TagPollution Control Hearings Board(1532)

Final draft meeting notes from July 5, 2001 technical meeting on 401 Permit Decision-Making for the Sea-Tac Airport Third Runway, prepared by Rachel McCrea of Floyd & Snider Inc. Attendees include Ann Kenny (Dept. of Ecology), Kelly Whiting (King County), Keith Smith (Port of Seattle), Felix Kristanovich (Foster Wheeler), Paul Fendt and Tom Atkins (Parametrix),

Water Resources Consulting LLC, engaged by the Airport Communities Coalition, responds to the Port of Seattle’s April 30, 2001 reply to earlier 401/404 permit comments regarding stormwater management at Sea-Tac Airport. The document challenges Port claims about impervious area increases, hydrologic divide changes affecting Miller, Des Moines, and Walker Creeks, and the effectiveness of biofiltration

An email chain discussing the non-hydrologic effects of water rights relinquishments on summer low flows, as part of an environmental review process. Kelly Whiting of Metro King County raises concerns about how water withdrawal data for survey non-respondents was handled, suggesting the assumptions overestimate withdrawal rates. The email requests a walkthrough of how these numbers

An email from Kelly Whiting of King County Department of Natural Resources to Ann Kenny summarizing recommendations from a lead stream ecologist regarding proposed stream mitigation measures. The ecologist’s key concerns include evaluating mitigation against existing stream hydrographs to avoid disrupting biological processes, prioritizing frequent low-flow conditions over extreme drought scenarios, and addressing water quality

Port Of Seattle memo opposing Airport Communities Coalition (ACC) motion for stay in PCHB No. 01-133, Volume 2 of 3, containing Declaration of Paul S. Fendt and SMP Volume 3 materials. Includes preface to the Comprehensive Stormwater Management Plan (SMP) for Seattle-Tacoma International Airport Master Plan Update Improvements, July 2001, with replacement pages developed in

This table summarizes drainage area data for Miller Creek, Walker Creek, and Des Moines Creek subbasins at Sea-Tac International Airport (STIA), comparing 1994 baseline and 2006 future condition impervious and pervious acreages. It documents the increase in impervious area across all drainage basins, with a total increase of 305.7 acres. The data was compiled as

Section 5 of the Sea-Tac Airport Comprehensive Stormwater Management Plan discusses proposed Master Plan Update (MPU) improvements requiring stormwater management, including land use changes and impervious surface calculations. The document covers the Airport Surveillance Radar relocation, GIS-based analysis of pervious and impervious areas, and references to HSPF modeling. MPU improvements are organized into four phases

Table A-3 from the Sea-Tac Airport Comprehensive Stormwater Management Plan lists projects requiring stormwater management as part of the STIA Master Plan Update Improvements. The table details construction timelines, whether permanent stormwater detention was provided, facility names, and comments on impervious surface conditions for runway, taxiway, terminal, and landside improvement projects. Projects span from the

This document describes the Integrated Wetland System (IWS) configuration for the Sea-Tac International Airport Master Plan Update, including land use, storage volumes, treatment rates, and discharge capacity. It presents analysis showing zero overflows occur under proposed IWS conditions when simulated over a 50-year KCRTS period of record. The document also notes a historical overflow event

STIA construction site stormwater monitoring report dated 6/28/01, sampled by K. Ludwa and J. Brandt. Documents monitoring of multiple construction sites including Third Runway Embankment Phase 4, S. 160th St. Detention Ponds, S. 157th Pl. Detention Pond, North Safety Fill Construction, Third Runway Embankment Phase 3, North Runway Embankment Phase 3, Wetland 44a, Lonistic Site