TagKing County(456)

Meeting notes from an October 30, 2001 technical session addressing errors discovered in the low streamflow modeling for Sea-Tac International Airport's Third Runway project. Consultants identified six modeling errors, including a conversion factor mistake that caused embankment flow contributions to be understated by a factor of 24, along with incorrect input files and improper groundwater routing. Representatives from the Port of Seattle, King County, the Department of Ecology, and the Army Corps of Engineers agreed on corrective revisions to be incorporated into a revised Low Streamflow Analysis and Summer Low Flow Impact Offset Facility Proposal required under the 401 Permit.

Email from Kelly Whiting (King County Department of Natural Resources, Water and Land Resources Division) to Ann Kenny and Raymond Hellwig, dated October 25, 2001, summarizing a pre-meeting briefing on revised low flow hydrologic modeling related to Port Of Seattle airport embankment impacts. Discusses Hydrocomp (Norm Crawford) independent review findings, HSPF modeling errors including incorrect

Email chain dated October 19, 2001 among Kathryn Snider (Floyd Snider McCarthy, Inc.), Kelly Whiting (Metro King County), Ann Kenny, Keith Smith (Port Of Seattle Water Resources Manager), and David Masters regarding a proposed Low Flow Meeting scheduled for October 30, 2001 at Kate Snider’s office (8:30–11:30 AM). Kelly Whiting requests a meeting agenda or

PCHB case No. 01-133, Volume 3 of 3 of Port Of Seattle’s memorandum opposing Airport Communities Coalition (ACC) motion for stay, containing Declaration of Paul S. Fendt. Includes August 3, 2001 letter from King County Department of Natural Resources to Ann Kenny, Senior Permit Specialist, Washington Department of Ecology Northwest Regional Office, Bellevue WA 98008-54552,

Declaration of Edward O’Brien, Washington Department of Ecology Water Quality Program employee since 1979, filed in PCHB No. 01-133 (Airport Communities Coalition v. State of Washington Department of Ecology and Port Of Seattle). O’Brien describes his familiarity with the 1992 Stormwater Management Manual for Puget Sound, the 1999 Draft Manual, and the final September 27,

This document is an email chain from September 2001 in which King County's David Masters notifies Ann Kenny that spending on a contract for technical review services provided to the Washington State Department of Ecology has exceeded its $95,000 limit by $23,695. Masters proposes amending the contract to increase the budget by $170,000 to a new total of $265,000, covering anticipated work such as low-flow analysis, preparation of appeal materials, and potential expert witness testimony. Ann Kenny forwarded the information to Michael Cheyne to facilitate the contract amendment process.

Letter dated August 3, 2001 from Pam Bissonnette, Director of King County Department of Natural Resources, to Ann Kenny, Senior Permit Specialist at Washington Department of Ecology Northwest Regional Office, conveying King County’s technical review findings on the Port Of Seattle’s Comprehensive Stormwater Management Plan (SMP) for Master Plan Update (MPU) Improvements at Seattle-Tacoma International

In August 2001, King County's Department of Natural Resources wrote to the Washington Department of Ecology confirming that the Port of Seattle's Comprehensive Stormwater Management Plan for Sea-Tac International Airport Master Plan improvements met the technical requirements of the 1998 King County Surface Water Design Manual. The review found that the plan demonstrated a feasible conceptual strategy for managing stormwater from proposed airport construction projects. Reviewers noted that while the plan showed compliance with design standards, additional oversight and monitoring would be needed as individual projects moved from planning into construction.

In August 2001, King County's Department of Natural Resources submitted a technical review letter to the Washington Department of Ecology evaluating the Port of Seattle's Low Flow Impact Analysis and proposed offset facilities for stormwater management near Sea-Tac Airport. The review found the proposal goes well beyond the basic requirements of the King County Surface Water Design Manual and represents substantial mitigation for low flow impacts in affected drainage basins, including Miller and Walker Creeks. Reviewers noted several inconsistencies and data gaps in the documentation and recommended that a final consolidated document be prepared incorporating all corrections and technical memoranda.

Letter dated August 3, 2001 from King County Department of Natural Resources Director Pam Bissonnette to Ann Kenny, Senior Permit Specialist, Washington Department of Ecology Northwest Regional Office, transmitting King County’s technical review comments on the Port Of Seattle’s Low Flow Impact Analysis – Low Flow Impact Offset Facility Proposal (July 2001). The enclosure provides