| |
DECISION ID |
7397 |
| |
| Pollutant: |
1,1-Dichloroethylene (DCE)/ Vinyldine Chloride |
| Final Listing Decision: |
Delist from 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: |
List on 303(d) list (TMDL required list)(2006) |
| Revision Status |
Revised |
| Reason for Delisting: |
State determines water quality standard is being met |
| Impairment from Pollutant or Pollution: |
Pollutant |
| |
| Weight of Evidence: |
This pollutant is being considered for removal from the section 303(d) list under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of 40 samples exceeded the Human Health (aquatic organism consumption only) CTR value for 1,1-Dichloroethene (1,1-DCE).
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification to support removing this water segment-pollutant combination from the section 303(d) list.
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. Zero of 40 water samples exceeded the CTR value for 1,1-DCE and this meets the allowable frequency listed in Table 4.1 of the Listing Policy.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| |
| RWQCB Board Decision / Staff Recommendation: |
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards for the pollutant are being attained. |
| |
| SWRCB Board Decision / Staff Recommendation: |
|
| |
| USEPA Decision: |
|
| |
| |
| |
| LOE ID: |
3916 |
| |
| Pollutant: |
1,1-Dichloroethylene (DCE)/ Vinyldine Chloride |
| 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): |
|
| |
| LOE ID: |
30159 |
| |
| Pollutant: |
1,1-Dichloroethylene (DCE)/ Vinyldine Chloride |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
Total |
| |
| Beneficial Use: |
Municipal & Domestic Supply |
| |
| Number of Samples: |
40 |
| Number of Exceedances: |
0 |
| |
| Data and Information Type: |
Not Specified |
| Data Used to Assess Water Quality: |
None of 40 samples exceeded the CTR Other Waters (aquatic organism consumption only) guideline. Data collected as part of the City of Los Angeles, Department of Public Works, Bureau of Sanitation Status and Trends Monitoring program were available for assessment. |
| Data Reference: |
City of Los Angeles, Department of Public Works, Bureau of Sanitation
Status and Trends Monitoring Program VOC Data |
| |
| Water Quality Objective/Criterion: |
The Region 4 Basin Plan Objective for chemical constituents states: "Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use." |
| Objective/Criterion Reference: |
Water Quality Control Plan Los Angeles Region R4 Basin Plan |
| |
Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009 |
| |
| Evaluation Guideline: |
The CTR criteria for the protection of human health (30 day average) associated with the consumption of water and aquatic organisms is 0.057 ug/L and associated with aquatic organism consumption only is 3.2 ug/L. |
| Guideline Reference: |
Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency |
| |
| Spatial Representation: |
One monitoring station is located on the Los Angeles River Reach 6. It is a City of Los Angeles, Department of Public Works, Bureau of Sanitation station located at White Oak Ave. |
| Temporal Representation: |
Samples were taken one to three times per month from 3/7/06 to 8/21/07. |
| Environmental Conditions: |
|
| QAPP Information: |
Data collected by the City of Los Angeles, Department of Public Works, Bureau of Sanitation as part of their Status and Trends Monitoring Program. |
| QAPP Information Reference(s): |
City of Los Angeles, Department of Public Works, Bureau of Sanitation Status and Trends Monitoring Program QAPP for VOC Collection and Laboratory Analysis
|
| |
DECISION ID |
7400 |
| |
| Pollutant: |
Tetrachloroethylene/PCE |
| Final Listing Decision: |
Delist from 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: |
List on 303(d) list (TMDL required list)(2006) |
| Revision Status |
Revised |
| Reason for Delisting: |
State determines water quality standard is being met |
| Impairment from Pollutant or Pollution: |
Pollutant |
| |
| Weight of Evidence: |
This pollutant is being considered for removal from the section 303(d) list under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of 40 samples exceeded the Human Health (aquatic organism consumption only) CTR value for tetrachloroethylene (PCE).
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification to support removing this water segment-pollutant combination from the section 303(d) list.
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. Zero of 40 water samples exceeded the CTR value for PCE and this meets the allowable frequency listed in Table 4.1 of the Listing Policy.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| |
| RWQCB Board Decision / Staff Recommendation: |
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards for the pollutant are being attained. |
| |
| SWRCB Board Decision / Staff Recommendation: |
|
| |
| USEPA Decision: |
|
| |
| |
Lines of Evidence (LOEs) for Decision ID 7400 |
| |
| LOE ID: |
3918 |
| |
| Pollutant: |
Tetrachloroethylene/PCE |
| 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): |
|
| |
| LOE ID: |
30161 |
| |
| Pollutant: |
Tetrachloroethylene/PCE |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
Total |
| |
| Beneficial Use: |
Municipal & Domestic Supply |
| |
| Number of Samples: |
40 |
| Number of Exceedances: |
0 |
| |
| Data and Information Type: |
Not Specified |
| Data Used to Assess Water Quality: |
None of 40 samples exceeded the CTR Other Waters (aquatic organism consumption only) guideline. Data collected as part of the City of Los Angeles, Department of Public Works, Bureau of Sanitation Status and Trends Monitoring program were available for assessment. |
| Data Reference: |
City of Los Angeles, Department of Public Works, Bureau of Sanitation
Status and Trends Monitoring Program VOC Data |
| |
| Water Quality Objective/Criterion: |
The Region 4 Basin Plan Objective for chemical constituents states: "Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use." |
| Objective/Criterion Reference: |
Water Quality Control Plan Los Angeles Region R4 Basin Plan |
| |
Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009 |
| |
| Evaluation Guideline: |
The CTR criteria for the protection of human health (30 day average) associated with the consumption of water and aquatic organisms is 0.8 ug/L and associated with aquatic organism consumption only is 8.85 ug/L. |
| Guideline Reference: |
Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency |
| |
| Spatial Representation: |
One monitoring station is located on the Los Angeles River Reach 6. It is a City of Los Angeles, Department of Public Works, Bureau of Sanitation station located at White Oak Ave. |
| Temporal Representation: |
Samples were taken one to three times per month from 3/7/06 to 8/21/07. |
| Environmental Conditions: |
|
| QAPP Information: |
Data collected by the City of Los Angeles, Department of Public Works, Bureau of Sanitation as part of their Status and Trends Monitoring Program. |
| QAPP Information Reference(s): |
City of Los Angeles, Department of Public Works, Bureau of Sanitation Status and Trends Monitoring Program QAPP for VOC Collection and Laboratory Analysis
|
| |
DECISION ID |
7401 |
| |
| Pollutant: |
Trichloroethylene/TCE |
| Final Listing Decision: |
Delist from 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: |
List on 303(d) list (TMDL required list)(2006) |
| Revision Status |
Revised |
| Reason for Delisting: |
State determines water quality standard is being met |
| Impairment from Pollutant or Pollution: |
Pollutant |
| |
| Weight of Evidence: |
This pollutant is being considered for removal from the section 303(d) list under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of 40 samples exceeded the Human Health (aquatic organism consumption only) CTR value for trichloroethylene (TCE).
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification to support removing this water segment-pollutant combination from the section 303(d) list.
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. Zero of 40 water samples exceeded the CTR value for TCE and this meets the allowable frequency listed in Table 4.1 of the Listing Policy.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| |
| RWQCB Board Decision / Staff Recommendation: |
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards for the pollutant are being attained. |
| |
| SWRCB Board Decision / Staff Recommendation: |
|
| |
| USEPA Decision: |
|
| |
| |
Lines of Evidence (LOEs) for Decision ID 7401 |
| |
| LOE ID: |
30160 |
| |
| Pollutant: |
Trichloroethylene/TCE |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
Total |
| |
| Beneficial Use: |
Municipal & Domestic Supply |
| |
| Number of Samples: |
40 |
| Number of Exceedances: |
0 |
| |
| Data and Information Type: |
Not Specified |
| Data Used to Assess Water Quality: |
None of 40 samples exceeded the CTR Other Waters (aquatic organism consumption only) guideline. Data collected as part of the City of Los Angeles, Department of Public Works, Bureau of Sanitation Status and Trends Monitoring program were available for assessment. |
| Data Reference: |
City of Los Angeles, Department of Public Works, Bureau of Sanitation
Status and Trends Monitoring Program VOC Data |
| |
| Water Quality Objective/Criterion: |
The Region 4 Basin Plan Objective for chemical constituents states: "Surface waters shall not contain concentrations of chemical constituents in amounts that adversely affect any designated beneficial use." |
| Objective/Criterion Reference: |
Water Quality Control Plan Los Angeles Region R4 Basin Plan |
| |
Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009 |
| |
| Evaluation Guideline: |
The CTR criteria for the protection of human health (30 day average) associated with the consumption of water and organisms is 2.7 ug/L and associated with aquatic organism consumption only is 81 ug/L. |
| Guideline Reference: |
Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency |
| |
| Spatial Representation: |
One monitoring station is located on the Los Angeles River Reach 6. It is a City of Los Angeles, Department of Public Works, Bureau of Sanitation station located at White Oak Ave. |
| Temporal Representation: |
Samples were taken one to three times per month from 3/7/06 to 8/21/07. |
| Environmental Conditions: |
|
| QAPP Information: |
Data collected by the City of Los Angeles, Department of Public Works, Bureau of Sanitation as part of their Status and Trends Monitoring Program. |
| QAPP Information Reference(s): |
City of Los Angeles, Department of Public Works, Bureau of Sanitation Status and Trends Monitoring Program QAPP for VOC Collection and Laboratory Analysis
|
|
| |
| LOE ID: |
3919 |
| |
| Pollutant: |
Trichloroethylene/TCE |
| 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): |