| Water Body Name: | Santa Clara River Reach 1 (Estuary to Hwy 101 Bridge) |
| Water Body ID: | CAR4031100019980917095027 |
| Water Body Type: | River & Stream |
DECISION ID |
5374 |
Region 4 |
Santa Clara River Reach 1 (Estuary to Hwy 101 Bridge) |
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| Pollutant: | Toxicity |
| 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 |
| Regional Board Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.6 of the Listing Policy. Under section 3.6 a water segment can be placed on the 303(d) list if the water segment exhibits significant toxicity and the observed toxicity is associated with a pollutant or pollutants. The water body segment may also be listed for toxicity alone.
One line of evidence is available in the administrative record to assess this pollutant. A sufficient number of samples exceed the evaluation guideline for toxicity and thus the basin plan narrative 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.Two of 2 samples exhibited significant USEPA 7-day Ceriodaphnia dubia test and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| Regional Board Decision Recommendation: | The decision has not changed. |
| 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. |
| 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: | 2005 | ||||
| Pollutant: | Toxicity | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Not Recorded | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 2 | ||||
| Number of Exceedances: | 2 | ||||
| Data and Information Type: | TOXICITY TESTING | ||||
| Data Used to Assess Water Quality: | Two of two toxicity samples with significant results compared to negative control based on statistical test, alpha of less than 5%, and less than the evaluation threshold (SWAMP, 2004). | ||||
| Data Reference: | Placeholder reference 2006 303(d) | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. Use of indicator organisms, analyses of species diversity, population density, growth anomalies, toxicity bioassays of appropriate duration shall determine compliance with this objective, or other appropriate methods as specified by the Regional Board. | ||||
| Objective/Criterion Reference: | Placeholder reference 2006 303(d) | ||||
| Evaluation Guideline: | Toxicity samples were tested using the 7-day Ceriodaphnia dubia test, EPA 1994. | ||||
| Guideline Reference: | Placeholder reference 2006 303(d) | ||||
| Spatial Representation: | One station: 34.23556 -119.24083. | ||||
| Temporal Representation: | Samples were taken in November 2001, February 2003 | ||||
| Environmental Conditions: | Santa Clara River Estuary-Between Highway 101 Bridge and Santa Clara River Estuary. | ||||
| QAPP Information: | SWAMP Quality Assurance Plan. | ||||
| QAPP Information Reference(s): | |||||