| Water Body Name: | Colorado River (Imperial Reservoir to California-Mexico Border) |
| Water Body ID: | CAR7270000020050815175128 |
| Water Body Type: | River & Stream |
DECISION ID |
34311 |
Region 7 |
Colorado River (Imperial Reservoir to California-Mexico Border) |
||
| Pollutant: | Selenium |
| Final Listing Decision: | Delist from 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | Delist from 303(d) list (TMDL required list)(2012) |
| Revision Status | Original |
| Reason for Delisting: | Applicable WQS attained; due to change in WQS |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for removal from the section 303(d) list under section 4.5 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. None of samples exceeded the water quality objective. In previous assessement cycle, prior to 2006, this database was assessed based on screening value of 2 mg/kg. Since the new OEHHA guideline, 2008, for selenium was used for current assessment cycle, the LOE 2968 was replaced by LOE 46528, which was assessed based on the new guideline. The LOE 46528 received use rating of insufficient information because the minimum sample size required by the Listing Policy to assess this water body for selenium is not met in this dataset. According to the Listing Policy, a minimum of 16 samples is needed for application of table 3.1. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for 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. None of five samples exceeded the OEHHA Fish Contaminant Goal for selenuium and this does not exceed 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. |
| Regional Board Decision Recommendation: | This region was not assessed this cycle. All decisions have been carried over from the previous cycle and remain the same. |
| State Board Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board. |
|
|||||
| LOE ID: | 46528 | ||||
| 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: | 0 | ||||
| Data and Information Type: | Not Specified | ||||
| Data Used to Assess Water Quality: | None of 5 samples exceeded (TSMP, 2002). A total of five filet samples of largemouth bass were collected. Bass were collected in 1992, 1999, and 2001-02. Bass exceeded the guidelines in 1999 and 2001-02. | ||||
| Data Reference: | Toxic Substances Monitoring Program data for years 1992-2002 and Coastal Fish Contamination Program for years 1 and 2. State Water Resources Control Board | ||||
| Toxic Substances Monitoring Program 1991 Data Report. 93-1WQ. State Water Resources Control Board (SWRCB), Division of Water Quality. Sacramento, CA. | |||||
| SWAMP Data: | |||||
| Water Quality Objective/Criterion: | Colorado River Basin RWQCB Basin Plan: No individual chemical or combinationof chemicals shall be present in concentrations that adversely affect beneficial uses. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan Colorado River Basin, with amendments adopted through June 2006 | ||||
| Evaluation Guideline: | OEHHA Fish Contaminant Goals(FCGs) 7.4 mg/kg | ||||
| Guideline Reference: | Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene | ||||
| 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 notrh of Senator Lake. | ||||
| Temporal Representation: | Samples were collected annuallly in 1992, 1999 and 2001-02. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Toxic Sustances Monitoring Program 1992-1993 Data Report.
Environmental Chemistry Qaulity 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. |
||||
| QAPP Information Reference(s): | |||||
|
|||||
| 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) | ||||
| SWAMP Data: | Non-SWAMP | ||||
| 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. |
||||
| QAPP Information Reference(s): | |||||