TagACC(1534)

This technical document describes the background water chemistry and modeling assumptions used to estimate how metals move through soil and groundwater at contaminated sites. It outlines key simplifications in the MINTEQ geochemical model, including the assumption of chemical equilibrium and the exclusion of redox potential, and presents soil-sorption values (Kd) for various metals such as arsenic, chromium, and cadmium that vary with soil pH. The results show that metal mobility is most strongly influenced by pH levels in the subsurface environment.

This document presents three-phase back calculations for soil contamination levels at a site, listing various chemical constituents including heavy metals (arsenic, cadmium, chromium, lead, mercury, zinc) and petroleum products (TPH, gasoline, heavy oils). The table compares cleanup criteria from multiple regulatory frameworks including ambient water quality criteria (AWQC), drinking water standards, Model Toxics Control Act (MTCA) methods, and Fish and Wildlife Service ecological screening levels. The calculations were used to evaluate soil remediation thresholds based on leaching potential and ecological risk, with source references including EPA and MTCA SSL tables dated August 2001.

Pre-filed testimony of Sally Nelson, Burien City Council member and former Mayor, submitted on behalf of appellant Airport Communities Coalition (ACC) in PCHB No. 01-160, ACC & CASE v. Dept. of Ecology & Port Of Seattle. Testimony introduces ACC — an interlocal agreement entity comprising Cities of Burien, Des Moines, Federal Way, Normandy Park, Tukwila,

Declaration of Gina Marie Lindsey, Director of Seattle-Tacoma International Airport (STIA) since September 1993, submitted in Pollution Control Hearings Board (PCHB) Case No. 01-0133, Airport Communities Coalition v. Department of Ecology and Port of Seattle. Lindsey describes STIA deficiencies including airside delays during poor weather, inadequate parking, inadequate road access for south airport traffic, and

Declaration of Joseph Brascher of Aqua Terra Consultants in PCHB case 01-133, Airport Communities Coalition (ACC) v. Department of Ecology and Port Of Seattle. Brascher describes his expertise in surface and groundwater modeling using HSPF, SWMM, MODFLOW, and other hydrologic software packages. Aqua Terra acted as subconsultant to Parametrix, Inc. for the Low Flow Analysis

Declaration of Kevin L. Stock, attorney for Airport Communities Coalition (ACC), filed October 4, 2002, in King County Superior Court case No. 02-2-25658-9 SEA, Port of Seattle v. Pollution Control Hearings Board (PCHB), ACC, and Citizens Against SeaTac Expansion (CASE). Lists Exhibits A–L attached to the declaration, including seven letters from Dr. Stephen Hockaday to

Notice of Appearance filed by attorney John E. Woodring (WSBA# 6781) on behalf of petitioner Airport Communities Coalition (ACC) in Thurston County Superior Court case No. 02-2-01595-3, State of Washington Department of Ecology v. Pollution Control Hearings Board, Airport Communities Coalition, Citizens Against Sea-Tac Expansion (CASE), and Port Of Seattle. Served on multiple parties including

This 2002 staff report from the City of SeaTac and City of Des Moines addresses an appeal by King County Water District #54 challenging an environmental (SEPA) determination related to the Des Moines Creek Basin Restoration Projects, a multi-agency effort to reduce stormwater damage and protect water quality near the Tyee Golf Course. The water district argued that the environmental review failed to adequately address potential impacts to the Highline aquifer, which serves as its sole water supply source. The hearing was scheduled before a Hearing Examiner on October 10, 2002.

Port Of Seattle Notice of Appearance filed September 19, 2002 in Superior Court of Washington for Thurston County, Case No. 02-2-01595-3, State of Washington Department of Ecology v. Pollution Control Hearings Board, Airport Communities Coalition, and Citizens Against Sea-Tac Expansion. Signed by Linda J. Strout (WSBA #9422) and Traci M. Goodwin (WSBA #14974). Accompanied by