September 1, 1999August 2, 2026

Exhibit 717: Annual Stormwater Monitoring Report for Seattle-Tacoma International Airport, July 1998–June 1999

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Annual Stormwater Monitoring Report for Seattle-Tacoma International Airport (Sea-Tac Airport) covering July 1, 1998 through June 30, 1999, prepared by Port Of Seattle, September 1999 (AR 026459–AR 026461). Includes stormwater quality data tables for outfalls SDE4, SDS3, SDN1, and SDN4 with copper (CAS No. 7440-50-8) concentration measurements in micrograms per liter, hardness-dependent freshwater acute water quality standards (WQS) calculated per WAC 173-201A-040, dissolved fraction assuming partitioning coefficient p.c.=0.75, and multiples of acute WQS. Spreadsheet criteria analysis (CRITERIA.XLS) created by D. Nunnallee, revised 2/12/2002, references WAC 173-201A for copper water quality criteria with metals translators for freshwater and marine acute/chronic values. Water Resources Consulting LLC analysis dated 22 Feb 02.

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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