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The purpose of this task is to improve the estimates of the loadings of toxic chemicals from combined sewer overflows (CSOs) to Puget Sound by collecting and analyzing additional environmental samples with more sensitive detection methods. Work to be accomplished includes:
(a) From the approximately 205 existing CSOs to Puget Sound, identify 20 representative CSOs, and divide them into the following three groups: outfalls manned on-site by publicly owned treatment works (POTW) operators, outfalls where auto-samplers can operate, and outfalls that must be sampled manually. The selected CSOs will represent both untreated and partially treated discharges.
(b) Collect two samples from each CSO, and analyze the samples for the chemicals of concern (identified in the Phase 1 report).
(c) Integrate the results of the analyses with the results from previous phases to refine the estimates of the total loadings of toxic chemicals from CSOs to Puget Sound.
For more information, contact Jim Maroncelli at 360-407-6588.
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