TagStormwater(373)

This February 2002 draft document from King County Department of Natural Resources presents technical review comments on the Port of Seattle's December 2001 Low Streamflow Analysis and Summer Low Flow Impact Offset Facility Proposal. The review identifies several deficiencies in the hydrologic modeling for Walker Creek and Miller Creek, including inconsistencies in impervious area calculations, questionable vault-filling timelines, and concerns about the accuracy of observed streamflow data used for calibration. King County recommends additional refinements before approving the revised impact numbers, and suggests that Ecology and the Port establish a formal compliance oversight process.

King County Department of Natural Resources draft review comments (AR034844-034846) on the Port Of Seattle / Parametrix Inc. December 2001 Low Streamflow Analysis – Summer Low Flow Impact Offset Facility Proposal. Review evaluates HSPF hydrologic modeling, impact assessment, and conceptual design of low-flow offset facilities for Miller Creek and Walker Creek against Washington State Department

NPDES Discharge Monitoring Report (DMR) filed by Port Of Seattle for Sea-Tac Airport under permit WA-002465-1, discharge number 001, monitoring period December 1–31, 2001. Parameters reported include flow (max 4,500–4,800 gpm), pH, oil and grease, TSS, BOD5, total glycols, TPH, fecal coliform, priority pollutants, and SCAN results. Signed by Michael D. Feldman, Director of Aviation

Pre-filed testimony of Keith Malcolm Leytham, Professional Civil Engineer and Professional Hydrologist with Northwest Hydraulic Consultants (nhc), submitted on behalf of appellant Airport Communities Coalition (ACC) in PCHB No. 01-160, ACC & CASE v. Dept. of Ecology & Port Of Seattle, dated February 22, 2002. Leytham testifies regarding stormwater facilities, streamflow impacts, surface water hydrology,

Pre-filed testimony of William A. Rozeboom, professional civil engineer with Northwest Hydraulic Consultants, submitted on behalf of Airport Communities Coalition (ACC) in PCHB No. 01-160, ACC & CASE v. Dept. of Ecology & Port Of Seattle, February 22, 2002. Rozeboom testifies regarding stormwater facilities, streamflow impacts, drainage plans, post-construction monitoring, and stormwater management plans related

Pre-filed written testimony of Dr. John Strand, Ph.D. (Principal Biologist, Columbia Biological Assessments; Adjunct Professor, Washington State University Tri-Cities), submitted on behalf of Appellant Airport Communities Coalition (ACC) in PCHB No. 01-160, ACC & CASE v. Dept. of Ecology & Port of Seattle, dated February 22, 2002. Strand’s testimony covers ecological risk assessment of stormwater

AR 053453. Map prepared by Parametrix, Inc. dated February 19, 2002, depicting future subbasins, watersheds, and detention facilities at Sea-Tac Airport. Shows water features including Miller Creek, Old Madres Creek, Walker Creek, detention facilities, proposed stormwater management facilities, reactive low-flow vaults and infiltration facilities, Master Plan impervious surfaces, future watershed boundaries, future subbasin boundaries, discharge

This document is a map from the Port of Seattle showing the comprehensive storm drainage system plan and drainage basins for the Seattle port facility. It identifies stormwater drainage basin color codes, outfall locations, and pump station locations across the property. The figure was entered as Exhibit 379A on February 18, 2002, in proceedings recorded by C. Mangio, RMR, CRR.

This document is a list of environmental and regulatory records relied upon by Greg Wingard, covering Seattle-Tacoma International Airport (Sea-Tac) operations from the 1980s through 2002. It includes NPDES discharge monitoring reports, stormwater management plans, groundwater contamination assessments, and industrial wastewater treatment evaluations involving the Port of Seattle (POS) and various airline tenants such as Alaska Airlines and Northwest Airlines. The records primarily address water quality, stormwater runoff, fuel spills, and environmental compliance at the airport.

This document is a professional curriculum vitae for Dr. K.M. Leytham, Ph.D., P.E., an engineering hydrologist with extensive experience in flood analysis, stormwater management, and catchment hydrology modeling. Dr. Leytham holds degrees from the University of Birmingham, MIT, and the University of Washington, and has worked on projects across North America and internationally. His project experience includes dam safety reviews, flood reduction studies, and reservoir inflow analyses, primarily with Northwest Hydraulic Consultants in Seattle.