Data Used to Assess Water Quality: |
All four samples collected exceed the evaluation guideline of 1 mg/L according to results in the Riverside County Flood Control and Water Conservation District annual progress report from 2005 and 2006. Samples were collected on 10/20/04, 12/28/04, 10/18/05, and 2/27/06. |
Water Quality Objective/Criterion: |
Water bodies shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cause nuisance or adversely affect beneficial uses (RWQCB, 2007).
A desired goal in order to prevent plant nuisance in streams and other flowing waters appears to be 0.1 mg/L total phosphorus, P. These values are not to be exceeded more than 10% of the time unless studies of the specific water body in question clearly show that water quality objective changes are permissible and changes are approved by the Regional Board. Analogous threshold values have not been set for nitrogen compounds; however, natural ratios of nitrogen to phosphorus are to be determined by surveillance and monitoring and upheld. If data are lacking, a ratio of N:P = 10:1, on a weight to weight basis shall be used (RWQCB, 2007). |
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DECISION ID |
16520 |
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Pollutant: |
Chlorpyrifos |
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: |
2019 |
Impairment from Pollutant or Pollution: |
Pollutant |
|
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.
One line of evidence is available in the administrative record to assess this pollutant. Three of the 4 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. Three of the 4 samples exceed the Basin Plan objective for pesticides 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: |
6456 |
|
Pollutant: |
Chlorpyrifos |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
|
Beneficial Use: |
Warm Freshwater Habitat |
|
Number of Samples: |
4 |
Number of Exceedances: |
3 |
|
Data and Information Type: |
Fixed station physical/chemical monitoring (conventional pollutants only) |
Data Used to Assess Water Quality: |
Three out of four samples exceeded 1-hour average concentration of Chlorpyrifos according to results in the Riverside County Flood Control and Water Conservation District's Watershed Annual Progress Report from 2005 and 2006. Samples were collected on 10/20/04, 12/28/04, 10/18/05, and 2/27/06. |
Data Reference: |
Watershed Annual Progress Report 2004 and 2005.
Watershed Annual Progress Report 2005 and 2006.
|
|
Water Quality Objective/Criterion: |
No individual pesticide or combination of pesticides shall be present in the water column, sediments or biota at concentration(s) that adversely affect beneficial uses. Pesticides shall not be present at levels which will bioaccumulate in aquatic organisms to levels which are harmful to human health, wildlife or aquatic organisms (RWQCB, 2007). |
Objective/Criterion Reference: |
Water Quality Control Plan for the San Diego Basin (9). |
|
Evaluation Guideline: |
The 4-day average concentration of chlorpyrifos in freshwater is 0.014 ug/L. The 1-hour average concentration of chlorpyrifos in freshwater is 0.025 ug/L according to Siepmann and Finlayson, 2000; Finlayson, 2004. |
Guideline Reference: |
Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game |
|
Spatial Representation: |
Samples were collected at station 780 on Long Canyon Creek. Lat/long: 33°3038 N/117°0940 W. |
Temporal Representation: |
Samples were collected on the following dates: 10/20/04, 12/28/04, 10/18/05, and 2/27/06. |
Environmental Conditions: |
One sample represents the first storm event of each monitoring year that produces sufficient flow to collect a composite sample. In addition, another sample is collected during the monitoring year to represent a wet weather event. |
QAPP Information: |
Quality assurance conducted according to the Riverside County's Consolidated Monitoring Plan. |
QAPP Information Reference(s): |
Watershed Annual Progress Report 2004 and 2005.
Watershed Annual Progress Report 2005 and 2006.
|
|
DECISION ID |
16559 |
|
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: |
Source Unknown |
Expected TMDL Completion Date: |
2019 |
Impairment from Pollutant or Pollution: |
Pollutant |
|
Weight of Evidence: |
This pollutant is being considered for placement on the section 303(d) list under section 3.3 of the Listing Policy. Under section 3.3 a single 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 4 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. Four of the 4 samples exceed the Basin Plan objective for E. Coli 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 16559 |
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LOE ID: |
7150 |
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Pollutant: |
Escherichia coli (E. Coli) |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
|
Beneficial Use: |
Water Contact Recreation |
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Number of Samples: |
4 |
Number of Exceedances: |
4 |
|
Data and Information Type: |
Fixed station physical/chemical monitoring (conventional pollutants only) |
Data Used to Assess Water Quality: |
All four samples collected exceed the water quality objective according to the results in the Riverside County Flood Control and Water Conservation District annual progress report from 2005 and 2006. Samples were collected on 10/20/04, 12/28/04, 10/18/05 and 2/27/06. |
Data Reference: |
Watershed Annual Progress Report 2004 and 2005.
Watershed Annual Progress Report 2005 and 2006.
|
|
Water Quality Objective/Criterion: |
The maximum E. coli level for moderately or lightly used areas is 406 colonies per 100 ml (RWQCB, 2007). |
Objective/Criterion Reference: |
Water Quality Control Plan for the San Diego Basin (9). |
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Evaluation Guideline: |
|
Guideline Reference: |
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Spatial Representation: |
Samples were collected at Long Canyon Creek.
Lat/long: 33°3038 N/117°0940 W. |
Temporal Representation: |
Samples were collected on 10/20/04, 12/28/04, 10/18/05 and 2/27/06. |
Environmental Conditions: |
One sample represents the first storm event of each monitoring year that produces sufficient flow to collect a composite sample. In addition, another sample is collected during the monitoring year to represent a wet weather event. |
QAPP Information: |
Quality assurance conducted according to the Riverside County's Consolidated Monitoring Plan. |
QAPP Information Reference(s): |
Watershed Annual Progress Report 2004 and 2005.
Watershed Annual Progress Report 2005 and 2006.
|
|
DECISION ID |
16560 |
|
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: |
2019 |
Impairment from Pollutant or Pollution: |
Pollutant |
|
Weight of Evidence: |
This pollutant is being considered for placement on the section 303(d) list under section 3.3 of the Listing Policy. Under section 3.3 a single 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 4 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. Four of the 4 samples exceed the Basin Plan objective for Fecal Coliform 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 16560 |
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LOE ID: |
7398 |
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Pollutant: |
Fecal Coliform |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
4 |
Number of Exceedances: |
4 |
|
Data and Information Type: |
Fixed station physical/chemical monitoring (conventional pollutants only) |
Data Used to Assess Water Quality: |
All four samples collected exceed the water quality objective according to results in the Riverside County Flood Control and Water Conservation District annual progress report from 2005 and 2006. Samples were collected on 10/20/04, 12/28/04, 10/18/05 and 2/27/06. |
Data Reference: |
Watershed Annual Progress Report 2004 and 2005.
Watershed Annual Progress Report 2005 and 2006.
|
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Water Quality Objective/Criterion: |
From the Basin Plan, no more than 10% of the samples during any 30-day period for waters designated for contact recreation shall exceed 400 per 100 ml (RWQCB, 2007). |
Objective/Criterion Reference: |
Water Quality Control Plan for the San Diego Basin (9). |
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Evaluation Guideline: |
|
Guideline Reference: |
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Spatial Representation: |
Samples were collected at Long Canyon Creek.
Lat/long: 33°3038 N/117°0940 W. |
Temporal Representation: |
Samples were collected on 10/20/04, 12/28/04, 10/18/05 and 2/27/06. |
Environmental Conditions: |
One sample represents the first storm event of each monitoring year that produces sufficient flow to collect a composite sample. In addition, another sample is collected during the monitoring year to represent a wet weather event. |
QAPP Information: |
Quality assurance conducted according to the Riverside County's Consolidated Monitoring Plan. |
QAPP Information Reference(s): |
Watershed Annual Progress Report 2004 and 2005.
Watershed Annual Progress Report 2005 and 2006.
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|
DECISION ID |
16518 |
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Pollutant: |
Iron |
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: |
2019 |
Impairment from Pollutant or Pollution: |
Pollutant |
|
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.
One line of evidence is available in the administrative record to assess this pollutant. Four of the 4 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. Four of the 4 samples exceed the secondary drinking water MCL for iron 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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Lines of Evidence (LOEs) for Decision ID 16518 |
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LOE ID: |
6264 |
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Pollutant: |
Iron |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
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Beneficial Use: |
Municipal & Domestic Supply |
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Number of Samples: |
4 |
Number of Exceedances: |
4 |
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Data and Information Type: |
Fixed station physical/chemical monitoring (conventional pollutants only) |
Data Used to Assess Water Quality: |
All four samples collected exceed the water quality objective according to results in the Riverside County Flood Control and Water Conservation District annual progress report from 2005 and 2006. Samples were collected on 10/20/04, 12/28/04, 10/18/05, and 2/27/06. |
Data Reference: |
Watershed Annual Progress Report 2004 and 2005.
Watershed Annual Progress Report 2005 and 2006.
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Water Quality Objective/Criterion: |
From the Basin Plan, inland surface waters designated as domestic or municipal supply, shall not contain concentrations of iron in excess of the secondary maximum contaminant level 0.3 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: |
Samples were collected at Long Canyon Creek.
Lat/long: 33°3038 N/117°0940 W. |
Temporal Representation: |
Samples were collected on the following dates: 10/20/04, 12/28/04, 10/18/05, and 2/27/06. |
Environmental Conditions: |
|
QAPP Information: |
Quality assurance conducted according to the Riverside County's Consolidated Monitoring Plan. |
QAPP Information Reference(s): |
Watershed Annual Progress Report 2004 and 2005.
Watershed Annual Progress Report 2005 and 2006.
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|
DECISION ID |
16519 |
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Pollutant: |
Manganese |
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: |
2019 |
Impairment from Pollutant or Pollution: |
Pollutant |
|
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.
One line of evidence is available in the administrative record to assess this pollutant. Four of the 4 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. Four of the 4 samples exceed the secondary drinking water MCL for Mn 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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Lines of Evidence (LOEs) for Decision ID 16519 |
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LOE ID: |
6458 |
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Pollutant: |
Manganese |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
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Beneficial Use: |
Municipal & Domestic Supply |
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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: |
All four samples collected exceed the water quality objective according to results in the Riverside County Flood Control and Water Conservation District annual progress report from 2005 and 2006. Samples were collected on 10/20/04, 12/28/04, 10/18/05, and 2/27/06. |
Data Reference: |
Watershed Annual Progress Report 2004 and 2005.
Watershed Annual Progress Report 2005 and 2006.
|
|
Water Quality Objective/Criterion: |
From the Basin Plan, inland surface waters designated as domestic or municipal supply shall not contain concentrations of manganese in excess of the secondary maximum contaminant level 0.05 mg/L (RWQCB, 2007) |
Objective/Criterion Reference: |
Water Quality Control Plan for the San Diego Basin (9). |
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Evaluation Guideline: |
|
Guideline Reference: |
|
Spatial Representation: |
Samples were collected at station 780 on Long Canyon Creek. Lat/long: 33°3038 N/117°0940 W. |
Temporal Representation: |
Samples were collected on the following dates: 10/20/04, 12/28/04, 10/18/05, and 2/27/06. |
Environmental Conditions: |
One sample represents the first storm event of each monitoring year that produces sufficient flow to collect a composite sample. In addition, another sample is collected during the monitoring year to represent a wet weather event. |
QAPP Information: |
Quality assurance conducted according to the Riverside County's Consolidated Monitoring Plan. |
QAPP Information Reference(s): |
Watershed Annual Progress Report 2004 and 2005.
Watershed Annual Progress Report 2005 and 2006.
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