Notes
Declaration of Joseph Brascher of Aqua Terra Consultants, filed in PCHB case No. 01-133, Airport Communities Coalition v. Department of Ecology and Port Of Seattle. Brascher describes Aqua Terra’s role as subconsultant to Parametrix, Inc. in preparing the Low Flow Analysis Flow Impact Offset Facility Proposal submitted to Washington State Department of Ecology in July 2001. Details the use of the Hydrologic Simulation Program – Fortran (HSPF) model to simulate stormwater runoff and assess hydrologic impacts on Miller Creek and Walker Creek associated with Port Of Seattle Master Plan Update (MPU) construction at Seattle-Tacoma International Airport (STIA). Covers HSPF model calibration, EPA and USGS use of HSPF, Aqua Terra’s development of the Western Washington Hydrology Model (WWHM) for Ecology’s 2001 draft stormwater manual, and conditions of Ecology’s §401 Certification requiring an updated Low Flow Analysis including reserve vault design details, additional monitoring, and infiltration testing.