Placer County Water Agency Middle Fork American River Project AQ 11 – Water Quality Contingency Sampling Protocol (Contingency Study) February 3, 2009.

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Presentation transcript:

Placer County Water Agency Middle Fork American River Project AQ 11 – Water Quality Contingency Sampling Protocol (Contingency Study) February 3, 2009

2007 and 2008 Sampling Locations

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 of each target sport fish of edible size PCWA to consult with Aquatic TWG if unable to collect target number of individuals

2008 Edible Size Limits for Target Species (Note: some fish sampled in 2007 smaller than 2008 min. size) SpeciesMinimum Size (mm) Brown Trout200 Rainbow Trout200 Lake Trout350 Kokanee200 Sacramento Pikeminnow250 Crayfish30

Methylmercury Fish Sampling Locations and Target Number of Fish Sampling Location SpeciesTotal Analyzed Fish Remaining PCWA Proposed French Meadows Reservoir BNT12 (5) RBT3 (5) 1 66 CrayFish120-- Hell Hole Reservoir BNT120-- LT3 (2) 2 66 KOK120-- RBT180 CrayFish120-- Middle Fork Interbay BNT120-- RBT90-- Ralston Afterbay BNT120-- RBT720 SPM4 (1) 2 NA Middle Fork American River (Otter Creek) BNT188 RBT Fish were analyzed as 1 composite in Fish were analyzed in 2007, but were smaller than the 2008 legal and edible-size limit (see Table AQ 11-2).

Fish and Crayfish Muscle Tissue Analysis Results 2007 and 2008

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

Average Methylmercury Concentrations (mg/kg-fish) and Number of Fish and Crayfish Fish Species French Meadows Hell Hole MFAM at Otter Creek Middle Fork Interbay Ralston Afterbay Brown Trout (No.) (12) 1.03 (12) (1) (12) (12) Lake Trout (No.) (3) --- Rainbow Trout (No.) (3) (1) (11) (9) (7) Kokanee (No.) (12) --- Crayfish (No.) (12) (12) --- Sac Pikeminnow (No.) (4) 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).