TagPollution Control Hearings Board(1532)

Airport Communities Coalition (ACC) response to Citizens Against Sea-Tac Expansion (CASE) Motion to Intervene in PCHB No. 01-160, filed December 5, 2001 before the Pollution Control Hearings Board for the State of Washington. ACC does not object to CASE’s intervention but agrees it should not interfere with ACC’s pending Motion for Stay. Respondents are State

Letter dated December 5, 2001 from Sarah Suggs, Wetlands Specialist, Washington State Department of Ecology (Northwest Regional Office) to Grant Beck, Director, San Juan County Permit Center, regarding the Ayer property wetland restoration proposal on Orcas Island. Ecology characterizes the proposal as a wetland conversion (not restoration) under Chapter 90.48 RCW and Chapter 173-201A WAC,

Parametrix, Inc. December 2001 report for Port Of Seattle on Low Streamflow Analysis and Summer Low Flow Impact Offset Facility Proposal for the Seattle-Tacoma International Airport (STIA) Master Plan Update Improvements. Document AR018164, Exhibit 140. Covers HSPF model calibration, embankment modeling, non-hydrologic impacts (cessation of water withdrawals, removal of septic tank discharges), HEC-RAS modeling, vault

This report details the low streamflow analysis conducted for the Sea-Tac International Airport (STIA) Master Plan Update, including determination of critical summer low-streamflow periods for Miller, Walker, and Des Moines Creeks. The analysis used calibrated HSPF models to evaluate existing streamflow conditions and assess impacts from proposed construction projects, establishing target streamflows using 7-day, 2-year

This report, prepared by Parametrix, Inc. and several subconsultants for the Port of Seattle, presents a low streamflow analysis and a summer low flow impact offset facility proposal for the Seattle-Tacoma International Airport Master Plan Update Improvements. The document is Volume 1, including the main text and Appendices B through J. It was produced in

Report prepared by Parametrix, Inc. with Aqua Terra Consultants, Earth Tech, Inc., Foster Wheeler Environmental Corporation, HNTB, and Pacific Groundwater Group for Port Of Seattle regarding Sea-Tac Airport Master Plan Update Improvements. Analyzes summer low streamflow impacts to Walker Creek and Des Moines Creek from planned airport projects and proposes an offset facility using underground

This report, prepared for the Port of Seattle by Parametrix and associated consultants, analyzes low streamflow conditions associated with the Seattle-Tacoma International Airport Master Plan Update Improvements. It includes hydrologic modeling, assessment of embankment and non-hydrologic impacts to nearby creeks during summer low-flow periods, and proposes mitigation through a flow impact offset facility. The report

This report analyzes the timing and volume of discharges to local receiving streams and wetlands during low-flow periods from Seattle-Tacoma International Airport, considering improvements from the Port of Seattle’s Master Plan Update. It evaluates hydrologic impacts of the proposed third runway embankment on Miller, Walker, and Des Moines Creeks, and presents a Flow Impact Offset

This document presents 7-day low-flow calibration review data for Walker Creek and Des Moines Creek watersheds, comparing observed and simulated streamflows at multiple gage locations for water years 1991-1996. Results indicate calibrated low flows at stream mouths were generally accurate, while upstream gages showed lower predicted flows than observed, potentially due to speculative groundwater conditions.

Wetland Functional Assessment and Impact Analysis prepared by Parametrix, Inc. for Port Of Seattle, December 2001, project number 556-2912-001 (03). Assesses wetland functions and impacts associated with Seattle-Tacoma International Airport Master Plan Update Improvements including the new Third Runway, Runway Safety Areas (RSAs), relocation of South 154th Street, Borrow Area 1 excavation, South Aviation Support