Final California 2024 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 2 - San Francisco Bay Region

Water Body Name: Pacific Ocean at Rodeo Beach
Water Body ID: CAC2013001420110712221914
Water Body Type: Coastal & Bay Shoreline
 
DECISION ID
148623
Region 2     
Pacific Ocean at Rodeo Beach
 
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)(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 3.2 of the Listing Policy.

Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for conventional or other pollutants (Table 3.2 of the Listing Policy).

The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.

Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. 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.
 
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 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 300284
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: GeoMean
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a 30-Day rolling geomean. 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: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial use in ocean waters applies a 30 day geometric mean of fecal coliform based on the five most recent samples at each site, not to exceed 200 per 100 mL. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - NORTH (RODEO BEACH - NORTH-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2015-09-08 and 2015-10-27 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program
 
Line of Evidence (LOE) for Decision ID 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 300285
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: SSM
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 0 of the 8 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a Single Sample Maximum (SSM) value that is calculated daily. 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: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial use in ocean waters applies a single sample maximum of fecal coliform, not to exceed 400 per 100 mL. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - SOUTH (RODEO BEACH - SOUTH-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2015-09-08 and 2015-10-27 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program
 
Line of Evidence (LOE) for Decision ID 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 300110
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: GeoMean
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 178
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 0 of the 178 samples exceeded the geomean water quality threshold for Enterococcus. This is a six week rolling geomean that is calculated weekly.
Data Reference: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial in ocean waters applies a six-week rolling geomean to enterococcus, not to exceed 30 cfu/100mL. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - SOUTH (RODEO BEACH - SOUTH-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2010-09-08 and 2020-10-15 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program
 
Line of Evidence (LOE) for Decision ID 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 299556
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: STV
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 58
Number of Exceedances: 1
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 1 of the 58 samples exceeded the Statistical Threshold Value (STV) water quality threshold for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.
Data Reference: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial use in ocean waters, applies a Statistical Threshold Value to enterococcus of 110 cfu/100 mL, not to be exceeded by more than 10 percent of samples collected within in a calendar month. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - CENTRAL (RODEO BEACH - CENTRAL-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2010-10-13 and 2020-10-15 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program
 
Line of Evidence (LOE) for Decision ID 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 299813
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: GeoMean
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 177
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 0 of the 177 samples exceeded the geomean water quality threshold for Enterococcus. This is a six week rolling geomean that is calculated weekly.
Data Reference: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial in ocean waters applies a six-week rolling geomean to enterococcus, not to exceed 30 cfu/100mL. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - CENTRAL (RODEO BEACH - CENTRAL-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2010-10-13 and 2020-10-15 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program
 
Line of Evidence (LOE) for Decision ID 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 299979
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: STV
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 62
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 0 of the 62 samples exceeded the Statistical Threshold Value (STV) water quality threshold for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.
Data Reference: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial use in ocean waters, applies a Statistical Threshold Value to enterococcus of 110 cfu/100 mL, not to be exceeded by more than 10 percent of samples collected within in a calendar month. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - SOUTH (RODEO BEACH - SOUTH-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2010-09-08 and 2020-10-15 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program
 
Line of Evidence (LOE) for Decision ID 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 300131
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: GeoMean
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 178
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 0 of the 178 samples exceeded the geomean water quality threshold for Enterococcus. This is a six week rolling geomean that is calculated weekly.
Data Reference: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial in ocean waters applies a six-week rolling geomean to enterococcus, not to exceed 30 cfu/100mL. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - NORTH (RODEO BEACH - NORTH-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2010-09-08 and 2020-10-15 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program
 
Line of Evidence (LOE) for Decision ID 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 300154
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: STV
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 64
Number of Exceedances: 1
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 1 of the 64 samples exceeded the Statistical Threshold Value (STV) water quality threshold for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.
Data Reference: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial use in ocean waters, applies a Statistical Threshold Value to enterococcus of 110 cfu/100 mL, not to be exceeded by more than 10 percent of samples collected within in a calendar month. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - NORTH (RODEO BEACH - NORTH-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2010-09-08 and 2020-10-15 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program
 
Line of Evidence (LOE) for Decision ID 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 90763
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 122
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the 122 geomeans exceeded the fecal coliform objective.
Data Reference: Data for Region 2 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The geometric mean standard for fecal coliform states that the enterococcus density shall not exceed 200 per 100 mL. Water Quality Control Plan for Ocean Waters 2009.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at station Rodeo Beach - North.
Temporal Representation: Samples were collected approximately once a week from April 2005 to September 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 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 90525
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 139
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the 139 geomeans exceeded the fecal coliform objective.
Data Reference: Data for Region 2 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The geometric mean standard for fecal coliform states that the density shall not exceed 200 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 stations Rodeo Beach - Central and Rodeo Beach - South. The results from the central and south stations were averaged because they were located within 200 meters.
Temporal Representation: Samples were collected approximately once a week from April 2005 to September 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 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 90767
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 153
Number of Exceedances: 1
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: One of the 153 samples exceeded the fecal coliform objective.
Data Reference: Data for Region 2 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The standard for fecal coliform states that the density shall not exceed 400 per 100 mL. Water Quality Control Plan for Ocean Waters 2009.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at station Rodeo Beach - North.
Temporal Representation: Samples were collected approximately once a week from April 2005 to September 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 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 90766
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 168
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the 168 samples exceeded the fecal coliform objective.
Data Reference: Data for Region 2 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The standard for fecal coliform states that the density shall not exceed 200 per 100 mL. Water Quality Control Plan for Ocean Waters 2009.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at stations Rodeo Beach - Central and Rodeo Beach - South. The results from the central and south stations were averaged because they were located within 200 meters.
Temporal Representation: Samples were collected approximately once a week from April 2005 to September 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 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 90527
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 139
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the 139 geomeans exceeded the entercoccus objective.
Data Reference: Data for Region 2 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The geometric mean standard for entercoccus states that the enterococcus 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 stations Rodeo Beach - Central and Rodeo Beach - South. The results from the central and south stations were averaged because they were located within 200 meters.
Temporal Representation: Samples were collected approximately once a week from April 2005 to September 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 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 300559
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: SSM
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 0 of the 8 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a Single Sample Maximum (SSM) value that is calculated daily. 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: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial use in ocean waters applies a single sample maximum of fecal coliform, not to exceed 400 per 100 mL. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - CENTRAL (RODEO BEACH - CENTRAL-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2015-09-08 and 2015-10-27 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program
 
Line of Evidence (LOE) for Decision ID 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 300542
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: GeoMean
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a 30-Day rolling geomean. 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: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial use in ocean waters applies a 30 day geometric mean of fecal coliform based on the five most recent samples at each site, not to exceed 200 per 100 mL. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - CENTRAL (RODEO BEACH - CENTRAL-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2015-09-08 and 2015-10-27 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program
 
Line of Evidence (LOE) for Decision ID 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 300264
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: GeoMean
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 4
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a 30-Day rolling geomean. 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: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial use in ocean waters applies a 30 day geometric mean of fecal coliform based on the five most recent samples at each site, not to exceed 200 per 100 mL. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - SOUTH (RODEO BEACH - SOUTH-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2015-09-08 and 2015-10-27 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program
 
Line of Evidence (LOE) for Decision ID 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 90765
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 123
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Zero of the 123 geomeans exceeded the entercoccus objective.
Data Reference: Data for Region 2 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The geometric mean standard for entercoccus states that the enterococcus density shall not exceed 35 per 100 mL. Water Quality Control Plan for Ocean Waters 2009.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at station Rodeo Beach - North.
Temporal Representation: Samples were collected approximately once a week from April 2005 to September 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 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 90743
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 168
Number of Exceedances: 2
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Two of the 168 samples exceeded the entercoccus objective.
Data Reference: Data for Region 2 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The standard for entercoccus states that the enterococcus density shall not exceed 104 per 100 mL. Water Quality Control Plan for Ocean Waters 2009.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at stations Rodeo Beach - Central and Rodeo Beach - South. The results from the central and south stations were averaged because they were located within 200 meters.
Temporal Representation: Samples were collected approximately once a week from April 2005 to September 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 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 90744
 
Pollutant: Enterococcus
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 154
Number of Exceedances: 4
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: Four of the 154 samples exceeded the entercoccus objective.
Data Reference: Data for Region 2 Beach Watch.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The standard for entercoccus states that the enterococcus density shall not exceed 104 per 100 mL. Water Quality Control Plan for Ocean Waters 2009.
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Samples were collected at station Rodeo Beach - North.
Temporal Representation: Samples were collected approximately once a week from April 2005 to September 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 148623, Indicator Bacteria
Region 2     
Pacific Ocean at Rodeo Beach
 
LOE ID: 300541
 
Pollutant: Fecal Coliform
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: SSM
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 8
Number of Exceedances: 0
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Water Board staff assessed BeachWatch_Marin County data for Pacific Ocean at Rodeo Beach to determine beneficial use support and the results are as follows: 0 of the 8 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a Single Sample Maximum (SSM) value that is calculated daily. 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: WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 2.
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: The bacteria water quality objective to protect the REC-1 beneficial use in ocean waters applies a single sample maximum of fecal coliform, not to exceed 400 per 100 mL. (Ocean Plan 2019)
Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): RODEO BEACH - NORTH (RODEO BEACH - NORTH-Rodeo Beach, Marin).
Temporal Representation: The samples were collected between the days of 2015-09-08 and 2015-10-27 .
Environmental Conditions:
QAPP Information: State Board Staff. 2021. QAPP Reference for Beach Watch Program.
QAPP Information Reference(s): QAPP Reference for Beach Watch Program