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Middle Fork Project AQ 11 – Water Quality Contingency Sampling Protocol (Contingency Study)

Middle Fork Project AQ 11 – Water Quality Contingency Sampling Protocol (Contingency Study). September 8, 2008. Introduction. Implemented AQ 11 – Water Quality Technical Study in Spring and Fall 2007 Characterized water quality conditions upstream and downstream from Project facilities.

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Middle Fork Project AQ 11 – Water Quality Contingency Sampling Protocol (Contingency Study)

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  1. Middle Fork ProjectAQ 11 – Water Quality Contingency Sampling Protocol(Contingency Study) September 8, 2008

  2. Introduction • Implemented AQ 11 – Water Quality Technical Study in Spring and Fall 2007 • Characterized water quality conditions upstream and downstream from Project facilities. • Included screening level of methylmercury concentrations in sport fish tissue muscle. • Numerous samples exceeded the OEHHA screening guidelines (0.08 ppm).

  3. Introduction • A Contingency Study Process was Specified in the AQ 11 - TSP • If methylmercury in fish tissue exceeds the OEHHA guidelines of 0.08 ppm (Cal EPA 2005; Klasing and Brodberg 2006) during the initial sampling, the Aquatic TWG will be consulted concerning the need for additional sampling. If additional sampling is deemed appropriate, a sampling protocol will be developed. • Aquatic TWG discussed study results during TWG Meetings and determined that additional fish tissue methylmercury sampling is warranted.

  4. Study Objective • Collect and sample additional methylmercury concentrations in sport fish muscle tissue following OEHHA guidelines that could be used to develop safe eating guidelines for the locations within the study area.

  5. 2008 Methylmercury Fish Sampling Locations • French Meadows Reservoir • Hellhole Reservoir • Ralston Afterbay • Middle Fork Interbay • Middle Fork American River at Otter Creek Characterize Project Facilities

  6. Study Approach • Collect and Sample Methylmercury From a Total of 9 to 12 Edible Sized Fish of Each Target Species 1 See Table AQ 11-2 for legal and/or edible size limits. 2 Low abundance of this species at the sampling location may make it difficult to collect the target number of individuals; a good-faith effort will be made to collect the target number of individuals.

  7. Study Approach • Table AQ 11-2. Legal and/or Edible Size Limits for Target Species.

  8. Study Approach • Catch fish using a combination of methods. • Gill nets, electrofishing, and hook-and-line • Notify and discuss with Aquatic TWG if the target number of individuals are not collected. • Submit fish to Brooks Rand Laboratory for individual fish muscle tissue analysis (minimum of 79 fish).

  9. Contingency Study Schedule

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