Tagsoil(64)

This Washington State University Extension bulletin explains how lead and arsenic can contaminate home garden soils through historical sources such as lead-based paint, leaded gasoline, and arsenical pesticides, and why this poses health risks especially for children. It provides guidance on identifying contaminated soils through chemical testing and offers practical steps gardeners can take to reduce their exposure to these toxic elements.

Hart Crowser subsurface conditions data report (project J-4978.02) prepared for HNTB and Port Of Seattle, dated September 24, 1999, covering Borrow Areas 1, 3, and 4 for the Sea-Tac Airport Third Runway project. Report includes generalized geologic conditions, subsurface soil conditions, hydrogeologic regime, groundwater elevation data, and perched water-bearing zone analysis. Field explorations used dual-wall

A 1999 internal Port of Seattle memorandum reviews soil quality data for the Hamm Creek Restoration Project site near Boeing Field, evaluating whether the material is safe to use as fill for a proposed third runway. The review found that detected contaminants — including PCBs, DDTs, mercury, and PAHs — fell below MTCA cleanup levels, leading to the conclusion that the material is suitable for upland fill use. While the soil did not meet PSDDA standards for open-water disposal, the memo notes that this distinction is not technically relevant given its intended use as runway fill.

Memorandum dated August 13, 1998 from Jamie Beaver and Allen Jones at Hart Crowser, Inc. to Michael Bailey (Hart Crowser), CC Pete Douglass (Peter M. Douglass, Inc.), project J-4978-01. Presents soil strength parameters for Phase II embankment stability analysis using UTEXAS3 program. Covers SPT N-value correlations for shear strength, friction angle (cohesionless soils including sands

A 1997 Agreed Order issued by the Washington State Department of Ecology directed the Port of Seattle to address hazardous substance contamination at Seattle-Tacoma International Airport. Jet fuel, gasoline, industrial solvents, and other chemicals had been released across twelve separate sites within a half-square-mile Aircraft Operations and Maintenance Area, impacting both soil and groundwater. The order established a framework for ongoing environmental investigation and cleanup while acknowledging the operational challenges of working in an active airport environment.

EPA Soil Screening Guidance: User’s Guide, Second Edition (Publication 9355.4-23, EPA/540/R-96/018), published July 1996 by the U.S. Environmental Protection Agency Office of Emergency and Remedial Response (OERR), Office of Solid Waste and Emergency Response. This Superfund guidance document provides soil screening levels (SSLs) and methodologies for evaluating contaminated soil at Superfund sites, including statistical approaches

EPA Superfund publication 9355.4-23 (April 1996), ‘Soil Screening Guidance: User’s Guide,’ issued by the United States Environmental Protection Agency Office of Solid Waste and Emergency Response, Washington DC 20460. Exhibit AR033734. Includes Table C-4 presenting metal Kd values (L/kg) as a function of pH for metals including arsenic (Ag), barium (Ba), beryllium (Be), cadmium (Cd),

Washington State Department of Ecology publication #94-145 (updated 1/96) presenting the February 1996 annual update to the MTCA (Model Toxics Control Act) Cleanup Standards under CLARC II. Covers Method B and Method C cleanup levels for soil and groundwater, reference doses (RfD), cancer potency factors, hazard quotients, WAC 173-340-740 and WAC 173-340-745 calculations, inhalation correction

This 1995 Washington State Department of Ecology document provides guidance for cleaning up soils contaminated by petroleum products. It outlines remediation standards and procedures under the state's Toxics Cleanup Program, applicable across all regions of Washington State. Note: This document addresses soil contamination cleanup and does not contain content specifically related to Sea-Tac Airport noise policy.

Washington State Department of Ecology (Ecology) Publication #94-115 reporting natural background concentrations of metals in surficial soils throughout Washington State, based on a seven-year study co-sponsored by USGS Water Resources Division (Tacoma Office). Study divided Washington into 24 regions, selected 12 for statewide assessment, collected 490 soil samples from 166 locations including Puget Sound, Clark