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

Supporting Information

Regional Board 8 - Santa Ana Region

Water Body Name: Muddy Creek
Water Body ID: CAR8011100020011005153621
Water Body Type: River & Stream
 
DECISION ID
96202
Region 8     
Muddy Creek
 
Pollutant: Indicator Bacteria
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 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.
Six (6) lines of evidence are available in the administrative record to assess this pollutant.
Zero (0) of 0 samples exceed the E. coli Geomean Objective.
Zero (0) of 0 samples exceed the E. coli Single Sample Objective.
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 (0) of the 0 samples exceed the E. coli Geomean Objective, and 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 5 samples is needed to determine if a beneficial use is fully supported using Table 3.2.
4. Zero (0) of the 0 samples exceed the E. coli Single Sample Objective, and 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 5 samples is needed to determine if a beneficial use is fully supported using Table 3.2.
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 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 96202, Indicator Bacteria
Region 8     
Muddy Creek
 
LOE ID: 81811
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 21
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch data for Muddy Creek to determine beneficial use support and results are as follows: 0 of 21 samples exceed the criterion for Coliform, Total.
Data Reference: Data for Region 8 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: California Ocean Plan (2009) single sample maximum states that total coliform density shall not exceed 10,000 per 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 Muddy Creek was collected at 1 monitoring site [ Muddy Creek]
Temporal Representation: Data was collected over the time period 2/5/2009-10/27/2009.
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 96202, Indicator Bacteria
Region 8     
Muddy Creek
 
LOE ID: 81810
 
Pollutant: Fecal Coliform
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: Not Specified
Data Used to Assess Water Quality: Zero of the 11 geomeans exceeded the fecal coliform guideline.
Data Reference: Data for Region 8 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The geometric mean for fecal coliform shall not exceed more than 200/100ml. Water Quality Control Plan for the Santa Ana River Basin.
Objective/Criterion Reference: Water Quality Control Plan, Santa Ana River Basin
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at station Muddy Creek.
Temporal Representation: The samples were collected approximately once a month from Febuary 2009 to October 2009.
Environmental Conditions:
QAPP Information: The samples were collected by Orange County Environmental Health for the Beach Watch Program.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 96202, Indicator Bacteria
Region 8     
Muddy Creek
 
LOE ID: 81807
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 22
Number of Exceedances: 2
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch data for Muddy Creek to determine beneficial use support and results are as follows: 2 of 22 samples exceed the criterion for Coliform, Fecal.
Data Reference: Data for Region 8 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2009) single sample maximum states that fecal coliform density shall not exceed 400 per 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 Muddy Creek was collected at 1 monitoring site [ Muddy Creek]
Temporal Representation: Data was collected over the time period 2/5/2009-10/27/2009.
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 96202, Indicator Bacteria
Region 8     
Muddy Creek
 
LOE ID: 81806
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 11
Number of Exceedances: 10
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Ten of the 11 geomeans exceeded the entercoccus guideline.
Data Reference: Data for Region 8 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Water Quality Control Plan for the Santa Ana River Basin.
Objective/Criterion Reference: Water Quality Control Plan, Santa Ana River Basin
 
Evaluation Guideline: The geometric mean for entercoccus shall not exceed more than 33/100ml. USEPA Ambient Water Quality Criteria for Bacteria 1986.
Guideline Reference: Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
 
Spatial Representation: The samples were collected at station Muddy Creek.
Temporal Representation: The samples were collected approximately once a month from Febuary 2009 to October 2009.
Environmental Conditions:
QAPP Information: The samples were collected by Orange County Environmental Health for the Beach Watch Program.
QAPP Information Reference(s):
 
Line of Evidence (LOE) for Decision ID 96202, Indicator Bacteria
Region 8     
Muddy Creek
 
LOE ID: 81803
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 22
Number of Exceedances: 13
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch data for Muddy Creek to determine beneficial use support and results are as follows: 13 of 22 samples exceed the criterion for Enterococci.
Data Reference: Data for Region 8 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2009) single sample maximum states that enterococcus density shall not exceed 104 per 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 Muddy Creek was collected at 1 monitoring site [ Muddy Creek]
Temporal Representation: Data was collected over the time period 2/5/2009-10/27/2009.
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 96202, Indicator Bacteria
Region 8     
Muddy Creek
 
LOE ID: 81814
 
Pollutant: Total Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 9
Number of Exceedances: 9
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Nine of the 9 geomeans exceeded the total coliform guideline.
Data Reference: Data for Region 8 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Water Quality Control Plan for the Santa Ana River Basin.
Objective/Criterion Reference: Water Quality Control Plan, Santa Ana River Basin
 
Evaluation Guideline: The geometric mean for total coliform shall not exceed more than 1000/100ml. Guidance for Fresh Water Beaches (CDPH 2011).
Guideline Reference: Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.
 
Spatial Representation: The samples were collected at station Muddy Creek.
Temporal Representation: The samples were collected approximately once a month from Febuary 2009 to October 2009.
Environmental Conditions:
QAPP Information: The samples were collected by Orange County Environmental Health for the Beach Watch Program.
QAPP Information Reference(s):