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EXH AR026684: Site-Specific Water Quality Standard Copper Bioassay Status RP

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Sea-Tac Airport
Third Runway
PCHB
Box 10

This 2001 draft report by Parametrix, Inc. describes a water quality study conducted for the Port of Seattle to assess the feasibility of meeting state water quality standards following construction of a third runway at Seattle-Tacoma International Airport. The study focused on developing a site-specific water-effect ratio (WER) for copper in Miller, Walker, and Des Moines Creeks by conducting toxicity bioassays on stormwater samples collected during storm events. The report summarizes results from initial screening and range-finding phases, with the final site-specific water quality standard still pending completion at the time of publication.

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Draft bioassay status report (AR 026684) prepared by Parametrix, Inc. for Port Of Seattle, Seattle-Tacoma International Airport, April 2001, regarding development of a site-specific water quality standard for copper using a water-effect ratio (WER). Documents results of screening-level toxicity tests and range-finding bioassays using Ceriodaphnia dubia and Daphnia magna in Miller Creek, Walker Creek, and Des Moines Creek in connection with third runway construction at STIA. Testing conducted at Parametrix Environmental Toxicology Laboratory, Kirkland, Washington, per U.S. EPA 1993 and WDOE 1995 protocols. Filed in PCHB third-runway-eis administrative record.

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