| Water Body Name: | Rodeo Creek (Marin County) |
| Water Body ID: | CAR2013001420080714111405 |
| Water Body Type: | River & Stream |
Lines of Evidence (LOEs) for Decision ID 7749 |
| LOE ID: | 5857 |
| Pollutant: | Benthic-Macroinvertebrate Bioassessments |
| LOE Subgroup: | Population/Community Degradation |
| Matrix: | Water |
| Fraction: | None |
| Beneficial Use: | Cold Freshwater Habitat |
| Number of Samples: | 2 |
| Number of Exceedances: | 0 |
| Data and Information Type: | Benthic macroinvertebrate surveys |
| Data Used to Assess Water Quality: | Benthic macroinvertebrates were sampled from two sites in the Rodeo Creek watershed in May 2005 by the SWAMP program. Benthic macroinvertebrate assemblage metrics were similar to values observed at reference sites in perennial creeks and indicated good conditions. Taxa richness score ranged from 22 to 28 and % sensitive EPT were 37 to 38. |
| Data Reference: | Data collected by the Surface Water Ambient Monitoring Program, San Francisco Bay Regional Water Quality Control Board. Years 4 and 5 Assessment |
| Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce significant alterations in population or community ecology or receiving water biota. In addition, the health and life history characteristics of aquatic organisms in waters affected by controllable water quality factors shall not differ significantly from those for the same waters in areas unaffected by controllable water quality factors. |
| Objective/Criterion Reference: | San Francisco Bay Basin (Region 2) Water Quality Control Plan (Basin Plan) |
| Evaluation Guideline: | Benthic macroinvertebrate assemblage metric scores that are within the range of scores for minimally disturbed reference sites indicate no substantial alterations in community ecology. Taxa richness values at reference sites sampled by the SWAMP program between 2001 and 2003 ranged from 28 to 59. Reference conditions determined for perennial streams such as Rodeo Creek, usually exhibit taxa richness > 38 and % sensitive EPT > 44. A perennial stream could be described as in - excellent condition - if there is no difference between the metrics measured at the site and those established for reference sites. A perennial stream will be described as in - good condition - if the site metrics indicate minor loss of bio-integrity but still a good structure and function, and sensitive species are present in abundance. |
| Guideline Reference: | Water Quality Monitoring and Bioassessment in Nine San Francisco Bay Region Watersheds: Walker Creek, Lagunitas Creek, San Leandro Creek, Wildcat Creek/San Pablo Creek, Suisun Creek, Arroyo Las Positas, Pescadero Creek/Butano Creek, San Gregorio Creek, and Stevens Creek/Permanente Creek. Oakland, CA: Surface Water Ambient Monitoring Program, San Francisco Bay Regional Water Quality Control Board |
| Spatial Representation: | Benthic macroinvertebrates were sampled from two sites. One site was located on the mainstem of Rodeo Creek upstream from the confluence with Gerbode Creek, a tributary that was also sampled. |
| Temporal Representation: | Benthic macroinvertebrates were sampled in May 2005. |
| Environmental Conditions: | |
| QAPP Information: | All samples were collected and analyzed using procedures comparable with the SWAMP Quality Assurance Management Plan (SWRCB 2002). |
| QAPP Information Reference(s): | |
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| LOE ID: | 5759 |
| 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: | PHYSICAL/CHEMICAL MONITORING |
| Data Used to Assess Water Quality: | A water quality assessment was conducted at Rodeo Creek as part of SWAMP study in 2005. Continuous field monitoring at 15 minute increments of temperature, dissolved oxygen, pH and specific conductance was conducted to determine temporal variability in basic water quality at one location.
The estimated 7-day mean temperature was 13.43 in spring, 13.27°C during dry summer season, and 10.47 °C during wet season. The 14.8 °C criterion for coho salmon and the 17 °C criterion for steelhead were never exceeded. |
| Data Reference: | Data collected by the Surface Water Ambient Monitoring Program, San Francisco Bay Regional Water Quality Control Board. Years 4 and 5 Assessment |
| Water Quality Objective/Criterion: | Temperature objectives for enclosed bays and estuaries are specified in the "Water Quality Control Plan for Control of Temperature in the Coastal and Interstate Waters and Enclosed Bays of California" including any revisions to the plan. In addition, the following temperature objectives apply to surface waters: 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.
The temperature of any cold or warm freshwater habitat shall not be increased by more than 5°F (2.8°C) above natural receiving water temperature. |
| Objective/Criterion Reference: | San Francisco Bay Basin (Region 2) Water Quality Control Plan (Basin Plan) |
| Evaluation Guideline: | Sullivan et al. (2000) reviewed a wide range of studies incorporating information from laboratory-based research, field observations, and risk assessment approaches and developed criteria for assessing temperature risk to aquatic life. The 7-day mean temperature (maximum value of the 7-day moving average of the daily mean temperature) of 14.8°C was established as the upper threshold criterion for coho salmon and 17.0°C for steelhead trout. The risk assessment approach used by Sullivan et al. (2000) suggests that temperatures exceeding the above thresholds will cause 10% reduction in average growth compared to optimal conditions. |
| Guideline Reference: | An Analysis of the Effects of Temperature on Salmonids of the Pacific Northwest with Implications for Selecting Temperature Criteria |
| Spatial Representation: | Temperature was measured at one site located in the Golden Gate National Recreation Area upstream from Rodeo Lake. |
| Temporal Representation: | Temperature was recorded at 15 minute intervals over 9 to 21 days during late spring (June 2005), summer dry season (September 2005), and winter wet season (February 2006). |
| Environmental Conditions: | |
| QAPP Information: | All samples were collected and analyzed using procedures comparable with the SWAMP Quality Assurance Management Plan (SWRCB 2002). |
| QAPP Information Reference(s): | |
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| LOE ID: | 5760 |
| Pollutant: | Oxygen, Dissolved |
| 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: | PHYSICAL/CHEMICAL MONITORING |
| Data Used to Assess Water Quality: | Water quality assessment was conducted at Rodeo Creek as part of SWAMP study in 2005. Continuous field monitoring at 15 minute increments of temperature, dissolved oxygen, pH and specific conductance was conducted to determine temporal variability in basic water quality at one location.
The 7 day average minimum concentration of dissolved oxygen was 8.83 mg/L during dry season, 9.08 mg/L during spring season, and 11.03 mg/L during winter wet season. All DO measurements met the water quality objective of 7 mg/L. |
| Data Reference: | Data collected by the Surface Water Ambient Monitoring Program, San Francisco Bay Regional Water Quality Control Board. Years 4 and 5 Assessment |
| Water Quality Objective/Criterion: | The numeric water quality objective for dissolved oxygen is 7.0 mg/L minimum for waters designated as cold water habitat. The median dissolved oxygen concentration for any three consecutive months shall not be less than 80 percent of the dissolved oxygen content at saturation. |
| Objective/Criterion Reference: | San Francisco Bay Basin (Region 2) Water Quality Control Plan (Basin Plan) |
| Evaluation Guideline: | |
| Guideline Reference: | |
| Spatial Representation: | Dissolved oxygen concentrations were measured at one site located in the Golden Gate National Recreation Area upstream from Rodeo Lake. |
| Temporal Representation: | DO was recorded at 15 minute intervals over 9 to 21 days during late spring (June 2005), summer dry season (September 2005), and winter wet season (February 2006). |
| Environmental Conditions: | |
| QAPP Information: | All samples were collected and analyzed using procedures comparable with the SWAMP Quality Assurance Management Plan (SWRCB 2002). |
| QAPP Information Reference(s): | |