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DECISION ID |
16949 |
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| Pollutant: |
Phosphorus |
| Final Listing Decision: |
Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: |
New Decision |
| Revision Status |
Revised |
| 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 one line of evidence is necessary to assess listing status.
One line of evidence are available in the administrative record to assess this pollutant. Four of the samples exceed the water quality objective for phosphorus.
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 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. All four samples exceeded the phosphorus water quality objective and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met. A minimum of five samples is needed for application of table 3.2.
4. Pursuant to SECTION 3.11of 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 not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
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| SWRCB Board Decision / Staff Recommendation: |
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| USEPA Decision: |
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| LOE ID: |
8496 |
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| Pollutant: |
Phosphorus |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
Dissolved |
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| Beneficial Use: |
Warm Freshwater Habitat |
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| Number of Samples: |
4 |
| Number of Exceedances: |
4 |
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| Data and Information Type: |
Fixed station physical/chemical (conventional plus toxic pollutants) |
| Data Used to Assess Water Quality: |
Four water samples were collected at Paradise Creek station 908PPAR04 on May 2005, September 2005, January 2006 and April 2006. All four samples showed excessive phosphorus concentrations according to results in California's Surface Water Ambient Monitoring Program Report, 2007. |
| Data Reference: |
Monitoring data for Region 9 |
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| Water Quality Objective/Criterion: |
From the Basin Plan: For inland surface waters-streams and other flowing waters, with all beneficial uses, the water quality objective for total phosphorus is 0.1 mg/L (RWQCB, 2007). |
| Objective/Criterion Reference: |
Water Quality Control Plan for the San Diego Basin (9). |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
Water samples were collected at Paradise Creek station 908PPAR04; (Latitude 32.67115, Longitude -117.10303). |
| Temporal Representation: |
Samples were collected on May 2005, September 2005, January 2006, April 2006. |
| Environmental Conditions: |
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| QAPP Information: |
Quality control for the chemical analysis portion of this study was conducted in accordance with the California's Surface Water Ambient Monitoring Program. |
| QAPP Information Reference(s): |
2002. Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. California Department of Fish and Game, Monterey, CA. |
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DECISION ID |
16950 |
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| Pollutant: |
Selenium |
| Final Listing Decision: |
Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: |
New Decision |
| Revision Status |
Revised |
| 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 one line of evidence is necessary to assess listing status.
One line of evidence is available in the administrative record to assess this pollutant. Four of the samples exceed the water quality objective for Selenium.
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 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. All four samples exceeded the selenium water quality objective and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met. A minimum of five samples is needed for application of table 3.2.
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 not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
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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 16950 |
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| LOE ID: |
8495 |
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| Pollutant: |
Selenium |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
Dissolved |
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| Beneficial Use: |
Warm Freshwater Habitat |
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| Number of Samples: |
4 |
| Number of Exceedances: |
4 |
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| Data and Information Type: |
Fixed station physical/chemical (conventional plus toxic pollutants) |
| Data Used to Assess Water Quality: |
Four water samples were collected at Paradise Creek station 908PPAR04 on May 2005, September 2005, January 2006 and April 2006. All four samples showed excessive selenium concentrations according to results in California's Surface Water Ambient Monitoring Program Report, 2007. |
| Data Reference: |
Monitoring data for Region 9 |
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| Water Quality Objective/Criterion: |
CTR Freshwater Chronic (CCC) 5 ug/L; (U.S. EPA, 2000). |
| Objective/Criterion Reference: |
Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California; Rule. 40 CFR Part 131. U.S. Environmental Protection Agency, Region IX, Water Division, San Francisco, CA. |
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| Evaluation Guideline: |
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| Guideline Reference: |
Water Quality Control Plan for the San Diego Basin (9). |
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| Spatial Representation: |
Water samples were collected at Paradise Creek station 908PPAR04; (Latitude 32.67115, Longitude -117.10303). |
| Temporal Representation: |
Samples were collected on May 2005, September 2005, January 2006, April 2006. |
| Environmental Conditions: |
|
| QAPP Information: |
Quality control for the chemical analysis portion of this study was conducted in accordance with the California's Surface Water Ambient Monitoring Program. |
| QAPP Information Reference(s): |
2002. Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. California Department of Fish and Game, Monterey, CA. |