TagACC(1531)

Report by Pacific Groundwater Group (project JE0105) prepared for Port Of Seattle, dated November 27, 2001, analyzing embankment fill modeling in support of low streamflow analysis for the Sea-Tac Third Runway. Uses HYDRUS-SLICE modeling to assess vertical infiltration through embankment fill materials (General Fill and Type 1 Fill), saturated flow beneath the fill, and effective

Pollution Control Hearings Board (PCHB) order in PCHB 01-160, Airport Communities Coalition (ACC) v. State of Washington Department of Ecology and Port Of Seattle. On reconsideration of the October 10, 2001 order granting Ecology’s motion to strike, the Board addresses inadvertent disclosure of an attorney-client privileged briefing paper prepared by Ecology NW Regional Director Ray

Port Of Seattle’s response to Airport Communities Coalition (ACC) motion to supplement the record in PCHB Case No. 01-160, filed November 26, 2001. Port argues ACC’s hearsay emails and Keith Smith letter regarding revisions to the Low Streamflow Analysis do not warrant supplementing the record on the motion to stay. Document addresses HSPF groundwater model

This legal declaration by stormwater engineer Paul S. Fendt, filed before Washington's Pollution Control Hearings Board, addresses the Port of Seattle's Master Plan Update and its potential impacts on local stream flows in Miller, Walker, and Des Moines Creeks near Sea-Tac Airport. Fendt explains the use of the HSPF hydrologic model and a 2-year, 7-day low flow standard to assess and mitigate summer streamflow impacts resulting from planned airport expansion projects. He concludes that revised analysis shows no significant changes to previously calculated low flow impacts.

Letter dated November 26, 2001, from Northwest Hydraulic Consultants (on behalf of ACC, Airport Communities Coalition) to Colonel Ralph H. Graves, Ms. Muffy Walker, and Ms. Gail Terzi of U.S. Army Corps of Engineers, Seattle District, Corps Ref. No. 1996-4-02325. Identifies serious flaws in Port Of Seattle’s low flow mitigation analysis for Miller Creek, Walker

Declaration by Roger A. Pearce, attorney for Port Of Seattle, filed in Pollution Control Hearings Board (PCHB) Case No. 01-160, Airport Communities Coalition v. Department of Ecology and Port Of Seattle. Identifies four exhibits submitted to Washington Department of Ecology under amended §401 Certification on JARPA Application No. 1996-4-02325: Exhibit A (Wetland A17 Restoration Plan,

Third Declaration of Paul S. Fendt (Parametrix, Inc.) filed in PCHB No. 01-160, Airport Communities Coalition v. Department of Ecology and Port Of Seattle. Fendt, licensed PE with 18+ years stormwater engineering experience, addresses calculation of summer low streamflow impacts on Miller Creek, Walker Creek, and Des Moines Creek for the Port Of Seattle Master

This 2001 legal declaration by civil engineer William Rozeboom, submitted to Washington's Pollution Control Hearings Board, challenges the Port of Seattle's stormwater and low-flow mitigation plans for the proposed third runway at Sea-Tac Airport. Rozeboom argues that the Port's analysis underestimates low-flow impacts on local streams and that the proposed underground storage vaults—equivalent in volume to more than seven Olympic-size swimming pools—are undersized. The declaration also disputes claims by Port engineer Paul Fendt that the water volumes involved are small and that mitigation can be easily adjusted.

Second Pre-Hearing Order issued by the Pollution Control Hearings Board (PCHB) in case PCHB No. 01-160, Airport Communities Coalition (ACC) v. State of Washington Department of Ecology and Port Of Seattle. Accepts 21 stipulated legal issues and adds issue 22 regarding Ecology’s reasonable assurance under §401 and applicable water quality laws concerning a stormwater detention

A November 2001 letter from Northwest Hydraulic Consultants, written on behalf of the Airport Communities Coalition, raises serious technical objections to the Port of Seattle's proposed plan to manage low streamflow impacts from SeaTac Airport's third runway construction on Miller, Walker, and Des Moines Creeks. The letter argues that the Port's analysis contains critical flaws, including an incorrect assumption that virtually all runway runoff infiltrates into adjacent grassed filter strips, and that the use of hourly rather than shorter time intervals in hydrological modeling causes stream impacts to be underestimated and mitigation storage facilities to be undersized. The consultants also express concern that the Port was not adequately addressing outstanding public comments or certification requirements set by regulatory agencies such as the Washington Department of Ecology.