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EXH AR024775: Draft Memo Range-Finding WERs Miller and Des Moines Creeks

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Sea-Tac Airport
Third Runway
PCHB
Box 10

A February 2000 draft memorandum from Parametrix, Inc. outlines a scope and budget for range-finding Water-Effect Ratio (WER) studies using receiving water from Miller and Des Moines Creeks, conducted in connection with stormwater discharge permitting near the Port. The studies involve acute toxicity tests with copper-spiked water to determine whether site-specific water quality standards could be higher than generic state standards, potentially eliminating the need for a mixing zone. Estimated costs range from $2,110 for one creek site to $2,650 for two sites.

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Draft memorandum dated February 28, 2000, from Doug Henderson and Linda Logan of Parametrix, Inc. to Keith Smith (project 556-2912-001), regarding scope and budget for range-finding Water-Effect Ratios (WERs) using receiving water from Miller Creek and Des Moines Creek. Discusses copper WERs, LC50 determinations using acute Ceriodaphnia dubia toxicity tests, copper-spiked site water versus copper-spiked laboratory water, site-specific water quality standards (WQS), and mixing zone considerations. References February 23, 1999 range-finding studies with copper WERs of approximately 16 (Miller), 7 (Walker), and 15 (Des Moines) based on nominal total copper concentrations. Estimated costs for definitive acute tests range from $1,570 (one test set) to $2,650 (two sites, three acute tests). Filed in PCHB Third Runway EIS administrative record as AR024775–AR024777.

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