TagDes Moines(254)

Letter dated August 18, 2000 from Keith R. Smith, Water Resources Manager at Port Of Seattle (Seattle-Tacoma International Airport), to Jillian Hoyt of Seattle Public Utilities, regarding the Des Moines Creek Basin Plan Flow Augmentation Facility. The Port seeks to purchase water from SPU as an alternate supply for the proposed flow augmentation facility, which

A draft memorandum dated April 2000 summarizes range-finding water-effect ratio (WER) toxicity tests conducted for the Port of Seattle to measure copper levels in streams receiving stormwater runoff from Seattle-Tacoma International Airport (STIA). Water samples were collected from five sites — including Miller Creek and Des Moines Creek — during a storm event on April 15, 2000, and tested using Daphnia magna organisms to compare copper toxicity in site water versus clean laboratory water. The results were intended to determine whether more expensive definitive WER studies would be warranted, and to help establish site-specific water quality standards for copper.

Field Sampling Data Forms (AR 027906–027908) documenting environmental sampling at Miller Creek and Des Moines Creek survey sites including 144th St S and S 157th Pl, dated April 17, 2000. Water quality measurements recorded: temperature 53.2°F/11.0°C and 49.5°C (4/19), pH 7.5, dissolved oxygen 9.5/100, hardness 84 PPM CaCO3 (site IA) and 120 ppm (site IB).

A February 2000 internal draft memorandum from environmental consultants to Port of Seattle staff summarizes efforts to develop a site-specific water quality criterion for copper in Miller, Walker, and Des Moines Creeks, in connection with stormwater runoff anticipated from a proposed third runway at Sea-Tac Airport. The memo evaluates two technical approaches—the Water-Effect Ratio (WER) and the site-specific metals translator—for potentially raising copper discharge permit limits, and outlines initial toxicity screening and range-finding study results. It also describes ongoing negotiations with the Washington State Department of Ecology regarding unresolved issues such as mixing zones, AKART requirements, and critical sampling conditions.

A February 2000 draft memorandum from environmental consultants to Keith Smith summarizes efforts to develop a site-specific water quality criterion for copper in Miller, Walker, and Des Moines Creeks near Seattle-Tacoma Airport, in anticipation of stormwater runoff from a proposed third runway. The memo outlines two technical approaches—the Water-Effect Ratio (WER) and the site-specific metals translator—for potentially raising copper discharge permit limits, and describes toxicity screening and range-finding studies conducted in 1999. The phased study approach was designed to avoid unnecessary costs if the WER method proved infeasible or if the Washington Department of Ecology would not permit its use in adjusting permit limits.

Addendum to the Des Moines Creek Regional Capital Improvement Project Preliminary Design Report, prepared November 1, 1999 by King County Capital Improvement Project Design Team for the Des Moines Creek Basin Committee. Prepared for Tim Heydon (City of Des Moines), Tom Hubbard (Port Of Seattle), David Masters (King County), Don Monaghan (City of SeaTac), and

Memorandum dated July 9, 1999 from Reese P. Hastings and Michael J. Bailey, P.E. (Hart Crowser, Inc.) to Barbara Hinkle, Port Of Seattle, regarding Third Runway Project Borrow Areas 1, 3, and 4 and projected impacts to wetlands. Document J-4978-02 quantifies potential wetland resource impacts from excavation of borrow areas providing 7.9 million bank cubic

In April 1999, a proposal to build a temporary two-mile conveyor belt to transport fill material for Sea-Tac Airport's planned third runway met strong resistance from Des Moines residents. The belt was intended to reduce heavy dump truck traffic on South King County roads, but neighbors opposed both the conveyor plan and the runway project itself, packing City Council meetings in protest. The third runway, requiring over 17 million cubic yards of fill, was scheduled for completion by 2005.