TagThird Runway(1067)

This document contains detailed chemical and environmental property data for Aroclor 1254, a polychlorinated biphenyl (PCB) mixture, including its molecular weight, water solubility, vapor pressure, and environmental fate characteristics. It covers sorption coefficients, half-lives in various environmental compartments (water, soil, sediment, biota), and bioconcentration factors in fish and other organisms. The data is compiled from numerous scientific studies published between the 1970s and late 1980s.

This 1991 report by Sheldon and Associates, prepared for the Washington Department of Ecology, assesses wetland mitigation replacement ratios in the Puget Sound region. It evaluates compensation sites where wetlands were restored or created to offset permitted wetland losses, examining how well those sites functioned as replacements. The report provides findings, conclusions, and recommendations on compensation plan design, monitoring, and appropriate replacement ratios for regulatory guidance.

A May 1989 environmental report from Hart Crowser, Inc. details the installation of three groundwater monitoring wells (WY-1, WY-2, WY-3) near underground fuel storage tanks at the Weyerhaeuser Aviation facility at Sea-Tac International Airport. Soil samples collected during drilling showed no detectable petroleum contamination, and no groundwater was encountered at the site. The report was prepared to help Weyerhaeuser comply with the Port of Seattle's NPDES permit requirements and to assess subsurface soil conditions around the tanks.

A flyer from the Seahurst Community Club urging residents to oppose a proposed expansion of Sea-Tac Airport, including the addition of a third runway, which was one of four alternatives being considered by the Puget Sound Council of Governments in 1988. The document warns of serious community impacts such as increased noise and air pollution, displacement of hundreds of families, falling home values, zoning changes, and the loss of 13 Highline School District facilities. Residents were directed to contact the Puget Sound Council of Governments, Port of Seattle Commissioners, and King County Councilmembers before the Final Environmental Impact Statement was issued on March 17, 1988.

This document describes input data formats for the VS2D computer program, developed by the U.S. Geological Survey, which simulates fluid flow in variably saturated porous media. It details technical parameters for evaporation and evapotranspiration modeling, including variables for potential evaporation rates, rooting depth, root activity, and atmospheric pressure. The document also outlines time-step control settings used to manage the numerical simulation of subsurface water movement.

This 1980 soil science paper by M.Th. van Genuchten presents a closed-form mathematical equation for predicting how well water moves through unsaturated (partially dry) soils. The equation relates soil-water retention to hydraulic conductivity using a small set of measurable parameters, offering a simpler and more computationally reliable alternative to earlier methods. The model was validated against observed data for several soils with widely varying properties.

This 1978 Project Manual outlines the specifications for a Noise Monitoring System at Seattle-Tacoma International Airport, issued by the Port of Seattle Commission. The document covers bidding requirements, contract conditions, and detailed technical specifications for installing remote monitoring stations, communications channels, and a central processing system to track aircraft noise levels around the airport. It was prepared under the direction of Chief Engineer Vernon L. Ljungren and includes provisions for system warranty and ongoing maintenance services.