Notes
Draft memorandum (AR024703–AR024705) from Todd Pollard and Linda Logan of Parametrix, Inc. to Keith Smith, Port of Seattle, dated February 29, 2000, summarizing three categories of evidence that STIA stormwater does not impact aquatic life in Miller Creek and Des Moines Creek. Evidence includes: (1) Whole Effluent Toxicity (WET) testing on SDS outfalls SDS1, SDN4, SDS3, and SDE4 using Daphnia pulex and Pimephales promelas — three of four outfalls showed no acute toxicity; toxicity in SDN1 traced to zinc from galvanized rooftops; (2) Water Effect Ratio (WER) range-finding studies using copper-spiked site water from Miller, Walker, and Des Moines Creeks showing WERs of approximately 16, 7, and 15 respectively, demonstrating reduced copper bioavailability in receiving water; (3) metals monitoring on January 14, 1999 showing total and dissolved copper concentrations below water quality criteria and practical quantitation limit (PQL). Outfall SDS3 recorded highest total copper at 3.6 µg/L. Filed in PCHB Third Runway EIS administrative record.