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DECISION ID |
12861 |
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Pollutant: |
Pyrethroids |
Final Listing Decision: |
List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: |
New Decision |
Revision Status |
Revised |
Sources: |
Urban Runoff/Storm Sewers |
Expected TMDL Completion Date: |
2021 |
Impairment from Pollutant or Pollution: |
Pollutant |
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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 lines of evidence are available in the administrative record to assess this pollutant. Five of the 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. Five of 6 samples exceed the narrative toxicity objective and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. Sediment-bound pyrethroid pesticide concentrations were used to calculate toxic units (TUs) of multiple pyrethroid pesticides observed in sediments. Pyrethroid TU analyses correlated with distribution and magnitude of toxicity.
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: |
22310 |
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Pollutant: |
Pyrethroids |
LOE Subgroup: |
Pollutant-Sediment |
Matrix: |
Sediment |
Fraction: |
Total |
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Beneficial Use: |
Warm Freshwater Habitat |
Aquatic Life Use: |
Warm Freshwater Habitat |
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Number of Samples: |
6 |
Number of Exceedances: |
5 |
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Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
Five of six sediment toxicity testing samples violated the narrative toxicity objective. The five toxic (Mean mortality + standard deviation) sediment samples were collected from:Kaseberg Creek at Caragh Road 9/25/04: 100+0Kaseberg Creek at Timberose Road 8/31/04: 16+99/24/04: 15+5Kaseberg Creek at 25 Meters North of McAnally Drive and Thunderbird Court 9/24/04: 38+18Kaseberg Creek at Country Club Boulevard and McAnally Drive 9/24/04: 93+12 Toxicity observations were associated with pyrethroid pesticides LC50s for sediment-bound pyrethroids were used in this study as toxicity threshold benchmarks in a Toxic Unit (TU) analysis normalized to organic carbon content. The TU analysis of Kaseberg Creek sediment samples demonstrated that the five toxic samples had pyrethroid pesticide concentrations that would be expected to be acutely toxic. The five toxic sediment samples had between 1 and 10 TUs or greater of pyrethroid pesticides. Bifenthrin appears to play a dominant role in the toxicity observations, but was not the only pyrethroid found in toxic sediment samples. Other pyrethroids observed in the toxic samples from Kaseberg Creek included cyfluthrin, cypermethrin, deltamethrin, esfenvalerate, lambda-cyhalothrin, and permethrin. LC50 concentrations for a 10-day exposure of Hyalella azteca to pyrethroid contaminated sediments were determined by Amweg et al., 2005. (Amweg, E.L., D.P. Weston, and N.M Ureda. 2005. Use and toxicity of pyrethroid pesticides in the Central Valley, California, U.S.A. Environ. Toxicol. Chem. 24:966-972 (with correction in Environ. Toxicol. Chem. 24:1300-1301)). |
Data Reference: |
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Water Quality Objective/Criterion: |
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (CVRWQCB, 2007)All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (CVRWQCB, 2007) |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
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Evaluation Guideline: |
Statistically significant difference from control sediment using Dunnett's test in 10-day Hyalella azteca sediment toxicity tests. Arcsin squareroot transformation was used when necessary to meet the assumptions of normality and homogeneity of variance. Steel's test was used for comparison to control if these assumptions were not met after transformation. |
Guideline Reference: |
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Spatial Representation: |
Samples were collected at Kaseberg Creek at Caragh Road, Kaseberg Creek at Timberose Road, Kaseberg Creek at 25 Meters North of McAnally Drive and Thunderbird CourtKaseberg Creek at Country Club Boulevard and McAnally DriveKaseberg Creek at Open Space Area/Aquatic Center |
Temporal Representation: |
Samples were collected September 2004 - October 2004. Data collected during late summer. |
Environmental Conditions: |
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QAPP Information: |
Data quality: Excellent.. Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program. |
QAPP Information Reference(s): |