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DECISION ID |
11457 |
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Pollutant: |
Boron |
Final Listing Decision: |
List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: |
New Decision |
Revision Status |
Revised |
Sources: |
Agriculture | Natural Sources |
Expected TMDL Completion Date: |
2021 |
Impairment from Pollutant or Pollution: |
Pollutant |
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Weight of Evidence: |
This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two line(s) of evidence is available in the administrative record to assess this pollutant. Six of the samples exceed the water quality objective.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.
This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Six of 6 samples exceeded the water quality objective and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
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RWQCB Board Decision / Staff Recommendation: |
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
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SWRCB Board Decision / Staff Recommendation: |
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USEPA Decision: |
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LOE ID: |
23285 |
|
Pollutant: |
Boron |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Dissolved |
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Beneficial Use: |
Agricultural Supply |
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Number of Samples: |
6 |
Number of Exceedances: |
6 |
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Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
The Quality Assurance Project Plan for Water Quality Monitoring for the Yolo Bypass Watershed Planning Project (QAPP; LWA, 2003) indicates that water samples were planned to be collected from Willow Slough Bypass approximately bimonthly between November 22 2003 and September 22 2004. According to the QAPP, three separate water samples were to be collected at Willow Slough Bypass on 1/23/2004 - one each primary, field duplicate (FD), and field blank (FB). However, the data provided indicates that only a primary and a -FB- sample were collected. The primary and -FB- sample results are identical, both for total and dissolved boron. The results for the samples collected on 1/23/2004 are similar in magnitude to the primary sample results for samples collected in Willow Slough Bypass on the other sample dates. It appears reasonable that the data reported for samples collected from Willow Slough Bypass on 1/23/2004 are for the primary and duplicate samples and 6 of 6 dissolved Boron concentrations exceeded the evaluation guideline for Boron. |
Data Reference: |
Yolo Bypass Water Quality Management Plan Report. Prepared under CALFED Watershed Grant, Agreement # 4600001691 for the City of Woodland |
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Water Quality Objective/Criterion: |
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (CVRWQCB, 2007). |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
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Evaluation Guideline: |
Boron levels should not exceed the Agricultural Water Quality Goal for Boron of 700 ug/L (Ayers and Westcott, 1985). |
Guideline Reference: |
Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) |
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Spatial Representation: |
Samples were collected at the lower end of Willow Slough Bypass. |
Temporal Representation: |
Samples were collected approximately bimonthly from November 22 2003 to September 22 2004. Willow Slough Bypass extends from Willow Slough near the Southern Pacific Railroad bridge, eastward to the Yolo Bypass. |
Environmental Conditions: |
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QAPP Information: |
Data quality: Good. Monitoring was conducted in accordance with the Quality Assurance Project Plan For Water Quality Monitoring For The Yolo Bypass Watershed Planning Project, 2003-2004 |
QAPP Information Reference(s): |
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LOE ID: |
23284 |
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Pollutant: |
Boron |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
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Beneficial Use: |
Agricultural Supply |
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Number of Samples: |
6 |
Number of Exceedances: |
6 |
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Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
The Quality Assurance Project Plan for Water Quality Monitoring for the Yolo Bypass Watershed Planning Project (QAPP; LWA, 2003) indicates that water samples were planned to be collected from Willow Slough Bypass approximately bimonthly between November 22 2003 and September 22 2004. According to the QAPP, three separate water samples were to be collected at Willow Slough Bypass on 1/23/2004 - one each primary, field duplicate (FD), and field blank (FB). However, the data provided indicates that only a primary and a -FB- sample were collected. The primary and -FB- sample results are identical, both for total and dissolved boron. The results for the samples collected on 1/23/2004 are similar in magnitude to the primary sample results for samples collected in Willow Slough Bypass on the other sample dates. It appears reasonable that the data reported for samples collected from Willow Slough Bypass on 1/23/2004 are for the primary and duplicate samples and 6 of 6 total Boron concentrations exceeded the evaluation guideline for Boron. |
Data Reference: |
Yolo Bypass Water Quality Management Plan Report. Prepared under CALFED Watershed Grant, Agreement # 4600001691 for the City of Woodland |
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Water Quality Objective/Criterion: |
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (CVRWQCB, 2007). |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
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Evaluation Guideline: |
Boron levels should not exceed the Agricultural Water Quality Goal for Boron of 700 ug/L (Ayers and Westcott, 1985). |
Guideline Reference: |
Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985) |
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Spatial Representation: |
Samples were collected at the lower end of Willow Slough Bypass. |
Temporal Representation: |
Samples were collected approximately bimonthly from November 22 2003 to September 22 2004. Willow Slough Bypass extends from Willow Slough near the Southern Pacific Railroad bridge, eastward to the Yolo Bypass. |
Environmental Conditions: |
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QAPP Information: |
Data quality: Questionable. Monitoring was conducted in accordance with the Quality Assurance Project Plan For Water Quality Monitoring For The Yolo Bypass Watershed Planning Project, 2003-2004 |
QAPP Information Reference(s): |
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DECISION ID |
11485 |
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Pollutant: |
Escherichia coli (E. Coli) |
Final Listing Decision: |
List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: |
New Decision |
Revision Status |
Revised |
Sources: |
Agriculture | Source Unknown |
Expected TMDL Completion Date: |
2021 |
Impairment from Pollutant or Pollution: |
Pollutant |
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Weight of Evidence: |
This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line(s) of evidence is available in the administrative record to assess this pollutant. Eleven of the samples exceed the water quality objective.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.
This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Eleven of 13 samples exceeded the E. Coli objective and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
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RWQCB Board Decision / Staff Recommendation: |
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
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SWRCB Board Decision / Staff Recommendation: |
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USEPA Decision: |
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Lines of Evidence (LOEs) for Decision ID 11485 |
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LOE ID: |
23279 |
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Pollutant: |
Escherichia coli (E. Coli) |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
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Beneficial Use: |
Water Contact Recreation |
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Number of Samples: |
13 |
Number of Exceedances: |
11 |
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Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
The Yolo Bypass Watershed Planning Program collected 13 samples from November 2003 to October 2004. Eleven of the 13 samples exceeded the evaluation objective. |
Data Reference: |
Yolo Bypass Water Quality Management Plan Report. Prepared under CALFED Watershed Grant, Agreement # 4600001691 for the City of Woodland |
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Water Quality Objective/Criterion: |
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. The objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
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Evaluation Guideline: |
In waters designated for contact recreation (REC-1), the E. coli concentration, based on a minimum of not less than five samples equally spaced over a 30-day period, shall not exceed a geometric mean of 126 MPN/100 mL and shall not exceed 235 MPN /100 mL in any single sample. |
Guideline Reference: |
Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002 |
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Spatial Representation: |
Samples were collected from Willow Slough. |
Temporal Representation: |
Sampling occurred from November 2003 to October 2004. |
Environmental Conditions: |
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QAPP Information: |
Data quality: Good. Monitoring was conducted in accordance with the Quality Assurance Project Plan For Water Quality Monitoring For The Yolo Bypass Watershed Planning Project, 2003-2004 |
QAPP Information Reference(s): |
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DECISION ID |
11486 |
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Pollutant: |
Fecal Coliform |
Final Listing Decision: |
List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: |
New Decision |
Revision Status |
Revised |
Sources: |
Source Unknown |
Expected TMDL Completion Date: |
2021 |
Impairment from Pollutant or Pollution: |
Pollutant |
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Weight of Evidence: |
This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line(s) of evidence is available in the administrative record to assess this pollutant. Ten of the samples exceed the water quality objective.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.
This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Ten of 12 calculated geometric means exceeded the fecal coliform objective and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
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RWQCB Board Decision / Staff Recommendation: |
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
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SWRCB Board Decision / Staff Recommendation: |
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USEPA Decision: |
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Lines of Evidence (LOEs) for Decision ID 11486 |
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LOE ID: |
23265 |
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Pollutant: |
Fecal Coliform |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
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Beneficial Use: |
Water Contact Recreation |
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Number of Samples: |
12 |
Number of Exceedances: |
10 |
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Data and Information Type: |
PATHOGEN MONITORING |
Data Used to Assess Water Quality: |
The Yolo Bypass Watershed Planning Program collected 10 samples from November 2003 to October 2004. The geometric mean per month per site was calculated from the samples and 10 out of the 12 calculated geometric means exceeded the evaluation objective. |
Data Reference: |
Yolo Bypass Water Quality Management Plan Report. Prepared under CALFED Watershed Grant, Agreement # 4600001691 for the City of Woodland |
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Water Quality Objective/Criterion: |
In waters designated for contact recreation (REC-1), the fecal coliform concentration based on a minimum of not less than five samples for any 30-day period shall not exceed a geometric mean of 200/100 ml, nor shall more than ten percent of the total number of samples taken during any 30-day period exceed 400/100 ml. |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
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Evaluation Guideline: |
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Guideline Reference: |
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Spatial Representation: |
Samples were collected from Willow Slough Bypass. |
Temporal Representation: |
Sampling occurred from November 2003 to October 2004 |
Environmental Conditions: |
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QAPP Information: |
Data quality: Good. Monitoring was conducted in accordance with the Quality Assurance Project Plan For Water Quality Monitoring For The Yolo Bypass Watershed Planning Project, 2003-2004 |
QAPP Information Reference(s): |