| Water Body Name: | Mill Creek (Butte County) |
| Water Body ID: | CAR5184205120050722155911 |
| Water Body Type: | River & Stream |
DECISION ID |
73049 |
Region 5 |
Mill Creek (Butte County) |
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| Pollutant: | Temperature, water |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
| Revision Status | Original |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.
One line of evidence is available in the administrative record to assess this pollutant. None 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 against 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. None of the 3 annual maximum values exceeded the 21.0°C steelhead annual maximum temperature water quality objective and this does not exceed the allowable frequency listed in Table 3.2 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: | This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current cycle. 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. |
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| LOE ID: | 2630 | ||||
| Pollutant: | Temperature, water | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 3 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | Not Specified | ||||
| Data Used to Assess Water Quality: | Temperature measurements were taken over the span of 3 years (1999, 2000 and 2003) from June to September at a monitoring station along Mill Creek. Temperature monitoring was continuous using a digital thermograph. Based on the data provided, the monitoring station did not exceed the 21.0 degrees C annual maximum criterion for steelhead during the sampling period from 1999 to 2003. For each year monitored, there were 4 hourly maximum temperature values, one for each month (June to September). Based on each set of values the annual maximum temperature for each year was determined. There were a total of 3 annual maximum values. Of this total, none of the annual maximum temperature values exceeded the 21.0 degrees C criteria (PG&E, 2003a). | ||||
| Data Reference: | Placeholder reference 2006 303(d) | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | "The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses." | ||||
| Objective/Criterion Reference: | Placeholder reference 2006 303(d) | ||||
| Evaluation Guideline: | The guideline used was from Sullivan et al. (2000) Published Temperature Thresholds-Peer Reviewed Literature which includes reviewed sub-lethal and acute temperature thresholds from a wide range of studies, incorporating information from laboratory-based research, field observations, and risk assessment approaches. This report calculated the Annual Maximum (instantaneous maximum observed during the summer) upper threshold criterion for steelhead trout as 21.0 degrees C. The risk assessment approach used by Sullivan et al. (2000) suggests that an upper threshold for the Annual Maximum of 21.0 degrees C for steelhead will reduce average growth 10% from optimum. | ||||
| Guideline Reference: | Placeholder reference 2006 303(d) | ||||
| Spatial Representation: | There was 1 sampling station on Mill Creek in Butte County, which is part of the watershed for the North Fork of the Feather River. | ||||
| Temporal Representation: | Samples were taken during 1999, 2000 and 2003 from either June to September. For each station, temperature monitoring was continuous. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | High Quality - automatic data loggers, several years/water year types. Quality assurance well documented. | ||||
| QAPP Information Reference(s): | |||||