| Data Used to Assess Water Quality: |
A TMDL has been approved for this water segment-pollutant combination. The Total Maximum Daily Load for Boron, Chloride, Sulfate, and TDS (Salts) in the Calleguas Creek Watershed was adopted by the Los Angeles RWQCB on Oct 04, 2007 and subsequently approved by USEPA on Dec 2, 2008. The TMDL was integrated into the Basin Plan as Attachment A of Regional Board Resolution No. 2007-016. |
| |
DECISION ID |
7540 |
| |
| Pollutant: |
Sulfates |
| Final Listing Decision: |
List on 303(d) list (being addressed by USEPA approved TMDL) |
| Last Listing Cycle's Final Listing Decision: |
List on 303(d) list (TMDL required list)(2006) |
| Revision Status |
Revised |
| Sources: |
Other |
| TMDL Name: |
Calleguas Creek Boron/Sulfate/TDS (4) |
| TMDL Project Code: |
357 |
| Date TMDL Approved by USEPA: |
12/02/2008 |
| Impairment from Pollutant or Pollution: |
Pollutant |
| |
| Weight of Evidence: |
This pollutant is being considered for removal on the section 303(d) list under sections 2.2 of the Listing Policy. Under 2.2 of the Policy, a minimum of one line of evidence is needed to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list. There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been completed and adopted by the Los Angeles RWQCB and approved by USEPA, and is expected to result in attainment of the standard. |
| |
| 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 Water Quality Limited Segments Being Addressed category of the section 303(d) list because a TMDL has been approved by USEPA, and applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
| |
| SWRCB Board Decision / Staff Recommendation: |
|
| |
| USEPA Decision: |
|
| |
| |
| |
| LOE ID: |
30149 |
| |
| Pollutant: |
Sulfates |
| LOE Subgroup: |
Narrative Description Data |
| Matrix: |
Not Specified |
| Fraction: |
None |
| |
| Beneficial Use: |
Municipal & Domestic Supply |
| |
| Number of Samples: |
0 |
| Number of Exceedances: |
0 |
| |
| Data and Information Type: |
Not Specified |
| Data Used to Assess Water Quality: |
A TMDL has been approved for this water segment-pollutant combination. The Total Maximum Daily Load for Boron, Chloride, Sulfate, and TDS (Salts) in the Calleguas Creek Watershed was adopted by the Los Angeles RWQCB on Oct 04, 2007 and subsequently approved by USEPA on Dec 2, 2008. The TMDL was integrated into the Basin Plan as Attachment A of Regional Board Resolution No. 2007-016. |
| Data Reference: |
Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009 |
| |
| Water Quality Objective/Criterion: |
|
| Objective/Criterion Reference: |
| |
| Evaluation Guideline: |
|
| Guideline Reference: |
| |
| Spatial Representation: |
|
| Temporal Representation: |
|
| Environmental Conditions: |
|
| QAPP Information: |
QA information unavailable. |
| QAPP Information Reference(s): |
|
| |
| LOE ID: |
4130 |
| |
| Pollutant: |
Sulfates |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
Not Recorded |
| |
| Beneficial Use: |
Municipal & Domestic Supply |
| |
| Number of Samples: |
0 |
| Number of Exceedances: |
0 |
| |
| Data and Information Type: |
Not Specified |
| Data Used to Assess Water Quality: |
Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006. |
| Data Reference: |
Placeholder reference pre-2006 303(d) |
| |
| Water Quality Objective/Criterion: |
Unspecified |
| Objective/Criterion Reference: |
Placeholder reference pre-2006 303(d) |
| |
| Evaluation Guideline: |
Unspecified |
| Guideline Reference: |
Placeholder reference pre-2006 303(d) |
| |
| Spatial Representation: |
Unspecified |
| Temporal Representation: |
Unspecified |
| Environmental Conditions: |
Unspecified |
| QAPP Information: |
Unspecified |
| QAPP Information Reference(s): |
| |
DECISION ID |
7542 |
| |
| Pollutant: |
Total Dissolved Solids |
| Final Listing Decision: |
List on 303(d) list (being addressed by USEPA approved TMDL) |
| Last Listing Cycle's Final Listing Decision: |
List on 303(d) list (TMDL required list)(2006) |
| Revision Status |
Revised |
| Sources: |
Other |
| TMDL Name: |
Calleguas Creek Boron/Sulfate/TDS (4) |
| TMDL Project Code: |
357 |
| Date TMDL Approved by USEPA: |
12/02/2008 |
| Impairment from Pollutant or Pollution: |
Pollutant |
| |
| Weight of Evidence: |
This pollutant is being considered for removal on the section 303(d) list under sections 2.2 of the Listing Policy. Under 2.2 of the Policy, a minimum of one line of evidence is needed to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list. There is sufficient justification to place it in the Being Addressed portion of the 303(d) list because a TMDL has been completed and adopted by the Los Angeles RWQCB and approved by USEPA, and is expected to result in attainment of the standard. |
| |
| 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 Water Quality Limited Segments Being Addressed category of the section 303(d) list because a TMDL has been approved by USEPA, and applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
| |
| SWRCB Board Decision / Staff Recommendation: |
|
| |
| USEPA Decision: |
|
| |
| |
Lines of Evidence (LOEs) for Decision ID 7542 |
| |
| LOE ID: |
4131 |
| |
| Pollutant: |
Total Dissolved Solids |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
Not Recorded |
| |
| Beneficial Use: |
Agricultural Supply |
| |
| Number of Samples: |
0 |
| Number of Exceedances: |
0 |
| |
| Data and Information Type: |
Not Specified |
| Data Used to Assess Water Quality: |
Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006. |
| Data Reference: |
Placeholder reference pre-2006 303(d) |
| |
| Water Quality Objective/Criterion: |
Unspecified |
| Objective/Criterion Reference: |
Placeholder reference pre-2006 303(d) |
| |
| Evaluation Guideline: |
Unspecified |
| Guideline Reference: |
Placeholder reference pre-2006 303(d) |
| |
| Spatial Representation: |
Unspecified |
| Temporal Representation: |
Unspecified |
| Environmental Conditions: |
Unspecified |
| QAPP Information: |
Unspecified |
| QAPP Information Reference(s): |
|
| |
| LOE ID: |
30148 |
| |
| Pollutant: |
Total Dissolved Solids |
| LOE Subgroup: |
Narrative Description Data |
| Matrix: |
Not Specified |
| Fraction: |
None |
| |
| Beneficial Use: |
Agricultural Supply |
| |
| Number of Samples: |
0 |
| Number of Exceedances: |
0 |
| |
| Data and Information Type: |
Not Specified |
| Data Used to Assess Water Quality: |
A TMDL has been approved for this water segment-pollutant combination. The Total Maximum Daily Load for Boron, Chloride, Sulfate, and TDS (Salts) in the Calleguas Creek Watershed was adopted by the Los Angeles RWQCB on Oct 04, 2007 and subsequently approved by USEPA on Dec 2, 2008. The TMDL was integrated into the Basin Plan as Attachment A of Regional Board Resolution No. 2007-016. |
| Data Reference: |
Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009 |
| |
| Water Quality Objective/Criterion: |
|
| Objective/Criterion Reference: |
| |
| Evaluation Guideline: |
|
| Guideline Reference: |
| |
| Spatial Representation: |
|
| Temporal Representation: |
|
| Environmental Conditions: |
|
| QAPP Information: |
QA information unavailable. |
| QAPP Information Reference(s): |