TagDes Moines Creek(162)

This figure (2.1-3) is a map showing wetlands located in the Des Moines Creek Basin near Seattle-Tacoma International Airport (STIA). It identifies delineated wetlands verified by the Army Corps of Engineers (ACOE), water features, streams, and piped streams across the area, with individual wetlands labeled by alphanumeric codes. The map was submitted as part of a supplemental natural resources mitigation plan related to airport development activities in the region.

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

Handwritten notes dated 2/22/02 from a telephone call with Eliz. Leavitt outline five follow-up issues, including evaluation of biological impacts after implementation (involving USFWS/NMFS), a 60-day Walker Creek matter related to WL 44A, a July Des Moines Creek discussion about vaults of the same size, pH vault monitoring and recent science/technical papers, and concerns about how float vaults are designed.

Pre-filed testimony of Thomas R. Luster submitted on behalf of Airport Communities Coalition (ACC) in PCHB No. 01-160, ACC & CASE v. Department of Ecology & Port of Seattle, dated February 22, 2002. Luster, formerly Ecology’s senior expert on water quality certifications, challenges the Section 401 Clean Water Act certification issued by Ecology for Sea-Tac

This document is an agenda for a Low Streamflow Analysis Meeting held on February 19, 2002, at the Department of Ecology in Bellevue, Washington. The meeting covered technical modeling and water flow topics for three local waterways — Walker Creek, Miller Creek, and Des Moines Creek — including reviews of land cover tables, groundwater routing, and calibration. General topics such as water quality monitoring, channel hydraulics, and embankment modeling were also on the agenda.

This February 2002 supplement lists the technical documents relied upon by environmental scientist John A. Strand, Ph.D., when assessing the potential environmental impacts of proposed improvements outlined in Seattle-Tacoma International Airport's Master Plan Update. The documents primarily consist of laboratory analysis letters from Columbia Analytical Services and Analytical Resources, Inc., covering water quality sampling results collected between 2000 and 2002. An email regarding turbidity measurements in Des Moines Creek is also included, suggesting a focus on water quality impacts near the airport.

An email dated February 8, 2002, from Peter Willing to John Strand reports turbidity measurements taken during a site visit at Sea-Tac on January 28, 2002, between 11:45 and 12:08. Two samples were recorded: Sample #1 showed tank farm outfall at 281 NTU and DM Creek at 31 NTU, while Sample #2 showed tank farm outfall at 299 NTU and DM Creek at 31.2 NTU. The data indicates significantly elevated turbidity levels at the tank farm outfall compared to the creek reference point.

Declaration of Kelly Whiting, Senior Engineer at King County Department of Natural Resources, filed before the Pollution Control Hearings Board (PCHB No. 01-133) in Airport Communities Coalition v. State of Washington Department of Ecology and Port Of Seattle. Whiting reviewed the Port Of Seattle’s Comprehensive Stormwater Management Plan (SMP) for Master Plan Update Improvements at

Memorandum dated December 12, 2001 from Michael Kenrick and Reese Hastings of Hart Crowser Inc. to Jim Thomson of HNTB, project number 4978-62, analyzing pre-construction and post-construction hydrologic conditions at Borrow Area 1 associated with the Port of Seattle Master Plan Update for Sea-Tac International Airport (STIA). Covers surface water and groundwater impacts, wetland hydrology,

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.