3.1 of the Listing Policy. Therefore, the use support rating is set to 'insufficient information'. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the two sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109168, Cyhalothrin, Lambda Region 3      Warden Creek
LOE ID:	152651
Pollutant:	Cyhalothrin, Lambda
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Cyhalothrin, Total lambda- .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for lambda-cyhalothrin is the median lethal concentration (LC50) of 0.44 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.44 ug/g is the geometric mean of LC50 values for lambda-cyhalothrin from Amweg et al. (2005).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109168, Cyhalothrin, Lambda Region 3      Warden Creek
LOE ID:	152485
Pollutant:	Cyhalothrin, Lambda
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Cyhalothrin, Total lambda- .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for lambda-cyhalothrin is the median lethal concentration (LC50) of 0.44 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.44 ug/g is the geometric mean of LC50 values for lambda-cyhalothrin from Amweg et al. (2005).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109157	Region 3
Warden Creek

Pollutant:	Cypermethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 and 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment. The pollutant concentration in sediment must be associated with toxicity to result in addition of the pollutant to the Section 303(d) List. Two line of evidence is available in the administrative record to assess this pollutant. Zero of the two sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses. A minimum of 16 samples is needed to determine if a beneficial use is supported and a minimum of two exceedances is needed to determine if beneficial uses are not supported using table 3.1 of the Listing Policy. Therefore, the use support rating is set to 'insufficient information'. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the two sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109157, Cypermethrin Region 3      Warden Creek
LOE ID:	152992
Pollutant:	Cypermethrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Cypermethrin, Total .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for cypermethrin is the median lethal concentration (LC50) of 0.3 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.3 ug/g is the geometric mean of LC50 values for cypermethrin from Maund et al. (2002).
Guideline Reference:	Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2013-05-30
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109157, Cypermethrin Region 3      Warden Creek
LOE ID:	152897
Pollutant:	Cypermethrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Cypermethrin, Total .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for cypermethrin is the median lethal concentration (LC50) of 0.3 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.3 ug/g is the geometric mean of LC50 values for cypermethrin from Maund et al. (2002).
Guideline Reference:	Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2013-05-30
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	130084	Region 3
Warden Creek

Pollutant:	DDD (Dichlorodiphenyldichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under section 3.1 and 3.6 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment. The pollutant concentration in sediment must be associated with toxicity to result in addition of the pollutant to the 303(d) List. Two lines of evidence are available in the administrative record to assess this pollutant. Two LOEs summarize sediment samples. Zero of one sediment sample exceeds the DDD evaluation guideline (MacDonald et al., 2000a) set to protect for aquatic life beneficial uses. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. No sediment samples exceeded the evaluation guidelines set to protect aquatic life beneficial uses and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 130084, DDD (Dichlorodiphenyldichloroethane) Region 3      Warden Creek
LOE ID:	152747
Pollutant:	DDD (Dichlorodiphenyldichloroethane)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for DDD (Dichlorodiphenyldichloroethane) .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Sum DDD from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDD is 28 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 130084, DDD (Dichlorodiphenyldichloroethane) Region 3      Warden Creek
LOE ID:	152704
Pollutant:	DDD (Dichlorodiphenyldichloroethane)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for DDD (Dichlorodiphenyldichloroethane) .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Sum DDD from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDD is 28 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	130172	Region 3
Warden Creek

Pollutant:	DDE (Dichlorodiphenyldichloroethylene)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under section 3.1 and section 3.6 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment. The pollutant concentration in sediment must be associated with toxicity to result in addition of the pollutant to the 303(d) List. Two lines of evidence are available in the administrative record to assess this pollutant. Two LOEs summarize sediment samples. One of one sediment sample exceeds the DDE evaluation guideline (MacDonald et al., 2000a) set to protect for aquatic life beneficial uses. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of one sediment sample exceeded the evaluation guidelines, and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 130172, DDE (Dichlorodiphenyldichloroethylene) Region 3      Warden Creek
LOE ID:	153246
Pollutant:	DDE (Dichlorodiphenyldichloroethylene)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the evaluation guideline for DDE (Dichlorodiphenyldichloroethylene) .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Sum DDE from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDE is 31.3 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 130172, DDE (Dichlorodiphenyldichloroethylene) Region 3      Warden Creek
LOE ID:	153241
Pollutant:	DDE (Dichlorodiphenyldichloroethylene)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the evaluation guideline for DDE (Dichlorodiphenyldichloroethylene) .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Sum DDE from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDE is 31.3 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	129994	Region 3
Warden Creek

Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under section 3.1 and 3.6 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment. The pollutant concentration in sediment must be associated with toxicity to result in addition of the pollutant to the 303(d) List. Four lines of evidence are available in the administrative record to assess this pollutant. Note that this decision combines the pollutant ‘DDT’ and ‘total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD).’ Four LOEs summarize sediment samples. Zero of one sediment sample exceeds the DDT evaluation guideline (MacDonald et al., 2000a) set to protect for aquatic life beneficial uses. Zero of one sediment sample exceeds the total DDT evaluation guideline (MacDonald et al., 2000a) set to protect for aquatic life beneficial uses. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. No sediment samples exceeded the evaluation guidelines set to protect aquatic life beneficial uses and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 129994, DDT (Dichlorodiphenyltrichloroethane) Region 3      Warden Creek
LOE ID:	156007
Pollutant:	Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Total DDTs from MacDonald et al., 2000a which states that the probable effect concentration for Total DDTs is 572 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 129994, DDT (Dichlorodiphenyltrichloroethane) Region 3      Warden Creek
LOE ID:	156010
Pollutant:	Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Total DDTs from MacDonald et al., 2000a which states that the probable effect concentration for Total DDTs is 572 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 129994, DDT (Dichlorodiphenyltrichloroethane) Region 3      Warden Creek
LOE ID:	153328
Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for DDT (Dichlorodiphenyltrichloroethane) .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Sum DDT from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDT is 62.9 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 129994, DDT (Dichlorodiphenyltrichloroethane) Region 3      Warden Creek
LOE ID:	153287
Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for DDT (Dichlorodiphenyltrichloroethane) .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Sum DDT from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDT is 62.9 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109167	Region 3
Warden Creek

Pollutant:	Deltamethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109167, Deltamethrin Region 3      Warden Creek
LOE ID:	153444
Pollutant:	Deltamethrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Deltamethrin .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for deltamethrin is the median lethal concentration (LC50) of 0.79 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.79 ug/g is the geometric mean of LC50 values for deltamethrin from Amweg et al. (2005).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109167, Deltamethrin Region 3      Warden Creek
LOE ID:	153603
Pollutant:	Deltamethrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Deltamethrin .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for deltamethrin is the median lethal concentration (LC50) of 0.79 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.79 ug/g is the geometric mean of LC50 values for deltamethrin from Amweg et al. (2005).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109120	Region 3
Warden Creek

Pollutant:	Diazinon
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Note, two LOEs 47734 and 47689) summarize data from sediment pore water and the evaluation guideline is not relevant for this matrix. Therefore those LOEs were removed from and are not included in this decision. Zero of five water samples exceeded the aquatic life evaluation guideline (Finlayson, 2004). This sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is supported using table 3.1. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List because applicable water quality standards are not being exceeded. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero samples exceeded the water quality objectives. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 109120, Diazinon Region 3      Warden Creek
LOE ID:	164158
Pollutant:	Diazinon
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Diazinon.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).
Guideline Reference:	Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109120, Diazinon Region 3      Warden Creek
LOE ID:	164180
Pollutant:	Diazinon
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Diazinon.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The freshwater chronic value for diazinon is 0.1 ug/L, expressed as a continuous concentration (Finlayson, 2004).
Guideline Reference:	Water quality for diazinon. Memorandum to J. Karkoski, Central Valley RWQCB. Rancho Cordova, CA: Pesticide Investigation Unit, CA Department of Fish and Game
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109120, Diazinon Region 3      Warden Creek
LOE ID:	16635
Pollutant:	Diazinon
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP_SWAMP Monitoring (00SW3001) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Diazinon.
Data Reference:	Final Data File used for assessment: SWAMP Toxicity Data 2001-06
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Objective/Criterion Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game
Evaluation Guideline:	One hour average maximum concentration 0.16 ug/L as stated in Sipmann and Finlayson (2000).
Guideline Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected on a single day 3/27/2002. SWAMP toxicity monitoring includes both water samples (collected in both winter and summer) and sediment samples (collected in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109120, Diazinon Region 3      Warden Creek
LOE ID:	16634
Pollutant:	Diazinon
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP_SWAMP Monitoring (00SW3001) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Diazinon.
Data Reference:	Final Data File used for assessment: SWAMP Toxicity Data 2001-06
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Objective/Criterion Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game
Evaluation Guideline:	One hour average maximum concentration 0.16 ug/L as stated in Sipmann and Finlayson (2000).
Guideline Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected on a single day 3/27/2002. SWAMP toxicity monitoring includes both water samples (collected in both winter and summer) and sediment samples (collected in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):

DECISION ID	109121	Region 3
Warden Creek

Pollutant:	Dichlorvos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1, and single line of evidence are necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Zero of zero water samples exceed the evaluation guideline applied to protect aquatic life beneficial uses. In this case, some samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Zero of five water samples exceed the drinking water advisory level for municipal and domestic water supply. A minimum of 16 samples is needed to determine if a beneficial use is supported and a minimum of two exceedances is needed to determine if beneficial uses are not supported using table 3.1. Therefore, the applicable use support ratings are “insufficient information”. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero samples exceed the evaluation guidelines. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109121, Dichlorvos Region 3      Warden Creek
LOE ID:	164317
Pollutant:	Dichlorvos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Dichlorvos.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The USEPA IRIS one-in-a-million cancer risk estimate from oral exposure for dichlorvos is 0.1 ug/L.
Guideline Reference:	IRIS Database Calculations (summary)
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109121, Dichlorvos Region 3      Warden Creek
LOE ID:	164516
Pollutant:	Dichlorvos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorvos. Although a total of 5 samples were collected, 5 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP).
Temporal Representation:	Date for this waterbody was collected over the date range 2013-03-26 to 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109121, Dichlorvos Region 3      Warden Creek
LOE ID:	164257
Pollutant:	Dichlorvos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorvos. Although a total of 5 samples were collected, 5 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP).
Temporal Representation:	Date for this waterbody was collected over the date range 2013-03-26 to 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109122	Region 3
Warden Creek

Pollutant:	Dieldrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109122, Dieldrin Region 3      Warden Creek
LOE ID:	153419
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Dieldrin .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Dieldrin from MacDonald et al., 2000a which states that the probable effect concentration for Dieldrin is 61.8 ug/kg dw. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109122, Dieldrin Region 3      Warden Creek
LOE ID:	153611
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Dieldrin .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Dieldrin from MacDonald et al., 2000a which states that the probable effect concentration for Dieldrin is 61.8 ug/kg dw. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109159	Region 3
Warden Creek

Pollutant:	Dimethoate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of four water samples exceeded the USEPA aquatic life evaluation guideline. This sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is supported using table 3.1. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List because applicable water quality standards are not being exceeded. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero samples exceed the evaluation guidelines. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109159, Dimethoate Region 3      Warden Creek
LOE ID:	164800
Pollutant:	Dimethoate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Dimethoate.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109159, Dimethoate Region 3      Warden Creek
LOE ID:	164627
Pollutant:	Dimethoate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Dimethoate.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109123	Region 3
Warden Creek

Pollutant:	Dinitro-o-cresol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109123, Dinitro-o-cresol Region 3      Warden Creek
LOE ID:	165076
Pollutant:	Dinitro-o-cresol
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Dinitro-2-methylphenol, 4,6-.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The 2-Methyl-4, 6-dinitrophenol criteria for the protection of human health from the consumption of water and organisms is 13.4 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109124	Region 3
Warden Creek

Pollutant:	Disulfoton
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109124, Disulfoton Region 3      Warden Creek
LOE ID:	165230
Pollutant:	Disulfoton
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Disulfoton.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109124, Disulfoton Region 3      Warden Creek
LOE ID:	164888
Pollutant:	Disulfoton
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Disulfoton.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The USEPA drinking water health advisory for disulfoton is 0.7 ug/L.
Guideline Reference:	2018 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109124, Disulfoton Region 3      Warden Creek
LOE ID:	165209
Pollutant:	Disulfoton
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Disulfoton.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109125	Region 3
Warden Creek

Pollutant:	Diuron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109125, Diuron Region 3      Warden Creek
LOE ID:	165394
Pollutant:	Diuron
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Diuron.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Aquatic life should not be affected unacceptably if the 4-day average concentration of Diuron, 1.3 ug/L, is not exceeded more than once every three years on the average (Fojut et al., 2010).
Guideline Reference:	Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109125, Diuron Region 3      Warden Creek
LOE ID:	165280
Pollutant:	Diuron
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Diuron.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Aquatic life should not be affected unacceptably if the 4-day average concentration of Diuron, 1.3 ug/L, is not exceeded more than once every three years on the average (Fojut et al., 2010).
Guideline Reference:	Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109125, Diuron Region 3      Warden Creek
LOE ID:	165515
Pollutant:	Diuron
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Diuron.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The USEPA health advisory for one-in-a-million incremental cancer risk estimate calculated as a drinking water standard for diuron is 2 ug/L.
Guideline Reference:	2018 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109126	Region 3
Warden Creek

Pollutant:	Endrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109126, Endrin Region 3      Warden Creek
LOE ID:	153938
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Endrin .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Endrin from MacDonald et al., 2000a which states that the probable effect concentration for Endrin is 207 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109126, Endrin Region 3      Warden Creek
LOE ID:	153891
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Endrin .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Endrin from MacDonald et al., 2000a which states that the probable effect concentration for Endrin is 207 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109170	Region 3
Warden Creek

Pollutant:	Esfenvalerate/Fenvalerate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109170, Esfenvalerate/Fenvalerate Region 3      Warden Creek
LOE ID:	154124
Pollutant:	Esfenvalerate/Fenvalerate
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Esfenvalerate/Fenvalerate, Total .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for esfenvalerate/fenvalerate is the median lethal concentration (LC50) of 1.5 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.5 ug/g is the geometric mean of LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109170, Esfenvalerate/Fenvalerate Region 3      Warden Creek
LOE ID:	154048
Pollutant:	Esfenvalerate/Fenvalerate
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Esfenvalerate/Fenvalerate, Total .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for esfenvalerate/fenvalerate is the median lethal concentration (LC50) of 1.5 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.5 ug/g is the geometric mean of LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109161	Region 3
Warden Creek

Pollutant:	Ethoprop
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of two lines of evidence are available in the administrative record to assess this pollutant. A total of zero of three samples exceed the water quality objective for the cold freshwater habitat beneficial use and zero of three samples exceed the evaluation guideline for the warm freshwater habitat beneficial use. These data are insufficient to determine the applicable beneficial use support rating with the power and confidence required by the Listing Policy. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of three samples exceed the water quality objective for the cold freshwater habitat beneficial use and zero of three samples exceed the evaluation guideline for the warm freshwater habitat beneficial use. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109161, Ethoprop Region 3      Warden Creek
LOE ID:	165944
Pollutant:	Ethoprop
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ethoprop.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109161, Ethoprop Region 3      Warden Creek
LOE ID:	165948
Pollutant:	Ethoprop
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ethoprop.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109169	Region 3
Warden Creek

Pollutant:	Fenpropathrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 and 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment. The pollutant concentration in sediment must be associated with toxicity to result in addition of the pollutant to the Section 303(d) List. Two line of evidence is available in the administrative record to assess this pollutant. Zero of the two sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses. A minimum of 16 samples is needed to determine if a beneficial use is supported and a minimum of two exceedances is needed to determine if beneficial uses are not supported using table 3.1 of the Listing Policy. Therefore, the use support rating is set to 'insufficient information'. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the two sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109169, Fenpropathrin Region 3      Warden Creek
LOE ID:	154024
Pollutant:	Fenpropathrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Fenpropathrin .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for fenpropathrin is the median lethal concentration (LC50) of 1 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1 ug/g is the geometric mean of LC50 values for fenpropathrin from Ding et al. ( 2011).
Guideline Reference:	Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109169, Fenpropathrin Region 3      Warden Creek
LOE ID:	154095
Pollutant:	Fenpropathrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Fenpropathrin .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for fenpropathrin is the median lethal concentration (LC50) of 1 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1 ug/g is the geometric mean of LC50 values for fenpropathrin from Ding et al. ( 2011).
Guideline Reference:	Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109164	Region 3
Warden Creek

Pollutant:	Fenthion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109164, Fenthion Region 3      Warden Creek
LOE ID:	166649
Pollutant:	Fenthion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Fenthion.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109164, Fenthion Region 3      Warden Creek
LOE ID:	166510
Pollutant:	Fenthion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Fenthion.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109127	Region 3
Warden Creek

Pollutant:	Glyphosate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of three lines of evidence are available in the administrative record to assess this pollutant. A total of zero of two samples exceed the evaluation guideline for the cold freshwater habitat beneficial use; zero of two samples exceed the evaluation guideline for the municipal and domestic supply beneficial use; and zero of two samples exceed the evaluation guideline for the warm freshwater habitat beneficial use. The readily available data and information are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of two samples exceed the evaluation guideline for the cold freshwater habitat beneficial use, zero of two samples exceed the evaluation guideline for the municipal and domestic supply beneficial use, and zero of two samples exceed the evaluation guideline for the warm freshwater habitat beneficial use and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109127, Glyphosate Region 3      Warden Creek
LOE ID:	166946
Pollutant:	Glyphosate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Glyphosate.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of organic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 5.5, Section 64444, Table 64444-A.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for Glyphosate is 0.7 mg/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-05-30
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109127, Glyphosate Region 3      Warden Creek
LOE ID:	166807
Pollutant:	Glyphosate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Glyphosate.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-05-30
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109127, Glyphosate Region 3      Warden Creek
LOE ID:	166802
Pollutant:	Glyphosate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Glyphosate.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Glyphosate is the USEPA Aquatic Life Benchmark of 11900 ug/L for a vascular plant (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-05-30
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109153	Region 3
Warden Creek

Pollutant:	Imidacloprid
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109153, Imidacloprid Region 3      Warden Creek
LOE ID:	167214
Pollutant:	Imidacloprid
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Imidacloprid.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Aquatic life should not be affected unacceptably if the 4-day average concentration of Imidacloprid does not exceed 0.016 ug/L. (UC Davis Water Quality Criteria)
Guideline Reference:	Water Quality Criteria Report for Imidacloprid Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2018-01-10 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109153, Imidacloprid Region 3      Warden Creek
LOE ID:	167112
Pollutant:	Imidacloprid
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Imidacloprid.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Aquatic life should not be affected unacceptably if the 4-day average concentration of Imidacloprid does not exceed 0.016 ug/L. (UC Davis Water Quality Criteria)
Guideline Reference:	Water Quality Criteria Report for Imidacloprid Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology. University of California, Davis
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2018-01-10 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109129	Region 3
Warden Creek

Pollutant:	Lead
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1. Under section 3.1 at least one line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Zero of the five dissolved lead samples exceed the evaluation guidelines for the aquatic life beneficial uses. Zero of the five total lead samples and zero of the three dissolved lead samples exceed the evaluation guideline for the Municipal & Domestic Supply beneficial use. This sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is supported and a minimum of two exceedances is needed to determine if beneficial uses are not supported using table 3.1. Therefore, the use support rating is set to 'insufficient information.' Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. No samples exceed the evaluation guidelines and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109129, Lead Region 3      Warden Creek
LOE ID:	233216
Pollutant:	Lead
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Lead.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of organic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 5.5, Section 64444, Table 64444-A.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for lead is 15 ug/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-05-30 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109129, Lead Region 3      Warden Creek
LOE ID:	168266
Pollutant:	Lead
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Lead.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109129, Lead Region 3      Warden Creek
LOE ID:	233217
Pollutant:	Lead
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Lead.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of organic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 5.5, Section 64444, Table 64444-A.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for lead is 15 ug/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109129, Lead Region 3      Warden Creek
LOE ID:	168164
Pollutant:	Lead
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Lead.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109130	Region 3
Warden Creek

Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109130, Lindane/gamma Hexachlorocyclohexane (gamma-HCH) Region 3      Warden Creek
LOE ID:	154620
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for HCH, gamma- .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Lindane from MacDonald et al., 2000a which states that the probable effect concentration for Lindane is 4.99 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109130, Lindane/gamma Hexachlorocyclohexane (gamma-HCH) Region 3      Warden Creek
LOE ID:	154595
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for HCH, gamma- .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Lindane from MacDonald et al., 2000a which states that the probable effect concentration for Lindane is 4.99 ug/kg. (dw = Dry Weight)
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2010-05-26
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109131	Region 3
Warden Creek

Pollutant:	Linuron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of three lines of evidence are available in the administrative record to assess this pollutant. A total of zero of two samples exceed the evaluation guideline for the cold freshwater habitat beneficial use; zero of two samples exceed the evaluation guideline for the municipal and domestic supply beneficial use; and zero of two samples exceed the evaluation guideline for the warm freshwater habitat beneficial use. The readily available data and information are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of two samples exceed the evaluation guideline for the cold freshwater habitat beneficial use, zero of two samples exceed the evaluation guideline for the municipal and domestic supply beneficial use, and zero of two samples exceed the evaluation guideline for the warm freshwater habitat beneficial use and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109131, Linuron Region 3      Warden Creek
LOE ID:	168509
Pollutant:	Linuron
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Linuron.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109131, Linuron Region 3      Warden Creek
LOE ID:	168508
Pollutant:	Linuron
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Linuron.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109131, Linuron Region 3      Warden Creek
LOE ID:	168571
Pollutant:	Linuron
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Linuron.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for linuron is 1.4 ug/L.
Guideline Reference:	IRIS Reference Summary (Various Pollutants)
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109132	Region 3
Warden Creek

Pollutant:	Malathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Zero of three samples exceed the evaluation guideline (Faria et al., 2010) applied to protect aquatic life beneficial uses. Zero of three samples exceed the evaluation guideline for drinking water (USEPA drinking water health advisory). These sample sizes are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List because applicable water quality standards are not being exceeded. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero samples exceeded the evaluation guidelines and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. These sample sizes are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109132, Malathion Region 3      Warden Creek
LOE ID:	168760
Pollutant:	Malathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Malathion.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The USEPA drinking water health advisory for malathion is 500 ug/L.
Guideline Reference:	2018 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109132, Malathion Region 3      Warden Creek
LOE ID:	168905
Pollutant:	Malathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Malathion.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Aquatic life should not be affected unacceptably if the four-day average concentration of malathion does not exceed 0.028 ug/L more than once every three years on the average (Faria et al., 2010).
Guideline Reference:	Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109132, Malathion Region 3      Warden Creek
LOE ID:	168677
Pollutant:	Malathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Malathion.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Aquatic life should not be affected unacceptably if the four-day average concentration of malathion does not exceed 0.028 ug/L more than once every three years on the average (Faria et al., 2010).
Guideline Reference:	Aquatic life water quality criteria derived via the UC Davis method: l. Organophosphate insecticides. Reviews of Environmental Contamination and Toxicology 216:1-48.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-09-17
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109110	Region 3
Warden Creek

Pollutant:	Methamidophos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109110, Methamidophos Region 3      Warden Creek
LOE ID:	169463
Pollutant:	Methamidophos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Methamidophos.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Methamifophos is the USEPA Aquatic Life Benchmark of 4.5 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109110, Methamidophos Region 3      Warden Creek
LOE ID:	169462
Pollutant:	Methamidophos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Methamidophos.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Methamifophos is the USEPA Aquatic Life Benchmark of 4.5 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109158	Region 3
Warden Creek

Pollutant:	Methidathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Zero of four water samples exceeded the USEPA aquatic life evaluation guideline. Zero of four water samples exceed the USEPA drinking water health advisory level for municipal and domestic water supply. These sample sizes are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is supported using table 3.1. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List because applicable water quality standards are not being exceeded. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero samples exceed the evaluation guidelines. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109158, Methidathion Region 3      Warden Creek
LOE ID:	169729
Pollutant:	Methidathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Methidathion.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109158, Methidathion Region 3      Warden Creek
LOE ID:	169602
Pollutant:	Methidathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Methidathion.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for methidathion is 0.7 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, and 20% relative source contribution from drinking water. An additional uncertainty factor of 10 is used for Class C carcinogens.
Guideline Reference:	IRIS Database Calculations (summary)
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109158, Methidathion Region 3      Warden Creek
LOE ID:	169843
Pollutant:	Methidathion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Methidathion.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109154	Region 3
Warden Creek

Pollutant:	Methiocarb
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of two lines of evidence are available in the administrative record to assess this pollutant. A total of zero of three samples exceed the evaluation guideline for the cold freshwater habitat beneficial use and zero of three samples exceed the evaluation guideline for the warm freshwater habitat beneficial use. The readily available data and information are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of three samples exceed the evaluation guideline for the cold freshwater habitat beneficial use and zero of three samples exceed the evaluation guideline for the warm freshwater habitat beneficial use and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109154, Methiocarb Region 3      Warden Creek
LOE ID:	170211
Pollutant:	Methiocarb
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Methiocarb.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for a invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109154, Methiocarb Region 3      Warden Creek
LOE ID:	170190
Pollutant:	Methiocarb
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Methiocarb.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for a invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109155	Region 3
Warden Creek

Pollutant:	Methomyl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109155, Methomyl Region 3      Warden Creek
LOE ID:	170063
Pollutant:	Methomyl
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Methomyl.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The life-time health advisory for methomyl is 200 ug/L (USEPA 2018).
Guideline Reference:	2018 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109155, Methomyl Region 3      Warden Creek
LOE ID:	170179
Pollutant:	Methomyl
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Methomyl.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Methomyl is the USEPA Aquatic Life Benchmark of 0.7 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109155, Methomyl Region 3      Warden Creek
LOE ID:	170201
Pollutant:	Methomyl
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Methomyl.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Methomyl is the USEPA Aquatic Life Benchmark of 0.7 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109134	Region 3
Warden Creek

Pollutant:	Nickel
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of four lines of evidence are available in the administrative record to assess this pollutant. A total of zero of five samples exceed the water quality objective for the cold freshwater habitat beneficial use, zero of five samples exceed the dissolved fraction evaluation guideline and zero of five samples exceed the total fraction evaluation guideline for the municipal and domestic supply beneficial use and zero of five samples exceed the water quality objective for the warm freshwater habitat beneficial use. These data are insufficient to determine the applicable beneficial use support rating with the power and confidence required by the Listing Policy. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of five samples exceed the water quality objective for the cold freshwater habitat beneficial use, zero of five samples exceed the dissolved fraction evaluation guideline and zero of five samples exceed the total fraction evaluation guideline for the municipal and domestic supply beneficial use and zero of five samples exceed the water quality objective for the warm freshwater habitat beneficial use. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109134, Nickel Region 3      Warden Creek
LOE ID:	170908
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Nickel.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109134, Nickel Region 3      Warden Creek
LOE ID:	170920
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Nickel.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain concentrations of inorganic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431 and 64433.2 (Water Quality Control Plan, Central Coast Basin)
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The maximum contaminant level of nickel in public water systems shall be 0.1 mg/L (California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109134, Nickel Region 3      Warden Creek
LOE ID:	170812
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Nickel.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109134, Nickel Region 3      Warden Creek
LOE ID:	170782
Pollutant:	Nickel
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Nickel.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain concentrations of inorganic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431 and 64433.2 (Water Quality Control Plan, Central Coast Basin)
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The maximum contaminant level of nickel in public water systems shall be 0.1 mg/L (California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109138	Region 3
Warden Creek

Pollutant:	Organophosphate Pesticides
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of five water samples exceeded the aquatic life evaluation guideline for additive effects of chlorpyrifos and diazinon (Bailey et al., 1997). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of five water samples exceeded the evaluation guideline, and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109138, Organophosphate Pesticides Region 3      Warden Creek
LOE ID:	173808
Pollutant:	Organophosphate Pesticides
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Organophosphorus Pesticides.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for the protection of aquatic life from the additive effects of the organophophate pesticides chlorpyrifos and diazinon is one toxic unit equivalent. A toxic unit equivalent is equal to the sum of chlorpyrifos and diazinon from a single sample, each having their reported concentration divided their respective evaluation guideline prior to being summed. If this results in a value greater than one, the sample is considered to be in exceedance of the water quality standard. (Bailey et al., 1997).
Guideline Reference:	Joint acute toxicity of Diazinon and Chlorpyrifos to Ceriodaphnia dubia.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109138, Organophosphate Pesticides Region 3      Warden Creek
LOE ID:	173788
Pollutant:	Organophosphate Pesticides
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Organophosphorus Pesticides.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for the protection of aquatic life from the additive effects of the organophophate pesticides chlorpyrifos and diazinon is one toxic unit equivalent. A toxic unit equivalent is equal to the sum of chlorpyrifos and diazinon from a single sample, each having their reported concentration divided their respective evaluation guideline prior to being summed. If this results in a value greater than one, the sample is considered to be in exceedance of the water quality standard. (Bailey et al., 1997).
Guideline Reference:	Joint acute toxicity of Diazinon and Chlorpyrifos to Ceriodaphnia dubia.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109140	Region 3
Warden Creek

Pollutant:	Oxamyl (Vydate)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109140, Oxamyl (Vydate) Region 3      Warden Creek
LOE ID:	174090
Pollutant:	Oxamyl (Vydate)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Oxamyl.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Oxamyl is the USEPA Aquatic Life Benchmark of 27 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109140, Oxamyl (Vydate) Region 3      Warden Creek
LOE ID:	174091
Pollutant:	Oxamyl (Vydate)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Oxamyl.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of organic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Article 5.5, Section 64444, Table 64444-A.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for Oxamyl is 0.05 mg/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109140, Oxamyl (Vydate) Region 3      Warden Creek
LOE ID:	174258
Pollutant:	Oxamyl (Vydate)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Oxamyl.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Oxamyl is the USEPA Aquatic Life Benchmark of 27 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109171	Region 3
Warden Creek

Pollutant:	Paraquat
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of two lines of evidence are available in the administrative record to assess this pollutant. A total of zero of two samples exceed the evaluation guideline for the cold freshwater habitat beneficial use and zero of two samples exceed the evaluation guideline for the warm freshwater habitat beneficial use. The readily available data and information are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of two samples exceed the evaluation guideline for the cold freshwater habitat beneficial use and zero of two samples exceed the evaluation guideline for the warm freshwater habitat beneficial use and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109171, Paraquat Region 3      Warden Creek
LOE ID:	176462
Pollutant:	Paraquat
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Paraquat.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Paraquat is the USEPA Aquatic Life Benchmark of 0.396 ug/L for a nonvascular plant (acute) for Paraquat dichloride.
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-05-30
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109171, Paraquat Region 3      Warden Creek
LOE ID:	176508
Pollutant:	Paraquat
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Paraquat.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Paraquat is the USEPA Aquatic Life Benchmark of 0.396 ug/L for a nonvascular plant (acute) for Paraquat dichloride.
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-05-30
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109142	Region 3
Warden Creek

Pollutant:	Pentachlorophenol (PCP)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109142, Pentachlorophenol (PCP) Region 3      Warden Creek
LOE ID:	176458
Pollutant:	Pentachlorophenol (PCP)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Pentachlorophenol.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Pentachlorophenol criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is pH dependent. The criteria has a value of 15 ug/L when based on a default pH of 7.8. (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109142, Pentachlorophenol (PCP) Region 3      Warden Creek
LOE ID:	176517
Pollutant:	Pentachlorophenol (PCP)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the water quality threshold for Pentachlorophenol. Although a total of 5 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Pentachlorophenol criteria for the protection of human health from the consumption of water and organisms is 0.28 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP).
Temporal Representation:	Data for this waterbody was collected over the date range 2013-03-26 to 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109142, Pentachlorophenol (PCP) Region 3      Warden Creek
LOE ID:	176865
Pollutant:	Pentachlorophenol (PCP)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Pentachlorophenol.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Pentachlorophenol criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is pH dependent. The criteria has a value of 15 ug/L when based on a default pH of 7.8. (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109172	Region 3
Warden Creek

Pollutant:	Permethrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 and 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment. The pollutant concentration in sediment must be associated with toxicity to result in addition of the pollutant to the Section 303(d) List. Two line of evidence is available in the administrative record to assess this pollutant. Zero of the three sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses. A minimum of 16 samples is needed to determine if a beneficial use is supported and a minimum of two exceedances is needed to determine if beneficial uses are not supported using table 3.1 of the Listing Policy. Therefore, the use support rating is set to 'insufficient information'. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the three sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109172, Permethrin Region 3      Warden Creek
LOE ID:	154935
Pollutant:	Permethrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Permethrin, Total .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for permethrin is the median lethal concentration (LC50) of 8.9 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 8.9 ug/g is the geometric mean of LC50 values for permethrin from Amweg et al. (2005).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109172, Permethrin Region 3      Warden Creek
LOE ID:	155461
Pollutant:	Permethrin
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Permethrin, Total .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for permethrin is the median lethal concentration (LC50) of 8.9 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 8.9 ug/g is the geometric mean of LC50 values for permethrin from Amweg et al. (2005).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109144	Region 3
Warden Creek

Pollutant:	Phenol
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109144, Phenol Region 3      Warden Creek
LOE ID:	179698
Pollutant:	Phenol
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phenol.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The phenol criteria for the protection of human health from the consumption of water and organisms is 21,000 ug/L (Basin Plan).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109162	Region 3
Warden Creek

Pollutant:	Phorate
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 and 3.6 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Zero of four water samples exceeded the USEPA aquatic life evaluation guideline. Zero of four water samples exceed the National Academy of Sciences drinking water health advisory for municipal and domestic water supply. These sample sizes are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is supported using table 3.1. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List because applicable water quality standards are not being exceeded. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero samples exceed the evaluation guidelines. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109162, Phorate Region 3      Warden Creek
LOE ID:	180166
Pollutant:	Phorate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phorate.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109162, Phorate Region 3      Warden Creek
LOE ID:	180244
Pollutant:	Phorate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phorate.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109162, Phorate Region 3      Warden Creek
LOE ID:	180409
Pollutant:	Phorate
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phorate.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The National Academy of Sciences health advisory for phorate is 0.7 ug/L. This was calculated using the no-adverse-effect dosage of 0.01 mg/kg, assuming 70 kg body weight, 2 liters/day water consumption, 20% relative source contribution from drinking water, and divided by 100 for a factor of safety.
Guideline Reference:	National Academy of Sciences - Volume I Drinking Water and Health
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109165	Region 3
Warden Creek

Pollutant:	Phosmet
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 and 3.6 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Three lines of evidence are available in the administrative record to assess this pollutant. Zero of four water samples exceed the USEPA aquatic life evaluation guideline. Zero of four samples exceed the USEPA drinking water health advisory. These sample sizes are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is supported using table 3.1. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List because applicable water quality standards are not being exceeded. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero samples exceed the evaluation guidelines. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109165, Phosmet Region 3      Warden Creek
LOE ID:	180319
Pollutant:	Phosmet
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phosmet.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Phosmet is the USEPA Aquatic Life Benchmark of 0.8 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109165, Phosmet Region 3      Warden Creek
LOE ID:	180361
Pollutant:	Phosmet
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phosmet.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Based on USEPA IRIS reference dose (RfD) as a drinking water level, the drinking water health advisory level for phosmet is 140 ug/L. This was calculated assuming 70 kg body weight, 2 liters/day water consumption, and 20% relative source contribution from drinking water. An additional uncertainty factor of 10 is used for Class C carcinogens.
Guideline Reference:	IRIS Reference Summary (Various Pollutants)
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109165, Phosmet Region 3      Warden Creek
LOE ID:	180159
Pollutant:	Phosmet
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Phosmet.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Phosmet is the USEPA Aquatic Life Benchmark of 0.8 ug/L for a invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109152	Region 3
Warden Creek

Pollutant:	Pyrethroids
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under sections 3.1 and 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment. The pollutant concentration in sediment must be associated with toxicity to result in addition of the pollutant to the Section 303(d) List. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the three sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses. A minimum of 16 samples is needed to determine if a beneficial use is supported and a minimum of two exceedances is needed to determine if beneficial uses are not supported using table 3.1 of the Listing Policy. Therefore, the use support rating is set to 'insufficient information'. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the three sediment samples exceed the evaluation guideline applied to protect for aquatic life beneficial uses and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109152, Pyrethroids Region 3      Warden Creek
LOE ID:	155757
Pollutant:	Pyrethroids
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Pyrethroids .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for the protection of aquatic life from pyrethroids is one toxic unit. Individual pyrethroid concentrations in sediment were normalized to organic carbon content, divided by the respective LC50 and then summed. A sum over over one toxic unit is an exceedance of the evaluation guideline (Amweg et al. 2006).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Guideline Reference:	Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15
Guideline Reference:	Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.
Guideline Reference:	Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.
Guideline Reference:	Pyrethroid insecticides and sediment toxicity in urban creeks from California and Tennessee. Environmental Science and Technology, 40(5): 1700-1706
Guideline Reference:	Compilation of freshwater OC-normalized sediment toxicity data for pyrethroids
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109152, Pyrethroids Region 3      Warden Creek
LOE ID:	155710
Pollutant:	Pyrethroids
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Pyrethroids .
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for the protection of aquatic life from pyrethroids is one toxic unit. Individual pyrethroid concentrations in sediment were normalized to organic carbon content, divided by the respective LC50 and then summed. A sum over over one toxic unit is an exceedance of the evaluation guideline (Amweg et al. 2006).
Guideline Reference:	Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
Guideline Reference:	Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15
Guideline Reference:	Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83¿92.
Guideline Reference:	Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396.
Guideline Reference:	Pyrethroid insecticides and sediment toxicity in urban creeks from California and Tennessee. Environmental Science and Technology, 40(5): 1700-1706
Guideline Reference:	Compilation of freshwater OC-normalized sediment toxicity data for pyrethroids
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 310WRP.
Temporal Representation:	Data for this waterbody were collected over the date range 2010-05-26 to 2017-04-24
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109146	Region 3
Warden Creek

Pollutant:	Selenium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:	This decision was made by SWRCB staff.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 109146, Selenium Region 3      Warden Creek
LOE ID:	181076
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Selenium.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of inorganic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431 and 64433.2.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for selenium is 0.05 mg/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109146, Selenium Region 3      Warden Creek
LOE ID:	181556
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Selenium.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The criterion continuous concentration to protect aquatic life in freshwater is 0.005 mg/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2018-01-10 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109146, Selenium Region 3      Warden Creek
LOE ID:	181053
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 5 samples exceeded the water quality threshold for Selenium.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The criterion continuous concentration to protect aquatic life in freshwater is 0.005 mg/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109146, Selenium Region 3      Warden Creek
LOE ID:	180889
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 5 samples exceeded the water quality threshold for Selenium.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The criterion continuous concentration to protect aquatic life in freshwater is 0.005 mg/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109146, Selenium Region 3      Warden Creek
LOE ID:	181554
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Selenium.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All inland surface waters, enclosed bays, and estuaries shall not contain concentrations of inorganic chemicals in excess of the maximum contaminant levels for primary drinking water standards specified in California Code of Regulations, Title 22, Division 4, Chapter 15, Sections 64431 and 64433.2.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for selenium is 0.05 mg/L (California Code of Regulations, Title 22).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2018-01-10 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109146, Selenium Region 3      Warden Creek
LOE ID:	180978
Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Selenium.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The criterion continuous concentration to protect aquatic life in freshwater is 0.005 mg/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2018-01-10 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109147	Region 3
Warden Creek

Pollutant:	Simazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of three lines of evidence are available in the administrative record to assess this pollutant. A total of zero of three samples exceed the evaluation guideline for the cold freshwater habitat beneficial use; zero of three samples exceed the evaluation guideline for the municipal and domestic supply beneficial use; and zero of three samples exceed the evaluation guideline for the warm freshwater habitat beneficial use. The readily available data and information are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of three samples exceed the evaluation guideline for the cold freshwater habitat beneficial use, zero of three samples exceed the evaluation guideline for the municipal and domestic supply beneficial use, and zero of three samples exceed the evaluation guideline for the warm freshwater habitat beneficial use and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109147, Simazine Region 3      Warden Creek
LOE ID:	181628
Pollutant:	Simazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Simazine.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109147, Simazine Region 3      Warden Creek
LOE ID:	181772
Pollutant:	Simazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Simazine.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The evaluation guideline for Simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109147, Simazine Region 3      Warden Creek
LOE ID:	181934
Pollutant:	Simazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Simazine.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall reach concentrations that adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The California Maximum Contaminant Level for Simazine incorporated by reference in the Basin Plan is 4 ug/L (Basin Plan).
Guideline Reference:	California MCLs - Title 17 and Title 22 documents for 2019 - California Regulations Related to Drinking Water
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2013-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	126157	Region 3
Warden Creek

Pollutant:	Temperature, water
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. A total of eight lines of evidence are available in the administrative record to assess this pollutant. A total of zero of 293 samples exceed the evaluation guideline (Moyle 1976) applied to protect the cold freshwater habitat beneficial use. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of 293 samples exceed the evaluation guideline applied to protect the cold freshwater habitat beneficial use and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 126157, Temperature, water Region 3      Warden Creek
LOE ID:	52682
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for Water Temperature.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such alteration in temperature does not adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:	The optimum range for growth and completion of most life stages of rainbow trout is 13-21 degrees Celsius (Moyle 1976).
Guideline Reference:	Inland Fishes of California
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 126157, Temperature, water Region 3      Warden Creek
LOE ID:	13452
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for Water Temperature.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such alteration in temperature does not adversely affect beneficial uses (General Objective in Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Guideline Reference:	Inland Fishes of California
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 126157, Temperature, water Region 3      Warden Creek
LOE ID:	14600
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for Water Temperature.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such alteration in temperature does not adversely affect beneficial uses (General Objective in Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Guideline Reference:	Inland Fishes of California
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 126157, Temperature, water Region 3      Warden Creek
LOE ID:	47904
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	67
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 67 samples exceed the criterion for Water Temperature.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such alteration in temperature does not adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The optimum range for growth and completion of most life stages of rainbow trout is 13-21 degrees Celsius (Moyle 1976).
Guideline Reference:	The Effects of Turbidity on Prey Selection by Piscivorous Largemouth Bass
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 126157, Temperature, water Region 3      Warden Creek
LOE ID:	48881
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	25
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 25 samples exceed the criterion for Water Temperature.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such alteration in temperature does not adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The optimum range for growth and completion of most life stages of rainbow trout is 13-21 degrees Celsius (Moyle 1976).
Guideline Reference:	Inland Fishes of California
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-6/30/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 126157, Temperature, water Region 3      Warden Creek
LOE ID:	217045
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	75
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 75 samples exceeded the water quality threshold for Temperature.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such alteration in temperature does not adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The optimum range for growth and completion of most life stages of rainbow trout is 13-21 degrees Celsius (Moyle 1976).
Guideline Reference:	Inland Fishes of California
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-04-12 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 126157, Temperature, water Region 3      Warden Creek
LOE ID:	217124
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	67
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 67 samples exceeded the water quality threshold for Temperature.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such alteration in temperature does not adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The optimum range for growth and completion of most life stages of rainbow trout is 13-21 degrees Celsius (Moyle 1976).
Guideline Reference:	Inland Fishes of California
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 126157, Temperature, water Region 3      Warden Creek
LOE ID:	216892
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	32
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality threshold for Temperature.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such alteration in temperature does not adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	The optimum range for growth and completion of most life stages of rainbow trout is 13-21 degrees Celsius (Moyle 1976).
Guideline Reference:	Inland Fishes of California
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program

DECISION ID	109149	Region 3
Warden Creek

Pollutant:	Trifluralin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of two lines of evidence are available in the administrative record to assess this pollutant. A total of zero of two samples exceed the evaluation guideline for the cold freshwater habitat beneficial use and zero of two samples exceed the evaluation guideline for the warm freshwater habitat beneficial use. The readily available data and information are insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of two samples exceed the evaluation guideline for the cold freshwater habitat beneficial use and zero of two samples exceed the evaluation guideline for the warm freshwater habitat beneficial use and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109149, Trifluralin Region 3      Warden Creek
LOE ID:	182292
Pollutant:	Trifluralin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Trifluralin.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Trifluralin does not exceed 0.33 ug/L in the water column more than once every three years on average (Bower, et al. 2017).
Guideline Reference:	Water Quality Criteria Report for Trifluralin Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology University of California, Davis.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109149, Trifluralin Region 3      Warden Creek
LOE ID:	182248
Pollutant:	Trifluralin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Trifluralin.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Trifluralin does not exceed 0.33 ug/L in the water column more than once every three years on average (Bower, et al. 2017).
Guideline Reference:	Water Quality Criteria Report for Trifluralin Phase III: Application of the pesticide water quality criteria methodology. Department of Environmental Toxicology University of California, Davis.
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109150	Region 3
Warden Creek

Pollutant:	Turbidity
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. A total of 16 lines of evidence are available in the administrative record to assess this pollutant. Sample and exceedance counts for the lines of evidence with the fraction identified as “none” or “not recorded” are grouped together with those having the fraction “total”, based on the analytical method used. Once summed, a total of 16 of 291 samples exceed the evaluation guideline for cold freshwater habitat (Sigler et al. 1984) and 13 of 291 samples exceed the evaluation guideline for warm freshwater habitat (Shoup, D.E. and Wahl D.H., 2009) used to interpret the water quality objectives for the aquatic life beneficial uses. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of 16 of 291 samples exceed the evaluation guideline for cold freshwater habitat and 13 of 291 samples exceed the evaluation guideline for warm freshwater habitat and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	183151
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	32
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality threshold for Turbidity.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. (Basin Plan)
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Turbidities of 25 NTU or greater can cause a reduction in juvenile salmonid growth due to interference with their ability to find food (Sigler et al. 1984).
Guideline Reference:	Effects of chronic turbidity on density and growth of steelheads and coho salmon. Transactions of the American Fisheries Society 113:142-150
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	182945
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	67
Number of Exceedances:	5
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 5 of 67 samples exceeded the water quality threshold for Turbidity.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Turbidities of 40 NTU or greater can cause a reduced foraging efficiency and a shift in prey selection in piscivorous fish (largemouth bass) due to interference with their ability to find prey (Shoup, D.E. and Wahl D.H., 2009).
Guideline Reference:	The Effects of Turbidity on Prey Selection by Piscivorous Largemouth Bass
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	183092
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	75
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 75 samples exceeded the water quality threshold for Turbidity.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. (Basin Plan)
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Turbidities of 25 NTU or greater can cause a reduction in juvenile salmonid growth due to interference with their ability to find food (Sigler et al. 1984).
Guideline Reference:	Effects of chronic turbidity on density and growth of steelheads and coho salmon. Transactions of the American Fisheries Society 113:142-150
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-03-29 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	182926
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	32
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 32 samples exceeded the water quality threshold for Turbidity.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Turbidities of 40 NTU or greater can cause a reduced foraging efficiency and a shift in prey selection in piscivorous fish (largemouth bass) due to interference with their ability to find prey (Shoup, D.E. and Wahl D.H., 2009).
Guideline Reference:	The Effects of Turbidity on Prey Selection by Piscivorous Largemouth Bass
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	183053
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	75
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 75 samples exceeded the water quality threshold for Turbidity.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses (Water Quality Control Plan, Central Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Turbidities of 40 NTU or greater can cause a reduced foraging efficiency and a shift in prey selection in piscivorous fish (largemouth bass) due to interference with their ability to find prey (Shoup, D.E. and Wahl D.H., 2009).
Guideline Reference:	The Effects of Turbidity on Prey Selection by Piscivorous Largemouth Bass
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-03-29 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	52743
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 1 of 8 samples exceed the criterion for Turbidity(NTU).
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:	Turbidities of 40 NTU or greater can cause a reduction in piscivorous fish (largemouth bass) growth due to interference with their ability to find food (Shoup, D.E. and Wahl D.H., 2009).
Guideline Reference:	The Effects of Turbidity on Prey Selection by Piscivorous Largemouth Bass
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	13436
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 2 of 8 samples exceed the criterion for Turbidity(NTU).
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Sigler et al. (1984) states that turbidities of 25 NTU's or greater caused reduction in juvenile salmonid growth due to interference with their ability to find food.
Guideline Reference:	Effects of chronic turbidity on density and growth of steelheads and coho salmon. Transactions of the American Fisheries Society 113:142-150
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	14599
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 1 of 11 samples exceed the criterion for Turbidity(NTU).
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Sigler et al. (1984) states that turbidities of 25 NTU's or greater caused reduction in juvenile salmonid growth due to interference with their ability to find food.
Guideline Reference:	Effects of chronic turbidity on density and growth of steelheads and coho salmon. Transactions of the American Fisheries Society 113:142-150
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	47892
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	65
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 65 samples exceed the criterion for Turbidity(NTU).
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Turbidities of 40 NTU or greater can cause a reduction in piscivorous fish (largemouth bass) growth due to interference with their ability to find food (Shoup, D.E. and Wahl D.H., 2009).
Guideline Reference:	Effects of chronic turbidity on density and growth of steelheads and coho salmon. Transactions of the American Fisheries Society 113:142-150
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	48880
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	25
Number of Exceedances:	3
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 3 of 25 samples exceed the criterion for Turbidity(NTU).
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Turbidities of 40 NTU or greater can cause a reduction in piscivorous fish (largemouth bass) growth due to interference with their ability to find food (Shoup, D.E. and Wahl D.H., 2009).
Guideline Reference:	The Effects of Turbidity on Prey Selection by Piscivorous Largemouth Bass
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-6/30/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	14584
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 1 of 11 samples exceed the criterion for Turbidity(NTU).
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Sigler et al. (1984) states that turbidities of 25 NTU's or greater caused reduction in juvenile salmonid growth due to interference with their ability to find food.
Guideline Reference:	Effects of chronic turbidity on density and growth of steelheads and coho salmon. Transactions of the American Fisheries Society 113:142-150
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	13435
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 2 of 8 samples exceed the criterion for Turbidity(NTU).
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Sigler et al. (1984) states that turbidities of 25 NTU's or greater caused reduction in juvenile salmonid growth due to interference with their ability to find food.
Guideline Reference:	Effects of chronic turbidity on density and growth of steelheads and coho salmon. Transactions of the American Fisheries Society 113:142-150
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	182939
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	67
Number of Exceedances:	7
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 7 of 67 samples exceeded the water quality threshold for Turbidity.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. (Basin Plan)
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Turbidities of 25 NTU or greater can cause a reduction in juvenile salmonid growth due to interference with their ability to find food (Sigler et al. 1984).
Guideline Reference:	Effects of chronic turbidity on density and growth of steelheads and coho salmon. Transactions of the American Fisheries Society 113:142-150
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	48879
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	25
Number of Exceedances:	3
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 3 of 25 samples exceed the criterion for Turbidity(NTU).
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. (Basin Plan)
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Turbidities of 25 NTU or greater can cause a reduction in juvenile salmonid growth due to interference with their ability to find food (Sigler et al. 1984).
Guideline Reference:	Effects of chronic turbidity on density and growth of steelheads and coho salmon. Transactions of the American Fisheries Society 113:142-150
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-6/30/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	52681
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 2 of 8 samples exceed the criterion for Turbidity(NTU).
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. (Basin Plan)
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:	Turbidities of 25 NTU or greater can cause a reduction in juvenile salmonid growth due to interference with their ability to find food (Sigler et al. 1984).
Guideline Reference:	Effects of chronic turbidity on density and growth of steelheads and coho salmon. Transactions of the American Fisheries Society 113:142-150
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 109150, Turbidity Region 3      Warden Creek
LOE ID:	47891
Pollutant:	Turbidity
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	65
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 65 samples exceed the criterion for Turbidity(NTU).
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall be free of changes in turbidity that cause nuisance or adversely affect beneficial uses. (Basin Plan)
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Turbidities of 25 NTU or greater can cause a reduction in juvenile salmonid growth due to interference with their ability to find food (Sigler et al. 1984).
Guideline Reference:	Effects of chronic turbidity on density and growth of steelheads and coho salmon. Transactions of the American Fisheries Society 113:142-150
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2

DECISION ID	109151	Region 3
Warden Creek

Pollutant:	Zinc
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the Clean Water Act (CWA) section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. A total of two lines of evidence are available in the administrative record to assess this pollutant. A total of zero of three samples exceed the water quality objective for the cold freshwater habitat beneficial use and zero of three samples exceed the water quality objective for the warm freshwater habitat beneficial use. These data are insufficient to determine the applicable beneficial use support rating with the power and confidence required by the Listing Policy. After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. A total of zero of three samples exceed the water quality objective for the cold freshwater habitat beneficial use and zero of three samples exceed the water quality objective for the warm freshwater habitat beneficial use. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 109151, Zinc Region 3      Warden Creek
LOE ID:	182844
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Zinc.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-05-30 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109151, Zinc Region 3      Warden Creek
LOE ID:	182695
Pollutant:	Zinc
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Zinc.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2013-05-30 and 2018-01-10
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109143	Region 3
Warden Creek

Pollutant:	pH
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Forty lines of evidence is available in the administrative record to assess this pollutant. Seven of the 288 samples exceed the maximum pH water quality objective for Municipal and Domestic Supply, Contact and Non-contact Recreation beneficial uses. Fourteen of the 288 samples exceed the maximum pH water quality objective for Cold and Warm Freshwater Habitat. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Seven of the 288 samples exceed the maximum pH water quality objective for Municipal and Domestic Supply, Contact and Non-contact Recreation beneficial uses, 14 of the 288 samples exceed the maximum pH water quality objective for Cold and Warm Freshwater Habitat and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) List because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	11594
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for pH.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin, General Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: For waters not mentioned by a specific beneficial use, the pH value shall not be depressed below 7.0 or raised above 8.5.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	177906
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	32
Number of Exceedances:	5
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 5 of 32 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for municipal and domestic supply (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	47874
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	65
Number of Exceedances:	10
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 10 of 65 samples exceed the criterion for pH.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall not be depressed below 7.0 or raised above 8.5 (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	pH was measured using test strips. In recent communication with the program QA officer concern has been raised about underestimation of the result with test strips.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	52665
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for pH.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall not be depressed below 7.0 or raised above 8.5 (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	14549
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for pH.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin, General Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: For waters not mentioned by a specific beneficial use, the pH value shall not be depressed below 7.0 or raised above 8.5.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	52702
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for pH.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall not be depressed below 6.5 or raised above 8.3 (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	48869
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	22
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 22 samples exceed the criterion for pH.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall not be depressed below 6.5 or raised above 8.3 (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	47887
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	65
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 65 samples exceed the criterion for pH.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall not be depressed below 6.5 or raised above 8.3 (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	pH was measured using test strips. In recent communication with the program QA officer concern has been raised about underestimation of the result with test strips.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	14580
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for pH.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin, Section II.A.2. Municipal and Domestic Supply Objectives, Section II.A.2.a states the following: The pH value shall neither be depressed below 6.5 or raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	11595
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for pH.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin, Section II.A.2. Municipal and Domestic Supply Objectives, Section II.A.2.a states the following: The pH value shall neither be depressed below 6.5 or raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	47889
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Non-Contact Recreation
Number of Samples:	65
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 65 samples exceed the criterion for pH.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall neither be depressed below 6.5 nor raised above 8.3 (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	pH was measured using test strips. In recent communication with the program QA officer concern has been raised about underestimation of the result with test strips.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	52722
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Non-Contact Recreation
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for pH.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall neither be depressed below 6.5 nor raised above 8.3 (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	14582
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Non-Contact Recreation
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for pH.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for non-contact water recreation uses (Section II.A.2. Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries, II.A.2.a) states the following: pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	48877
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Non-Contact Recreation
Number of Samples:	22
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 22 samples exceed the criterion for pH.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall neither be depressed below 6.5 nor raised above 8.3 (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	11611
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Non-Contact Recreation
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for pH.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for non-contact water recreation uses (Section II.A.2. Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries, II.A.2.a) states the following: pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	11612
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for pH.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin, General Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: For waters not mentioned by a specific beneficial use, the pH value shall not be depressed below 7.0 or raised above 8.5.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	48878
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	22
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 1 of 22 samples exceed the criterion for pH.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall not be depressed below 7.0 or raised above 8.5 (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	14583
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for pH.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Central Coast Basin, General Objective, Chapter III, Section II.A.2 General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states the following: For waters not mentioned by a specific beneficial use, the pH value shall not be depressed below 7.0 or raised above 8.5.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - NOT ON AG WAIVER SITES LIST?????????]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	52742
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for pH.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall not be depressed below 7.0 or raised above 8.5 (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	47890
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	65
Number of Exceedances:	10
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 10 of 65 samples exceed the criterion for pH.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall not be depressed below 7.0 or raised above 8.5 (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	pH was measured using test strips. In recent communication with the program QA officer concern has been raised about underestimation of the result with test strips.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	52705
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for pH.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall neither be depressed below 6.5 nor raised above 8.3 (Basin Plan).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	48870
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	22
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 22 samples exceed the criterion for pH.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall neither be depressed below 6.5 nor raised above 8.3 (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	14581
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for pH.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for water contact recreation uses (Section II.A.2. Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries, II.A.2.a) states the following: pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - NOT ON AG WAIVER SITES LIST?????????]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	11596
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for pH.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for water contact recreation uses (Section II.A.2. Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries, II.A.2.a) states the following: pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	47888
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	65
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 65 samples exceed the criterion for pH.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall neither be depressed below 6.5 nor raised above 8.3 (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 5/31/2002 1:30:00 PM-3/1/2010 11:05:00 AM.
Environmental Conditions:	pH was measured using test strips. In recent communication with the program QA officer concern has been raised about underestimation of the result with test strips.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	178975
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	75
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 75 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for municipal and domestic supply (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-04-12 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	178251
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	32
Number of Exceedances:	5
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 5 of 32 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for water contact recreation (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	178179
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	75
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 75 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for warm fresh water habitat (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 7.0 nor raised above 8.5.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-04-12 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	178178
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	32
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 2 of 32 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for warm fresh water habitat (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 7.0 nor raised above 8.5.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	179066
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	75
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 0 of 75 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for cold fresh water habitat (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 7.0 nor raised above 8.5.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-04-12 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	179044
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	32
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 2 of 32 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for cold fresh water habitat (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 7.0 nor raised above 8.5.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	178792
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	67
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 67 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for cold fresh water habitat (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 7.0 nor raised above 8.5.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	177739
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	67
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 67 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for municipal and domestic supply (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	177183
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Non-Contact Recreation
Number of Samples:	32
Number of Exceedances:	5
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 5 of 32 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for non-contact water recreation (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310UWR)
Temporal Representation:	The samples were collected between the dates of 2011-01-11 and 2013-02-05
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	177526
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	67
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 67 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for warm fresh water habitat (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 7.0 nor raised above 8.5.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	178729
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	75
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 75 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for water contact recreation (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-04-12 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	177323
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Non-Contact Recreation
Number of Samples:	75
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed Morro Bay NEP Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 75 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for non-contact water recreation (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2011-04-12 and 2015-03-10
Environmental Conditions:
QAPP Information:	Morro Bay National Estuary Program. 2018. QAPP for Morro Bay National Estuary Program's Monitoring Program.
QAPP Information Reference(s):	QAPP for Morro Bay National Estuary Program's Monitoring Program
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	178176
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Non-Contact Recreation
Number of Samples:	67
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 67 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for non-contact water recreation (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	177384
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	67
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed RWB3 Cooperative Monitoring Program data for Warden Creek to determine beneficial use support and results are as follows: 1 of 67 samples exceeded the water quality threshold for pH.
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Water Quality Control Plan, Central Coast Basin objective for water contact recreation (Section 3.3.2 Objectives for All Inland Surface Waters, Enclosed Bays, and Estuaries) states that the pH value shall neither be depressed below 6.5 nor raised above 8.3.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site (310WRP)
Temporal Representation:	The samples were collected between the dates of 2010-04-28 and 2018-12-18
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109143, pH Region 3      Warden Creek
LOE ID:	48868
Pollutant:	pH
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	22
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 1 of 22 samples exceed the criterion for pH.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The pH value shall not be depressed below 7.0 or raised above 8.5 (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6

DECISION ID	109148	Region 3
Warden Creek

Pollutant:	Toxicity
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	No Source Analysis Available
Expected TMDL Completion Date:	2035
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) List under section 3.1 and section 3.6 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Twenty-two lines of evidence are available in the administrative record to assess this pollutant. One sample can have multiple toxicity test results (or endpoints) but will be counted only once. One sample is defined as being collected on the same day at the same location. Fourteen LOEs summarize water samples. Three out of 18 water samples were toxic to test organisms (exhibited a significant increase in mortality, decrease in cell density, decrease in growth or reproduction compared to the laboratory control) and therefore exceeded the narrative general water quality objective for toxicity, set to protect for aquatic life beneficial uses. Eight LOEs summarize sediment samples. One out of 5 samples were toxic to test organisms (exhibited a significant increase in mortality, decrease in cell density, decrease in growth or reproduction compared to the laboratory control) which does not exceed the narrative general water quality objective for toxicity, set to protect for aquatic life beneficial uses. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for placing this water segment-pollutant combination on the section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three out of 18 water samples were toxic to test organisms relative to the control and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) List because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	58947
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	One sample was collected to evaluate sediment toxicity. The one sample did not exhibit significant toxicity. The toxicity tests included survival and growth of Hyalella azteca. One sample can have multiple toxicity test results but will be counted only once. One sample is defined as being collected on the same day at the same location with the same lab sample id (if provided).
Data Reference:	Santa Lucia Watershed Rotation 2009
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant, animal, or aquatic life. Region 3 Basin Plan.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold.
Guideline Reference:	Methods for Measuring the Toxicity and Bioaccumulation of Sediment-associated Contaminants with Freshwater Invertebrates, Second Edition. U.S. Environmental Protection Agency Office of Research and Development, Duluth, MI , U.S. Environmental Protection Agency Office of Water, Washington, DC EPA-600/R-99/064
Guideline Reference:	SWAMP_Memo_Toxicity_Data_Intrepretation
Spatial Representation:	The sample was collected at station 310TURxxx.
Temporal Representation:	The sample was collected in May 2009.
Environmental Conditions:
QAPP Information:	The SWAMP QAPP (2002) was followed.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	58956
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	1
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Two samples were collected to evaluate sediment toxicity. One of the two samples exhibited significant toxicity to Hyalella Azteca survival.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. The t-test is used to determine if there is a statistically significant decrease in organism response in the sample as compared to the control.
Guideline Reference:	Methods for Measuring the Toxicity and Bioaccumulation of Sediment-associated Contaminants with Freshwater Invertebrates, Second Edition. U.S. Environmental Protection Agency Office of Research and Development, Duluth, MI , U.S. Environmental Protection Agency Office of Water, Washington, DC EPA-600/R-99/064
Spatial Representation:	The samples were collected at station 310WRP Warden Creek.
Temporal Representation:	The samples were collected in April 2007 and 2008.
Environmental Conditions:
QAPP Information:	The data was collected for the CCRWQCB Cooperative Monitoring Program for Agriculture data and provided in SWAMP format.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	80376
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	1
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Two samples were collected to evaluate sediment toxicity. One of the two samples exhibited significant toxicity to Hyalella Azteca survival.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. The t-test is used to determine if there is a statistically significant decrease in organism response in the sample as compared to the control.
Guideline Reference:	Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition. EPA-821-R-02-012
Spatial Representation:	The samples were collected at station 310WRP Warden Creek.
Temporal Representation:	The samples were collected in April 2007 and 2008.
Environmental Conditions:
QAPP Information:	The data was collected for the CCRWQCB Cooperative Monitoring Program for Agriculture data and provided in SWAMP format.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	80375
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	One sample was collected to evaluate sediment toxicity. The one sample did not exhibit significant toxicity. The toxicity tests included survival and growth of Hyalella azteca. One sample can have multiple toxicity test results but will be counted only once. One sample is defined as being collected on the same day at the same location with the same lab sample id (if provided).
Data Reference:	Santa Lucia Watershed Rotation 2009
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant, animal, or aquatic life. Region 3 Basin Plan.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold.
Guideline Reference:	Methods for Measuring the Toxicity and Bioaccumulation of Sediment-associated Contaminants with Freshwater Invertebrates, Second Edition. U.S. Environmental Protection Agency Office of Research and Development, Duluth, MI , U.S. Environmental Protection Agency Office of Water, Washington, DC EPA-600/R-99/064
Guideline Reference:	SWAMP_Memo_Toxicity_Data_Intrepretation
Spatial Representation:	The sample was collected at station 310TURxxx.
Temporal Representation:	The sample was collected in May 2009.
Environmental Conditions:
QAPP Information:	The SWAMP QAPP (2002) was followed.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	58946
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Four samples were collected to evaluate water toxicity. None of the four samples exhibited significant toxicity. The toxicity tests for the samples included survival and reproduction of Ceriodaphnia dubia, Pimephales promelas survival and growth and Selenastrum capricornutum growth.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. The t-test is used to determine if there is a statistically significant decrease in organism response in the sample as compared to the control.
Guideline Reference:	Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition. EPA-821-R-02-012
Guideline Reference:	Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth Edition. Office of Water, U.S. Environmental Protection Agency. Washington, D.C. EPA-821-R-02-013
Spatial Representation:	The samples were collected at station 310WRP Warden Creek.
Temporal Representation:	The samples were collected in 2008 and 2010.
Environmental Conditions:
QAPP Information:	The data was collected for the CCRWQCB Cooperative Monitoring Program for Agriculture data and provided in SWAMP format. No QAPP provided.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	80374
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Four samples were collected to evaluate water toxicity. None of the four samples exhibited significant toxicity. The toxicity tests for the samples included survival and reproduction of Ceriodaphnia dubia, Pimephales promelas survival and growth and Selenastrum capricornutum growth.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. The t-test is used to determine if there is a statistically significant decrease in organism response in the sample as compared to the control.
Guideline Reference:	Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition. EPA-821-R-02-012
Spatial Representation:	The samples were collected at station 310WRP Warden Creek.
Temporal Representation:	The samples were collected in 2008 and 2010.
Environmental Conditions:
QAPP Information:	The data was collected for the CCRWQCB Cooperative Monitoring Program for Agriculture data and provided in SWAMP format. No QAPP provided.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24717
Pollutant:	Vertebrate Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP_SWAMP Monitoring (00SW3001) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Toxicity, Pimephales promelas Survival (%) 7 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: SWAMP Toxicity Data 2001-06
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected on a single day 3/27/2002. SWAMP toxicity monitoring includes both water samples (collected in both winter and summer) and sediment samples (collected in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24712
Pollutant:	Vertebrate Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPsouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Toxicity, Pimephales promelas Survival (%) 7 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-9/27/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24718
Pollutant:	Vertebrate Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP_SWAMP Monitoring (00SW3001) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Toxicity, Pimephales promelas Survival (%) 7 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: SWAMP Toxicity Data 2001-06
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected on a single day 3/27/2002. SWAMP toxicity monitoring includes both water samples (collected in both winter and summer) and sediment samples (collected in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	148547
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	3
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	3 of the 10 samples collected by RWB3 Cooperative Monitoring Program for Warden Creek exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Ceriodaphnia dubia, for Young/female, Pimephales promelas, for Survival, Chironomus dilutus, for Survival, Selenastrum capricornutum, for Total Cell Count, Pimephales promelas, for Biomass (wt/orig indiv), Ceriodaphnia dubia, for Survival
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Methods for Measuring the Toxicity and Bioaccumulation of Sediment-associated Contaminants with Freshwater Invertebrates, Second Edition. U.S. Environmental Protection Agency Office of Research and Development, Duluth, MI , U.S. Environmental Protection Agency Office of Water, Washington, DC EPA-600/R-99/064
Guideline Reference:	SWAMP_Memo_Toxicity_Data_Intrepretation
Spatial Representation:	The samples were collected at 1 station. Monitoring site: ( 310WRP )
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-04-16.
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	148548
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	3
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	3 of the 10 samples collected by RWB3 Cooperative Monitoring Program for Warden Creek exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Ceriodaphnia dubia, for Young/female, Pimephales promelas, for Survival, Chironomus dilutus, for Survival, Selenastrum capricornutum, for Total Cell Count, Pimephales promelas, for Biomass (wt/orig indiv), Ceriodaphnia dubia, for Survival
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Methods for Measuring the Toxicity and Bioaccumulation of Sediment-associated Contaminants with Freshwater Invertebrates, Second Edition. U.S. Environmental Protection Agency Office of Research and Development, Duluth, MI , U.S. Environmental Protection Agency Office of Water, Washington, DC EPA-600/R-99/064
Guideline Reference:	SWAMP_Memo_Toxicity_Data_Intrepretation
Spatial Representation:	The samples were collected at 1 station. Monitoring site: ( 310WRP )
Temporal Representation:	The samples were collected between the dates of 2013-03-26 and 2018-04-16.
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	149028
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	0 of the 1 samples collected by RWB3 Cooperative Monitoring Program for Warden Creek exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca, for Growth (wt/surv indiv), Hyalella azteca, for Survival
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life (Central Coastal Basin Plan 2019).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 station. Monitoring site: ( 310WRP )
Temporal Representation:	The samples were collected between the dates of 2017-04-24 and 2017-04-24.
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	149042
Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	0 of the 1 samples collected by RWB3 Cooperative Monitoring Program for Warden Creek exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca, for Growth (wt/surv indiv), Hyalella azteca, for Survival
Data Reference:	Field, Habitat, Sediment, Toxicity, Water data for the 2020/2022 integrated report in Region 3.
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life (Central Coastal Basin Plan 2019).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 station. Monitoring site: ( 310WRP )
Temporal Representation:	The samples were collected between the dates of 2017-04-24 and 2017-04-24.
Environmental Conditions:
QAPP Information:	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24723
Pollutant:	Plant Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPsouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Toxicity, Selenastrum capricornutum Growth (Cell Density) 4 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction in cell count of test organism relative to the control (alpha < 0.05) and cell count <80% of control.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-9/27/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24722
Pollutant:	Plant Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPsouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Toxicity, Selenastrum capricornutum Growth (Cell Density) 4 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction in cell count of test organism relative to the control (alpha < 0.05) and cell count <80% of control.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-9/27/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24692
Pollutant:	Invertebrate Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPsouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Toxicity, Ceriodaphnia dubia Survival (%) 7 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-9/27/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24694
Pollutant:	Invertebrate Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP_SWAMP Monitoring (00SW3001) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Toxicity, Ceriodaphnia dubia Survival (%) 7 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: SWAMP Toxicity Data 2001-06
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected on a single day 3/27/2002. SWAMP toxicity monitoring includes both water samples (collected in both winter and summer) and sediment samples (collected in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24688
Pollutant:	Invertebrate Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPsouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Toxicity, Ceriodaphnia dubia Survival (%) 7 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-9/27/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24693
Pollutant:	Invertebrate Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP_SWAMP Monitoring (00SW3001) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Toxicity, Ceriodaphnia dubia Survival (%) 7 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: SWAMP Toxicity Data 2001-06
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected on a single day 3/27/2002. SWAMP toxicity monitoring includes both water samples (collected in both winter and summer) and sediment samples (collected in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24704
Pollutant:	Invertebrate Toxicity
LOE Subgroup:	Toxicity
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPsouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Toxicity, Hyalella azteca Survival (%) 10 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected on a single day 5/17/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24700
Pollutant:	Invertebrate Toxicity
LOE Subgroup:	Toxicity
Matrix:	Sediment
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPsouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Toxicity, Hyalella azteca Survival (%) 10 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected on a single day 5/17/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109148, Toxicity Region 3      Warden Creek
LOE ID:	24716
Pollutant:	Vertebrate Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	TOXICITY TESTING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPsouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 3 samples exceed the criterion for Toxicity, Pimephales promelas Survival (%) 7 days. Toxicity is defined by SWAMP (2004) as follows: Significant toxicity in the survival endpoint when compared to the negative control based on a statistical test with alpha of less than 5%, and less than the evaluation threshold (both criteria are met).
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board (Water Quality Control Plan, Central Coast Basin, Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Evaluation Guideline:	Significant reduction of survival of test organism relative to the control (alpha < 0.05) and test organism survival is 20% less than the control survival.
Guideline Reference:	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-9/27/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):

DECISION ID	109117	Region 3
Warden Creek

Pollutant:	Chlorophyll-a
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	No new data were assessed for the 2020 listing cycle. This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Eight lines of evidence are available in the administrative record to assess this pollutant. Two of the 49 samples exceed the evaluation guideline (North Carolina Administrative code, Title 15A) used to interpret the narrative water quality objective for bio-stimulation risk and aquatic life beneficial uses. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of the 49 samples exceed the evaluation guideline and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. The decision has not changed.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 109117, Chlorophyll-a Region 3      Warden Creek
LOE ID:	52804
Pollutant:	Chlorophyll-a
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 2 of 8 samples exceed the criterion for Chlorophyll a.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (general objective for biostimulatory substances, Water Quality Control Plan, Central Coast Basin, Chapter III, Section II).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:	North Carolina Administrative code (NCAC), Title 15A - Environmental and Natural Resources, Subchapter 2B-Surface water and wetland standards, Rule 0211-Fresh surface water quality standards for class C waters (Class C is defined as freshwaters protected for secondary recreation, fishing, aquatic life including propagation and survival, and wildlife). Section 3(a) of Rule 0211 applies to all fresh surface waters and states that chlorophyll a is not to exceed 40 ug/L.
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Guideline Reference:	Water quality standards table
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 109117, Chlorophyll-a Region 3      Warden Creek
LOE ID:	13416
Pollutant:	Chlorophyll-a
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for Chlorophyll a.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (general objective for biostimulatory substances, Water Quality Control Plan, Central Coast Basin, Chapter III, Section II).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Objective/Criterion Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Objective/Criterion Reference:	Water quality standards table
Evaluation Guideline:	North Carolina Administrative code (NCAC), Title 15A - Environmental and Natural Resources, Subchapter 2B-Surface water and wetland standards, Rule 0211-Fresh surface water quality standards for class C waters (Class C is defined as freshwaters protected for secondary recreation, fishing, aquatic life including propagation and survival, and wildlife). Section 3(a) of Rule 0211 applies to all fresh surface waters and states that chlorophyll a is not to exceed 40 ug/L.
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109117, Chlorophyll-a Region 3      Warden Creek
LOE ID:	48916
Pollutant:	Chlorophyll-a
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	22
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 22 samples exceed the criterion for Chlorophyll a.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (general objective for biostimulatory substances, Water Quality Control Plan, Central Coast Basin, Chapter III, Section II).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	North Carolina Administrative code (NCAC), Title 15A - Environmental and Natural Resources, Subchapter 2B-Surface water and wetland standards, Rule 0211-Fresh surface water quality standards for class C waters (Class C is defined as freshwaters protected for secondary recreation, fishing, aquatic life including propagation and survival, and wildlife). Section 3(a) of Rule 0211 applies to all fresh surface waters and states that chlorophyll a is not to exceed 40 ug/L.
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Guideline Reference:	Water quality standards table
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109117, Chlorophyll-a Region 3      Warden Creek
LOE ID:	52724
Pollutant:	Chlorophyll-a
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 2 of 8 samples exceed the criterion for Chlorophyll a.
Data Reference:	Santa Lucia Watershed Rotation field data 2009
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (general objective for biostimulatory substances, Water Quality Control Plan, Central Coast Basin, Chapter III, Section II).
Objective/Criterion Reference:	Data for Various Pollutants in Westside San Joaquin Water Quality Coalition, 2004-2009.
Evaluation Guideline:	North Carolina Administrative code (NCAC), Title 15A - Environmental and Natural Resources, Subchapter 2B-Surface water and wetland standards, Rule 0211-Fresh surface water quality standards for class C waters (Class C is defined as freshwaters protected for secondary recreation, fishing, aquatic life including propagation and survival, and wildlife). Section 3(a) of Rule 0211 applies to all fresh surface waters and states that chlorophyll a is not to exceed 40 ug/L.
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Guideline Reference:	Water quality standards table
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected over the time period 2/18/2009-12/10/2009.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 109117, Chlorophyll-a Region 3      Warden Creek
LOE ID:	14530
Pollutant:	Chlorophyll-a
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for Chlorophyll a.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (general objective for biostimulatory substances, Water Quality Control Plan, Central Coast Basin, Chapter III, Section II).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Objective/Criterion Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Objective/Criterion Reference:	Water quality standards table
Evaluation Guideline:	North Carolina Administrative code (NCAC), Title 15A - Environmental and Natural Resources, Subchapter 2B-Surface water and wetland standards, Rule 0211-Fresh surface water quality standards for class C waters (Class C is defined as freshwaters protected for secondary recreation, fishing, aquatic life including propagation and survival, and wildlife). Section 3(a) of Rule 0211 applies to all fresh surface waters and states that chlorophyll a is not to exceed 40 ug/L.
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109117, Chlorophyll-a Region 3      Warden Creek
LOE ID:	13417
Pollutant:	Chlorophyll-a
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Aquatic Life Use:	Warm Freshwater Habitat
Number of Samples:	8
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCAMP Santa Lucia (SantaLucia) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 8 samples exceed the criterion for Chlorophyll a.
Data Reference:	Final Data File used for assessment: CCAMP Water Quality Data_file1
	Final Data File used for assessment: CCAMP Water Quality Data_file2
	Final Data File used for assessment: CCAMP Water Quality Data_file3
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (general objective for biostimulatory substances, Water Quality Control Plan, Central Coast Basin, Chapter III, Section II).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Objective/Criterion Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Objective/Criterion Reference:	Water quality standards table
Evaluation Guideline:	North Carolina Administrative code (NCAC), Title 15A - Environmental and Natural Resources, Subchapter 2B-Surface water and wetland standards, Rule 0211-Fresh surface water quality standards for class C waters (Class C is defined as freshwaters protected for secondary recreation, fishing, aquatic life including propagation and survival, and wildlife). Section 3(a) of Rule 0211 applies to all fresh surface waters and states that chlorophyll a is not to exceed 40 ug/L.
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR-Warden Creek at Turi Road]
Temporal Representation:	Data was collected over the time period 2/14/2002-3/4/2003. Santa Lucia Coast is one of five annual rotation areas that are monitored for conventional pollutants by CCAMP staff monthly for one year.
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 109117, Chlorophyll-a Region 3      Warden Creek
LOE ID:	48917
Pollutant:	Chlorophyll-a
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Warm Freshwater Habitat
Number of Samples:	22
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Water Board Staff assessed public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 22 samples exceed the criterion for Chlorophyll a.
Data Reference:	Data from Region 3 Conditional Waiver Cooperative Monitoring Program, Jan. 2007-Jun. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (general objective for biostimulatory substances, Water Quality Control Plan, Central Coast Basin, Chapter III, Section II).
Objective/Criterion Reference:	Water Quality Control Plan for the Central Coastal Basin
Evaluation Guideline:	North Carolina Administrative code (NCAC), Title 15A - Environmental and Natural Resources, Subchapter 2B-Surface water and wetland standards, Rule 0211-Fresh surface water quality standards for class C waters (Class C is defined as freshwaters protected for secondary recreation, fishing, aquatic life including propagation and survival, and wildlife). Section 3(a) of Rule 0211 applies to all fresh surface waters and states that chlorophyll a is not to exceed 40 ug/L.
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Guideline Reference:	Water quality standards table
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek]
Temporal Representation:	Data was collected over the time period 1/31/2007-3/31/2010.
Environmental Conditions:	Central Coast Water Board Staff are not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). All data are flagged as appropriate.
QAPP Information Reference(s):	Quality Assurance Project Plan for Monitoring for the Region 3 Conditional Ag Waiver Cooperative Monitoring Program, Revision 6
Line of Evidence (LOE) for Decision ID 109117, Chlorophyll-a Region 3      Warden Creek
LOE ID:	14529
Pollutant:	Chlorophyll-a
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	11
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Central Coast Regional Board Staff assessed CCWQP Southern Area Ag-Waiver Monitoring (R3_CMPSouth) data for Warden Creek to determine beneficial use support and results are as follows: 0 of 11 samples exceed the criterion for Chlorophyll a.
Data Reference:	Final Data File used for assessment: Central Coast Water Quality Preservation Inc toxicity data
	Final Data File used for assessment: Central Coast Water Quality Preservation Inc water quality data
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect beneficial uses (general objective for biostimulatory substances, Water Quality Control Plan, Central Coast Basin, Chapter III, Section II).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3)
Objective/Criterion Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Objective/Criterion Reference:	Water quality standards table
Evaluation Guideline:	North Carolina Administrative code (NCAC), Title 15A - Environmental and Natural Resources, Subchapter 2B-Surface water and wetland standards, Rule 0211-Fresh surface water quality standards for class C waters (Class C is defined as freshwaters protected for secondary recreation, fishing, aquatic life including propagation and survival, and wildlife). Section 3(a) of Rule 0211 applies to all fresh surface waters and states that chlorophyll a is not to exceed 40 ug/L.
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Guideline Reference:	North Carolina standards, criteria, or toxic concentrations. Adopted per title 15A North Carolina Administrative Code subchapter 2B - Surface water and wetland standards
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310WRP - Warden Creek, above Los Osos Creek]
Temporal Representation:	Data was collected over the time period 2/24/2006-12/14/2006. Cooperative Monitoring Program (CMP) staff conduct monitoring for conventional pollutants at all Ag Waiver monitoring sites monthly. CMP staff also conduct water toxicity monitoring quarterly and sediment toxicity monitoring annually (in spring).
Environmental Conditions:	Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information:	All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the Cooperative Monitoring Program QAPP, (Clark and Ogle 2006). QA data are included in submission. All data are flagged as appropriate.
QAPP Information Reference(s):

DECISION ID	83537	Region 3
Warden Creek

Pollutant:	Enterococcus
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.3 of the Listing Policy. Under section 3.3 a single line of evidence is necessary to assess listing status. The sample size for the evaluation guideline for water contact recreation for Enterococcus is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 26 samples is needed to determine if a beneficial use is supported and a minimum of five exceedances is needed to determine if beneficial uses are not supported using Table 3.2. Therefore, the use support rating is set to 'insufficient information'. One line of evidence is available in the administrative record to assess this pollutant. Zero of 1 samples exceed the evaluation guideline (USEPA Ambient Water Quality Criteria for Bacteria -1986) set to protect for water contact recreation (i.e. swimming, wading etc.). Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of 1 samples exceed the evaluation guideline set to protect for water contact recreation (i.e. swimming, wading etc.) and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 83537, Enterococcus Region 3      Warden Creek
LOE ID:	47854
Pollutant:	Enterococcus
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PATHOGEN MONITORING
Data Used to Assess Water Quality:	Region 3 - Central Coast Region staff assessed R3 public submissions data for Warden Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Enterococci.
Data Reference:	Data from Morro Bay National Estuary Program's Volunteer Monitoring Program, May 2002-Apr. 2010
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	USEPA Ambient Water Quality Criteria for Bacteria -1986.
Objective/Criterion Reference:	Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
Evaluation Guideline:	Single sample maximum allowable density for Enterococci in marine waters is 104 MPN/100mL (as stated in Table 4, page 15 of the USEPA Ambient Water Quality Criteria for Bacteria -1986).
Guideline Reference:	Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
Spatial Representation:	Data for this line of evidence for Warden Creek was collected at 1 monitoring site [ 310TUR - Warden Creek at Turri Road]
Temporal Representation:	Data was collected on a single day 2/6/2008 8:17:00 AM.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	All data was collected in compliance with an EPA approved QAPP
QAPP Information Reference(s):	Quality Assurance Project Plan for Morro Bay National Estuary Program¿s Volunteer Monitoring Program. Jan. 12, 2010, Version 5, Draft 2