Notes
Exhibit 264 (AR 019459), prepared by Parametrix, Inc. with Aqua Terra Consultants, Earth Tech, Foster Wheeler Environmental Corporation, HNTB, and Pacific Groundwater Group for Port Of Seattle, December 2001. Technical report analyzing summer low streamflow impacts from Seattle-Tacoma International Airport Master Plan Update Improvements (STIA MPU), including HSPF hydrologic model calibration, embankment modeling, non-hydrologic impacts (cessation of water withdrawals, removal of septic tank discharges), HEC-RAS water level modeling, and net flow impacts to creeks. Proposes a summer low flow impact offset facility (reserve stormwater release vault), with vault sizing analysis, water quality design addressing turbidity, temperature, dissolved oxygen, nutrients, and metals, plus a pilot program, operation and maintenance plan, biological monitoring (B-IBI), fill infiltration BMPs, and adaptive management. Filed with Washington State Department of Ecology; document is part of PCHB third-runway EIS administrative record.