Line of Evidence (LOE) for Decision ID 34388, Indicator Bacteria
|
Region 2 |
Chicken Ranch Beach |
|
|
LOE ID: |
95561 |
|
Pollutant: |
Total Coliform |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
139 |
Number of Exceedances: |
13 |
|
Data and Information Type: |
PATHOGEN MONITORING |
Data Used to Assess Water Quality: |
Available data indicate sufficient exceedances of bacterial indicator objectives. There were 13 out of 139 samples that exceeded the single sample maximum for total coliform, 9 out of 140 that exceeded the single sample maximum for fecal coliform, 25 out of 140 that exceeded the single sample maximum for enterococci, and 20 out of 118 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: |
Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2001. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
|
Temporal Representation: |
04/01/2003-10/25/2005 |
Environmental Conditions: |
Staff are not aware of any special environmental conditions associated with sampling. |
QAPP Information: |
Data record: summers 2003-2005, Marin County Health Dept. |
QAPP Information Reference(s): |
|
Line of Evidence (LOE) for Decision ID 34388, Indicator Bacteria
|
Region 2 |
Chicken Ranch Beach |
|
|
LOE ID: |
90640 |
|
Pollutant: |
Total Coliform |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
26 |
Number of Exceedances: |
8 |
|
Data and Information Type: |
Not Specified |
Data Used to Assess Water Quality: |
Eight of the twenty-six monthly medians exceeded the objective. These samples were collected from April to October only and should be assessed with a 4 percent exceedance frequency. |
Data Reference: |
Data for Region 2 Beach Watch. |
|
SWAMP Data: |
Non-SWAMP |
|
Water Quality Objective/Criterion: |
The standard for total coliform states that the coliform density shall not exceed a monthly median of 240 per 100 mL. San Francisco Bay Basin Water Quality Control Plan. |
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 the Chicken Ranch Beach site. |
Temporal Representation: |
Samples were collected from April 2005 to October 2008. |
Environmental Conditions: |
|
QAPP Information: |
The samples were collected for the Beach Watch program. |
QAPP Information Reference(s): |
|
Line of Evidence (LOE) for Decision ID 34388, Indicator Bacteria
|
Region 2 |
Chicken Ranch Beach |
|
|
LOE ID: |
90811 |
|
Pollutant: |
Total Coliform |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
107 |
Number of Exceedances: |
1 |
|
Data and Information Type: |
PATHOGEN MONITORING |
Data Used to Assess Water Quality: |
Water Board staff assessed BeachWatch data for Chicken Ranch Beach to determine beneficial use support and results are as follows: 1 of 107 samples exceed the criterion for Coliform, Total. |
Data Reference: |
Data for Region 2 Beach Watch. |
|
SWAMP Data: |
Non-SWAMP |
|
Water Quality Objective/Criterion: |
The San Francisco Bay Basin Plan states that the single sample maximum for total coliform shall not exceed 10,000 MPN/100 mL |
Objective/Criterion Reference: |
Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Data for this line of evidence for Chicken Ranch Beach was collected at 1 monitoring site [ Chicken Ranch Beach at Creek] |
Temporal Representation: |
Data was collected over the time period 4/5/2005-10/28/2008. |
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 34388, Indicator Bacteria
|
Region 2 |
Chicken Ranch Beach |
|
|
LOE ID: |
95563 |
|
Pollutant: |
Enterococcus |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
140 |
Number of Exceedances: |
25 |
|
Data and Information Type: |
PATHOGEN MONITORING |
Data Used to Assess Water Quality: |
Available data indicate sufficient exceedances of bacterial indicator objectives. There were 13 out of 139 samples that exceeded the single sample maximum for total coliform, 9 out of 140 that exceeded the single sample maximum for fecal coliform, 25 out of 140 that exceeded the single sample maximum for enterococci, and 20 out of 118 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: |
Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2001. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
|
Temporal Representation: |
04/01/2003-10/25/2005 |
Environmental Conditions: |
Staff are not aware of any special environmental conditions associated with sampling. |
QAPP Information: |
Data record: summers 2003-2005, Marin County Health Dept. |
QAPP Information Reference(s): |
|
Line of Evidence (LOE) for Decision ID 34388, Indicator Bacteria
|
Region 2 |
Chicken Ranch Beach |
|
|
LOE ID: |
90839 |
|
Pollutant: |
Enterococcus |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
107 |
Number of Exceedances: |
7 |
|
Data and Information Type: |
PATHOGEN MONITORING |
Data Used to Assess Water Quality: |
Water Board staff assessed BeachWatch data for Chicken Ranch Beach to determine beneficial use support and results are as follows: 7 of 107 samples exceed the criterion for Enterococci. |
Data Reference: |
Data for Region 2 Beach Watch. |
|
SWAMP Data: |
Non-SWAMP |
|
Water Quality Objective/Criterion: |
The San Francisco Bay Basin Plan states that the single sample maximum for Enterococcus shall not exceed 104 MPN/100 mL. |
Objective/Criterion Reference: |
Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Data for this line of evidence for Chicken Ranch Beach was collected at 1 monitoring site [ Chicken Ranch Beach at Creek] |
Temporal Representation: |
Data was collected over the time period 4/5/2005-10/28/2008. |
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 34388, Indicator Bacteria
|
Region 2 |
Chicken Ranch Beach |
|
|
LOE ID: |
90639 |
|
Pollutant: |
Enterococcus |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
89 |
Number of Exceedances: |
5 |
|
Data and Information Type: |
Not Specified |
Data Used to Assess Water Quality: |
Five of the 89 geomeans exceeded the 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 entercoccus density shall not exceed 35 per 100 mL. San Francisco Bay Basin Water Quality Control Plan. |
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 the Chicken Ranch Beach site. |
Temporal Representation: |
Samples were collected from April 2005 to October 2008. |
Environmental Conditions: |
|
QAPP Information: |
The samples were collected for the Beach Watch program. |
QAPP Information Reference(s): |
|
Line of Evidence (LOE) for Decision ID 34388, Indicator Bacteria
|
Region 2 |
Chicken Ranch Beach |
|
|
LOE ID: |
95564 |
|
Pollutant: |
Enterococcus |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
118 |
Number of Exceedances: |
20 |
|
Data and Information Type: |
PATHOGEN MONITORING |
Data Used to Assess Water Quality: |
Available data indicate sufficient exceedances of bacterial indicator objectives. There were 13 out of 139 samples that exceeded the single sample maximum for total coliform, 9 out of 140 that exceeded the single sample maximum for fecal coliform, 25 out of 140 that exceeded the single sample maximum for enterococci, and 20 out of 118 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: |
Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2001. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
|
Temporal Representation: |
04/01/2003-10/25/2005 |
Environmental Conditions: |
Staff are not aware of any special environmental conditions associated with sampling. |
QAPP Information: |
Data record: summers 2003-2005, Marin County Health Dept. |
QAPP Information Reference(s): |
|
Line of Evidence (LOE) for Decision ID 34388, Indicator Bacteria
|
Region 2 |
Chicken Ranch Beach |
|
|
LOE ID: |
90641 |
|
Pollutant: |
Fecal Coliform |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
89 |
Number of Exceedances: |
0 |
|
Data and Information Type: |
Not Specified |
Data Used to Assess Water Quality: |
Zero of the 89 geomeans exceeded the 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 fecal coliform density shall not exceed 200 per 100 mL. San Francisco Bay Basin Water Quality Control Plan. |
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 the Chicken Ranch Beach site. |
Temporal Representation: |
Samples were collected from April 2005 to October 2008. |
Environmental Conditions: |
|
QAPP Information: |
The samples were collected for the beach watch program. |
QAPP Information Reference(s): |
|
Line of Evidence (LOE) for Decision ID 34388, Indicator Bacteria
|
Region 2 |
Chicken Ranch Beach |
|
|
LOE ID: |
90786 |
|
Pollutant: |
Fecal Coliform |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
107 |
Number of Exceedances: |
1 |
|
Data and Information Type: |
PATHOGEN MONITORING |
Data Used to Assess Water Quality: |
Water Board staff assessed BeachWatch data for Chicken Ranch Beach to determine beneficial use support and results are as follows: 1 of 107 samples exceed the criterion for Coliform, Fecal. |
Data Reference: |
Data for Region 2 Beach Watch. |
|
SWAMP Data: |
Non-SWAMP |
|
Water Quality Objective/Criterion: |
The San Francisco Bay Basin Plan states that the single sample maximum for fecal coliform shall not exceed 400 MPN/100 mL |
Objective/Criterion Reference: |
Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Data for this line of evidence for Chicken Ranch Beach was collected at 1 monitoring site [ Chicken Ranch Beach at Creek] |
Temporal Representation: |
Data was collected over the time period 4/5/2005-10/28/2008. |
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 34388, Indicator Bacteria
|
Region 2 |
Chicken Ranch Beach |
|
|
LOE ID: |
95562 |
|
Pollutant: |
Fecal Coliform |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
140 |
Number of Exceedances: |
9 |
|
Data and Information Type: |
PATHOGEN MONITORING |
Data Used to Assess Water Quality: |
Available data indicate sufficient exceedances of bacterial indicator objectives. There were 13 out of 139 samples that exceeded the single sample maximum for total coliform, 9 out of 140 that exceeded the single sample maximum for fecal coliform, 25 out of 140 that exceeded the single sample maximum for enterococci, and 20 out of 118 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: |
Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2001. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency |
|
Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
|
Temporal Representation: |
04/01/2003-10/25/2005 |
Environmental Conditions: |
Staff are not aware of any special environmental conditions associated with sampling. |
QAPP Information: |
Data record: summers 2003-2005, Marin County Health Dept. |
QAPP Information Reference(s): |
|