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

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name: Doran Regional Park
Water Body ID: CAC1152100020070319151205
Water Body Type: Coastal & Bay Shoreline
 
DECISION ID
78022
Region 1     
Doran Regional Park
 
Pollutant: Indicator Bacteria
Final Listing Decision: Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Delist from 303(d) list (TMDL required list)(2016)
Revision Status Original
Reason for Delisting: Applicable WQS attained; reason for recovery unspecified
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Fecal indicator bacteria (which includes enterococcus, fecal coliform, and total coliform) are being considered for listing in the CWA Section 303(d) list under Section 3.3 of the Listing Policy. Under this section a single line of evidence (LOE) is necessary to assess listing status. Five LOEs are available in the administrative record to assess indicator bacteria in this water body for the attainment of water contact recreation (REC-1) standards. Additionally, one LOE is available for total coliform for the attainment of shellfish harvesting (SHELL) standards.

Data from LOE 44729 were re-evaluated with LOE 133681. Data from LOEs 344 and 32707 were re-evaluated with LOE 133697. Data from LOE 8885 and 46780 were re-evaluated using LOEs 133681 and 133697. LOE 344 was not used in assessment as the data were assessed under a standard that has since been superseded (California Ocean Plan, 2018). Data from LOE 8882 were re-evaluated with LOE 46781. Data from LOEs 47625 and 47626 were re-evaluated with LOE 133605.

In accordance with Section 3.3 of the Listing Policy, a 4% exceedance rate shall be used to add waters to the List "if water quality monitoring was conducted April 1 through October 31 only." However, data exist outside of that date range; therefore a 10% exceedance rate shall be used to assess this waterbody, per Section 3.3 of the Listing Policy. LOEs 133697 and 133681 were not used in this assessment as they were evaluated at a 4% exceedance rate.

The following summary presents the total number of exceedances and total sample count from the listing cycles combined: 1) 8 of 116 samples exceed the Statistical Threshold Value (STV) objective for enterococcus; 2) 6 of 376 samples exceed the geometric mean objective for enterococcus; 3) 0 of 181 samples exceed the single sample maximum objective for fecal coliform; 4) 0 of 117 samples exceed the geometric mean objective for fecal coliform. For assessing SHELL beneficial use, 10 of 463 samples exceed the median concentration objective for total coliform.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against adding this water segment-pollutant combination to the CWA Section 303(d) list. This conclusion is based on the staff findings that: (1) The data used satisfy the data quality requirements of Section 6.1.4 of the Policy. (2) The data used satisfy the data quantity requirements of Section 6.1.5 of the Policy. (3) Enterococcus, fecal coliform, and total coliform samples do not exceed the objectives more than the allowable frequency identified in Sections 3.3 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. All beneficial uses are full supported in this waterbody.
 
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:
 
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 8882
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 66
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: None of the 66 single samples of fecal coliform collected during the months of April ¿ October at Doran Regional Park Beach exceed the objective. Additionally, none of the 14 30-day geomean values exceed the objective. The single sample and geomean values are two different matrices used to analyzed the same data. Samples were collected by the Sonoma County Division of Environmental Health in accordance with AB411 (Chapter 765, Statutes of 1997) requirements. Data is maintained by the State Water Board's Beach Watch program. Data is summarized by the North Coast Regional Water Board (NCRWQCB 2007).
Data Reference: North Coast Beach Watch Data. Bacteria data collected by Del Norte County, Humboldt County, Mendocino County Environmental Health Division, Sonoma County Division of Environmental Health, and Marin County in accordance with AB411. Data managed by the State Water Resources Control Board's Beach Watch program at beachwatch.waterboards.ca.gov. Includes data from 2004 to 2006
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Ocean Plan (SWRCB 2005): The following bacterial objectives shall be maintained throughout the water column. The following standard is based on the 30-day geometric mean of the five most recent samples from each site: Fecal coliform density shall not exceed 200 MPN per 100 ml. The following standard is for the single sample maximum: Fecal coliform density shall not exceed 400 per 100ml. *Note: MPN is the most probable number of coliform units.
Objective/Criterion Reference: Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Doran Regional Park Beach.
Temporal Representation: Samples were collected weekly from April through October 2005 and from April through October 2006.
Environmental Conditions: Samples were collected during the dry season. Otherwise, there are no known environmental conditions (e.g., land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Samples were collected in accordance with the procedures described in "Environmental Health Policy and Procedure No. 00-1" (Krug 2000).
QAPP Information Reference(s): Environmental Health Policy and Procedure No. 00-1. Subject: Ocean Water Sampling Program Procedures. County of Sonoma Department of Health Services
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 133606
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 376
Number of Exceedances: 6
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed Beachwatch_Sonoma County data for Doran Regional Park to determine beneficial use support and the results are as follows: 6 of the 376 samples exceeded the geomean water quality standard for Enterococcus. This is a six week rolling geomean that is calculated weekly.
Data Reference: Sonoma County Beachwatch data reformatted to match CEDEN fields.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial for all ocean waters , is a six-week rolling GM of Enterococci not to exceed 30 cfu/100mL (calculated weekly).
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): Doran Park
Temporal Representation: The samples were collected between the days of 1999-08-10 and 2017-05-01 .
Environmental Conditions:
QAPP Information: Data exempt from QAPP requirement. Draft QAPP for Sonoma County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.
QAPP Information Reference(s): Draft QAPP for Sonoma County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 32709
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 103
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the 103 geomeans exceeded the objective.
Data Reference: Data for Region 1 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The geometric mean standard for fecal coliform states that the coliform density shall not exceed 200 MPN per 100 mL. Water Quality Control Plan for Ocean Waters (SWRCB 2009).
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Doran Regional Park.
Temporal Representation: Samples were collected approximately once a week from 2007 to 2010.
Environmental Conditions:
QAPP Information: The samples were collected for the beach watch program.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 44592
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 115
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: 0 of 115 samples exceed the criterion for Fecal Coliform.
Data Reference: Data for Region 1 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2009) states that the single sample maximum for fecal coliform shall not exceed 400 MPN/100 mL
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Doran Regional Park was collected at 1 monitoring site [ Doran Park County Regional Park]
Temporal Representation: Data was collected over the time period 4/2/2007-2/16/2010.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The samples were collected for the Beach Watch program.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 8885
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 66
Number of Exceedances: 2
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Two of the 66 single samples of enterococcus collected during the months of April ¿ October at Doran Regional Park Beach exceed the objective. Additionally, none of the 14 30-day geomean values exceed the objective. The single sample and geomean values are two different matrices used to analyzed the same data. Samples were collected by the Sonoma County Division of Environmental Health in accordance with AB411 (Chapter 765, Statutes of 1997) requirements. Data is maintained by the State Water Board's Beach Watch program. Data is summarized by the North Coast Regional Water Board (NCRWQCB 2007).
Data Reference: North Coast Beach Watch Data. Bacteria data collected by Del Norte County, Humboldt County, Mendocino County Environmental Health Division, Sonoma County Division of Environmental Health, and Marin County in accordance with AB411. Data managed by the State Water Resources Control Board's Beach Watch program at beachwatch.waterboards.ca.gov. Includes data from 2004 to 2006
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Ocean Plan (SWRCB 2005): The following bacterial objectives shall be maintained throughout the water column. The following standard is based on the 30-day geometric mean of the five most recent samples from each site: Enterococcus density shall not exceed 35 MPN per 100ml. The following standard is for the single sample maximum: Enterococcus density shall not exceed 104 per 100 ml. *Note: MPN is the most probable number of coliform units.
Objective/Criterion Reference: Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Doran Regional Park Beach.
Temporal Representation: Samples were collected weekly from April through October 2005 and from April through October 2006.
Environmental Conditions: Samples were collected during the dry season. Otherwise, there are no known environmental conditions (e.g., land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Samples were collected in accordance with the procedures described in "Environmental Health Policy and Procedure No. 00-1" (Krug 2000).
QAPP Information Reference(s): Environmental Health Policy and Procedure No. 00-1. Subject: Ocean Water Sampling Program Procedures. County of Sonoma Department of Health Services
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 46780
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 66
Number of Exceedances: 2
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Two of the 66 single samples of enterococcus collected during the months of April ¿ December 2005 and April - October 2006 at Doran Regional Park Beach exceed the objective. Additionally, none of the 14 30-day geomean values exceed the objective. The single sample and geomean values are two different matrices used to analyzed the same data. Samples were collected by the Sonoma County Division of Environmental Health in accordance with AB411 (Chapter 765, Statutes of 1997) requirements. Data is maintained by the State Water Board's Beach Watch program. Data is summarized by the North Coast Regional Water Board (NCRWQCB 2007). This LOE replaces LOE 8885. This LOE has clarified that data were collected April - December 2005 (not April - October 2005).
Data Reference: North Coast Beach Watch Data. Bacteria data collected by Del Norte County, Humboldt County, Mendocino County Environmental Health Division, Sonoma County Division of Environmental Health, and Marin County in accordance with AB411. Data managed by the State Water Resources Control Board's Beach Watch program at beachwatch.waterboards.ca.gov. Includes data from 2004 to 2006
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Ocean Plan (SWRCB 2005): The following bacterial objectives shall be maintained throughout the water column. The following standard is based on the 30-day geometric mean of the five most recent samples from each site: Enterococcus density shall not exceed 35 MPN per 100ml. The following standard is for the single sample maximum: Enterococcus density shall not exceed 104 per 100 ml. *Note: MPN is the most probable number of coliform units.
Objective/Criterion Reference: Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Doran Regional Park Beach.
Temporal Representation: Samples were collected weekly from April through December 2005 and from April
through October 2006.
Environmental Conditions: Samples were collected during the dry season. Otherwise, there are no known environmental conditions (e.g., land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Samples were collected in accordance with the procedures described in "Environmental Health Policy and Procedure No. 00-1" (Krug 2000).
QAPP Information Reference(s): Environmental Health Policy and Procedure No. 00-1. Subject: Ocean Water Sampling Program Procedures. County of Sonoma Department of Health Services
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 133605
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Shellfish Harvesting
 
Number of Samples: 463
Number of Exceedances: 10
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed Beachwatch_Sonoma County data for Doran Regional Park to determine beneficial use support and the results are as follows: 10 of the 463 samples exceeded the water quality standard for Coliform, Total. The water quality standard for shellfish is based on the median concentration of Total Coliform at each station, and is calculated on a monthly basis.
Data Reference: Sonoma County Beachwatch data reformatted to match CEDEN fields.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2018) states that the median concentration of total coliform samples shall not exceed 70 per 100 ml.
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): Doran Park
Temporal Representation: The samples were collected between the days of 1999-08-10 and 2017-05-01 .
Environmental Conditions:
QAPP Information: Data exempt from QAPP requirement. Draft QAPP for Sonoma County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.
QAPP Information Reference(s): Draft QAPP for Sonoma County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 47626
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Shellfish Harvesting
 
Number of Samples: 102
Number of Exceedances: 1
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: 1 of 102 samples exceed the objective of 70 MPN/100mL applied as a rolling 30 day geomean for Total Coliform.
Data Reference: Data for Region 1 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Ocean Plan states that at all areas where shellfish may be harvested for human consumption, the median total coliform density shall not exceed 70 per 100 mL. Staff applied the objective as a rolling 30 day geometric mean consistent with other state bacteria objectives and with guidance from the National Shellfish Sanitation Program from which the objectives were taken.
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Doran Regional Park was collected at 1 monitoring site [Doran Park County Regional Park]
Temporal Representation: Data was collected over the time period 4/2/2007-2/16/2010.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The samples were collected for the Beach Watch program.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 47625
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Shellfish Harvesting
 
Number of Samples: 114
Number of Exceedances: 2
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: 2 of 114 samples exceed the objective of 230 MPN/100mL applied as a single sample maximum for Total Coliform.
Data Reference: Data for Region 1 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The California Ocean Plan states the following: At all areas where shellfish may be harvested for human consumption, the following bacterial objectives shall be maintained throughout the water column: Ten percent of the samples collected during any 30-day period shall not exceed 230 MPN/100mL.
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Doran Regional Park was collected at 1 monitoring site [Doran Park County Regional Park]
Temporal Representation: Data was collected over the time period 4/2/2007-2/16/2010.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The samples were collected for the Beach Watch program.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 344
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 119
Number of Exceedances: 5
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Available data indicate sufficient exceedances of bacterial indicator objectives. There were 5 out of 119 samples that exceeded the geomean for enterococci(USEPA, 2007).
Data Reference: Placeholder reference 2006 303(d)
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Title 17 C.C.R. Section 7958 states: Based on a single sample, the density of bacteria in water from each sampling station at a public beach or public water contact sports area shall not exceed:
(A) 1,000 total coliform bacteria per 100 milliliters, if the ratio of fecal/total coliform bacteria exceeds 0.1; or
(B) 10,000 total coliform bacteria per 100 milliliters; or
(C) 400 fecal coliform bacteria per 100 milliliters; or
(D) 104 enterococcus bacteria per 100 milliliters.

Based on the mean of the logarithms of the results of at least five weekly samples during any 30-day sampling period, the density of bacteria in water from any sampling station at a public beach or public water contact sports area, shall not exceed:
(A) 1,000 total coliform bacteria per 100 milliliters; or
(B) 200 fecal coliform bacteria per 100 milliliters; or
(C) 35 enterococcus bacteria per 100 milliliters. (DHS, 1999)
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Station ID# SON70
Temporal Representation: 4/02/2001-10/24/2005
Environmental Conditions:
QAPP Information: Data record: summers 2001-2005, Sonoma County Health Dept.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 32707
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 103
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the 103 geomeans exceeded the objective.
Data Reference: Data for Region 1 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The geometric mean standard for entercoccus states that the entercoccus density shall not exceed 35 per 100 mL. Water Quality Control Plan for Ocean Waters 2009.
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Doran Regional Park.
Temporal Representation: Samples were collected approximately once a week from 2007 to 2010.
Environmental Conditions:
QAPP Information: The samples were collected for the Beach Watch program.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 133697
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 346
Number of Exceedances: 6
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed Beachwatch_Sonoma County data for Doran Regional Park to determine beneficial use support and the results are as follows: 6 of the 346 samples exceeded the geomean water quality standard for Enterococcus. This is a six week rolling geomean that is calculated weekly. This data is for an AB411 beach. This LOE specifically corresponds with dry weather samples and only includes samples collected between April 1 and October 31 of each year.
Data Reference: Sonoma County Beachwatch data reformatted to match CEDEN fields.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial for all ocean waters , is a six-week rolling GM of Enterococci not to exceed 30 cfu/100mL (calculated weekly).
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): Doran Park
Temporal Representation: The samples were collected between the days of 1999-08-10 and 2017-05-01 .
Environmental Conditions:
QAPP Information: Data exempt from QAPP requirement. Draft QAPP for Sonoma County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.
QAPP Information Reference(s): Draft QAPP for Sonoma County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 133681
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 107
Number of Exceedances: 8
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed Beachwatch_Sonoma County data for Doran Regional Park to determine beneficial use support and the results are as follows: 8 of the 107 samples exceeded the Statistical Threshold Value (STV) water quality standard for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly. This data is for an AB411 beach. This LOE specifically corresponds with dry weather samples and only includes samples collected between April 1 and October 31 of each year.
Data Reference: Sonoma County Beachwatch data reformatted to match CEDEN fields.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial for all ocean waters, is a Statistical Threshold Value (STV) of 110 cfu/100 mL not to be exceeded more than 10 percent of the time (calculated monthly).
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): Doran Park
Temporal Representation: The samples were collected between the days of 1999-08-10 and 2017-05-01 .
Environmental Conditions:
QAPP Information: Data exempt from QAPP requirement. Draft QAPP for Sonoma County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.
QAPP Information Reference(s): Draft QAPP for Sonoma County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 44729
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 115
Number of Exceedances: 1
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: 1 of 115 samples exceed the criterion for Enterococci.
Data Reference: Data for Region 1 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2009) states that the single sample maximum for Enterococcus shall not exceed 104 MPN/100 mL.
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Data for this line of evidence for Doran Regional Park was collected at 1 monitoring site [ Doran Park County Regional Park]
Temporal Representation: Data was collected over the time period 4/2/2007-2/16/2010.
Environmental Conditions: Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information: The samples were collected for the Beach Watch program.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 133609
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 116
Number of Exceedances: 8
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed Beachwatch_Sonoma County data for Doran Regional Park to determine beneficial use support and the results are as follows: 8 of the 116 samples exceeded the Statistical Threshold Value (STV) water quality standard for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.
Data Reference: Sonoma County Beachwatch data reformatted to match CEDEN fields.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial for all ocean waters, is a Statistical Threshold Value (STV) of 110 cfu/100 mL not to be exceeded more than 10 percent of the time (calculated monthly).
Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): Doran Park
Temporal Representation: The samples were collected between the days of 1999-08-10 and 2017-05-01 .
Environmental Conditions:
QAPP Information: Data exempt from QAPP requirement. Draft QAPP for Sonoma County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP.
QAPP Information Reference(s): Draft QAPP for Sonoma County Beachwatch. Represents data collection procedure prior to development of a formal QAPP.
 
Line of Evidence (LOE) for Decision ID 78022, Indicator Bacteria
Region 1     
Doran Regional Park
 
LOE ID: 46781
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 66
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: None of the 66 single samples of fecal coliform collected during the months of April ¿ December 2005 and April - October 2006 at Doran Regional Park Beach exceed the objective. Additionally, none of the 14 30-day geomean values exceed the objective. The single sample and geomean values are two different matrices used to analyzed the same data. Samples were collected by the Sonoma County Division of Environmental Health in accordance with AB411 (Chapter 765, Statutes of 1997) requirements. Data is maintained by the State Water Board's Beach Watch program. Data is summarized by the North Coast Regional Water Board (NCRWQCB 2007). This LOE replaces LOE 8882. This LOE has clarified that data were collected April - December 2005 (not April - October 2005).
Data Reference: North Coast Beach Watch Data. Bacteria data collected by Del Norte County, Humboldt County, Mendocino County Environmental Health Division, Sonoma County Division of Environmental Health, and Marin County in accordance with AB411. Data managed by the State Water Resources Control Board's Beach Watch program at beachwatch.waterboards.ca.gov. Includes data from 2004 to 2006
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Per the Ocean Plan (SWRCB 2005): The following bacterial objectives shall be maintained throughout the water column. The following standard is based on the 30-day geometric mean of the five most recent samples from each site: Fecal coliform density shall not exceed 200 MPN per 100 ml. The following standard is for the single sample maximum: Fecal coliform density shall not exceed 400 per 100ml. *Note: MPN is the most probable number of coliform units.
Objective/Criterion Reference: Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at Doran Regional Park Beach.
Temporal Representation: Samples were collected weekly from April through December 2005 and from April through October 2006.
Environmental Conditions: Samples were collected during the dry season. Otherwise, there are no known environmental conditions (e.g., land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information: Samples were collected in accordance with the procedures described in "Environmental Health Policy and Procedure No. 00-1" (Krug 2000).
QAPP Information Reference(s): Environmental Health Policy and Procedure No. 00-1. Subject: Ocean Water Sampling Program Procedures. County of Sonoma Department of Health Services