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Lake Chelan DDT and PCBs in Fish Total Maximum Daily Load Study

Publication number Date Published
05-03-014June 2005
VIEW NOW Lake Chelan DDT and PCBs in Fish Total Maximum Daily Load Study (Number of pages: 141) (Publication Size: 1MB)

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Author(s) Coots, R. and B. Era-Miller
Description A TMDL study of Lake Chelan and Roses Lake fish was conducted to address section 303(d) listings for 4,4’-DDE, PCB-1254, and PCB-1260 in edible fish tissue. Resident fish, surface water, and sediments were analyzed for DDT and its metabolites as well as for PCBs.

Total DDT in tissue ranged from 6 - 2,400 ug/Kg, with the highest concentrations found in mackinaw (lake trout). PCBs were generally low in all matrices. To meet water quality targets for total DDT, Wapato basin mackinaw need a 97% reduction and Roses Lake rainbow trout a 67% reduction in total DDT concentrations. Tributaries and drains discharging to the Wapato basin will need total DDT reductions up to 97%.

Errata: On December 29, 2006, corrections to this report were made, which lowered the estimated water column concentrations of DDT and PCBs for the lake. The USGS spreadsheet calculator used to estimate water concentrations from SPMD results was found to have an error. This resulted in overestimating water column concentrations by a factor of 5.
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Keywords toxics monitoring, sampling, lakes, fish, 303(d), basin, water, Total Maximum Daily Load, PCBs, lake, DDT
WATERSHED Water Resource Inventory Area 47 Chelan
DATA Environmental Information Management (EIM) #RCOO0004


Lake Chelan Watershed DDT and PCB Total Maximum Daily Load: Water Quality Improvement Report

Quality Assurance Project Plan: Total Maximum Daily Load Study for DDT and PCBs in Lake Chelan