August 7, 2001August 2, 2026

Exhibit 2012: Ecology Memorandum — Review of “Low Flow Analysis, Flow Impact Offset Facility Proposal, Port Of Seattle” by Parametrix Inc., July 2001

Notes

Memorandum dated August 7, 2001 from Dave Garland, NWRO Water Quality Watershed Unit Supervisor, Washington State Department of Ecology, to Ann Kenny, Kevin Fitzpatrick, and Ray Hellwig, reviewing Parametrix Inc.’s July 2001 “Low Flow Analysis, Flow Impact Offset Facility Proposal” prepared for the Port Of Seattle regarding the proposed third runway at Sea-Tac Airport. Reviews impacts on late summer streamflows in Miller Creek, Walker Creek, and Des Moines Creek using 47 years of streamflow records and HSPF streamflow models. References Pacific Groundwater Group ‘slice model’ (PGG June 2000), Earth Tech December 2000 low streamflow analysis, and King County Department of Natural Resources review comments (August 3, 2001). Non-hydrologic impact estimates show net reductions: Miller Creek from .04 cfs to -.02 cfs, Walker Creek from 0.0 cfs to -.01 cfs. Exhibit-2012, AR 029274.

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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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