| Water Body Name: | Colorado River (Imperial Reservoir to California-Mexico Border) |
| Water Body ID: | CAR7270000020050815175128 |
| Water Body Type: | River & Stream |
DECISION ID |
6858 |
Region 7 |
Colorado River (Imperial Reservoir to California-Mexico Border) |
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| Pollutant: | Selenium |
| Final Listing Decision: | List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2006) |
| Revision Status | Original |
| Sources: | Source Unknown |
| Expected TMDL Completion Date: | 2019 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Conclusion: | 303(d) listing decisions made prior to 2006 were not held in an assessment database. This is a placeholder decision for a 303(d) listing made in a previous assessment cycle. The Regional Boards will update this decision when new data and information become available and are assessed. |
| RWQCB Board Staff Decision: | This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed. |
| SWRCB Board Staff Decision: | After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board. |
| USEPA Action (if applicable): | USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant. |
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| LOE ID: | 2968 | ||||
| Pollutant: | Selenium | ||||
| LOE Subgroup: | Pollutant-Tissue | ||||
| Matrix: | Tissue | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Commercial or recreational collection of fish, shellfish, or organisms | ||||
| Number of Samples: | 5 | ||||
| Number of Exceedances: | 3 | ||||
| Data and Information Type: | Not Specified | ||||
| Data Used to Assess Water Quality: | Three out of 5 samples exceeded (TSMP, 2002). A total of 5 filet samples of largemouth bass were collected. Bass were collected in 1992, 1999, and 2001-02. Bass exceeded the guideline in 1999 and 2001-02. | ||||
| Data Reference: | Placeholder reference 2006 303(d) | ||||
| Water Quality Objective/Criterion: | Colorado River Basin RWQCB Basin Plan: No individual chemical or combination of chemicals shall be present in concentrations that adversely affect beneficial uses. | ||||
| Objective/Criterion Reference: | Placeholder reference 2006 303(d) | ||||
| Evaluation Guideline: | OEHHA Screening Value 2 ug/g. | ||||
| Guideline Reference: | Placeholder reference 2006 303(d) | ||||
| Spatial Representation: | Two stations were sampled: about 2 miles downstream of the Needles Marina Resort and from Squaw Lake boat launch ramp to 1/4 mile north of Senator Lake. | ||||
| Temporal Representation: | Samples were collected annually in 1992, 1999 and 2001-02. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Toxic Substances Monitoring Program 1992-93 Data Report.
Environmental Chemistry Quality Assurance and Data Report for the Toxic Substances Monitoring Program, 1996-2000. Department of Fish and Game. Environmental Chemistry Quality Assurance and Data Report for the Toxic Substances Monitoring Program, 2001-2002. Department of Fish and Game. |
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| QAPP Information Reference(s): | |||||