TagACC(1548)

Washington State Department of Ecology’s response to Citizens Against Sea-Tac Expansion (CASE) motion to intervene in PCHB No. 01-160, Airport Communities Coalition (ACC) v. State of Washington Department of Ecology and Port Of Seattle. Ecology concurs with Port Of Seattle’s requested limits on intervention and does not oppose CASE’s motion. Filed December 10, 2001; signed

Notice of Association of Counsel filed December 10, 2001 in PCHB No. 01-160, before the Pollution Control Hearings Board, State of Washington. Jeff B. Kray, Assistant Attorney General, Ecology Division, associates with Joan M. Marchioro and Thomas J. Young to represent the Washington State Department of Ecology. Appellant is Airport Communities Coalition; respondents are State

In December 2001, Ann Kenny of the Washington Department of Ecology's Northwest Regional Office drafted a memo requesting that hydrogeologist Ching-Pi Wang review a groundwater and seepage monitoring plan submitted by the Port of Seattle for the proposed third runway at Seattle-Tacoma International Airport. The plan, titled 'Third Runway Embankment Seepage and Groundwater Monitoring Plan,' was submitted on November 16, 2001, and required expert review before Ecology could approve it. Wang was asked to provide written comments on the plan's adequacy and any recommended changes by January 18, 2002.

Port Of Seattle response filed December 6, 2001 to motion to intervene by Citizens Against Sea-Tac Expansion (CASE) in Pollution Control Hearings Board (PCHB) Case No. 01-160, Airport Communities Coalition (ACC) v. Department of Ecology and Port Of Seattle. Port does not oppose CASE intervention if limited under WAC 371-08-420(1): CASE barred from raising new

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. report prepared for Port of Seattle, Seattle-Tacoma International Airport Master Plan Update Improvements, December 2001. AR 052659/052660/052661. Volume 1 includes main text and Appendices B through J. Sub-consultants include Aqua Terra Consultants, Earth Tech Inc., Foster Wheeler Environmental Corporation, HNTB, and Pacific Groundwater Group. Addresses low streamflow analysis and summer low flow impact

This technical document compares observed and model-predicted 7-day low streamflows for Walker Creek and Des Moines Creek near Seattle-Tacoma Airport for water years 1991–1996. Results show that calibrated (simulated) flows generally underestimated observed flows at most gage locations, with the exception of 1995, when the model overpredicted flows. Discrepancies at upstream gage locations are attributed to uncertain groundwater conditions within the watersheds.

This technical report analyzes low streamflow conditions in three creeks near Seattle-Tacoma International Airport (Miller, Walker, and Des Moines Creeks) to assess the potential impacts of airport construction projects on summer water flows. Using a 47-year record of streamflow data and computer modeling tools, analysts determined target streamflow levels for each creek and evaluated how proposed runway and infrastructure improvements might affect seasonal low-flow periods critical to salmon habitat. The study found existing summer low streamflow targets of 0.33 cfs for Des Moines Creek, 0.77 cfs for Walker Creek, and 0.73 cfs for Miller Creek, which were used to guide mitigation planning.

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