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Water Quality Contingency Sampling Protocol for the Middle Fork American River Project

This document outlines the Water Quality Contingency Sampling Protocol (AQ 11) for the Middle Fork American River Project, addressing the sampling methodology for edible-sized sport fish and crayfish in 2007 and 2008. It includes specifications for target species, sampling locations, and the analysis of methylmercury concentrations in fish tissues. Key findings regarding sport fish populations and compliance with EPA guidelines are highlighted. It is essential for maintaining environmental health and ensuring safe fish consumption in the area.

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Water Quality Contingency Sampling Protocol for the Middle Fork American River Project

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  1. Placer County Water AgencyMiddle Fork American River ProjectAQ 11 – Water Quality Contingency Sampling Protocol(Contingency Study) February 3, 2009

  2. 2007 and 2008 Sampling Locations

  3. AQ 11 – TSP Study • 10 sport fish of edible size • 5 each of two different species (if present) • Species priority ranking: 1) Bass, 2) Pikeminnow, 3) Lake Trout, 4) Brown Trout, 5) Rainbow Trout AQ 11 – TSP Contingency Study • 9 - 12 of each target sport fish of edible size • PCWA to consult with Aquatic TWG if unable to collect target number of individuals

  4. 2008 Edible Size Limits for Target Species(Note: some fish sampled in 2007 smaller than 2008 min. size)

  5. Methylmercury Fish Sampling Locations and Target Number of Fish 1 Fish were analyzed as 1 composite in 2007. 2 Fish were analyzed in 2007, but were smaller than the 2008 legal and edible-size limit (see Table AQ 11-2).

  6. Fish and Crayfish Muscle Tissue Analysis Results 2007 and 2008

  7. EPA Guideline: 0.3 ppm OEHHA Screening Level: 0.08 ppm Fish and Crayfish Muscle Tissue Analysis Results 2007 and 2008 (zoom in)

  8. Average Methylmercury Concentrations (mg/kg-fish) and Number of Fish and Crayfish Individual fish analyses of 2008 edible size ONLY Bold values indicate screening value of 0.08 mg/Kg were exceeded (Cal EPA 2005; Klasing and Brodberg 2006).

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