TagMTCA(83)

This 2001 User's Guide from the Washington State Department of Ecology explains how to use spreadsheet workbook tools (MTCASGL and MTCATPH) to calculate soil and groundwater cleanup levels under the Model Toxics Control Act. The guide covers how to enter site-specific data—such as chemical properties, exposure parameters, and hydrogeological characteristics—to determine safe contamination thresholds. It is intended for environmental cleanup professionals working on hazardous substance remediation in Washington State.

This document is an email chain from June-July 2001 between Washington State Department of Ecology staff discussing acceptable fill material criteria for the Seattle-Tacoma International Airport Third Runway project. Officials debated whether to restrict fill to naturally occurring uncontaminated soils or to allow other materials subject to contamination testing standards, with recommendations including requiring the top six feet of fill to be clean natural soil and using Table 749-3 screening values to protect plants and animals. The discussion also addressed whether the state's Model Toxics Control Act (MTCA) standards should apply, including requirements for contaminant testing, groundwater monitoring, and terrestrial ecological evaluation.

Internal email chain dated June 27, 2001 from Peter Kmet (Ecology HQ/TCP) to Kevin Fitzpatrick, cc Chung K. Yee, marked ‘Deliberative Document Currently Exempt From Public Disclosure.’ Kmet recommends language for fill material criteria in the Draft 401 Certification for the Seattle-Tacoma International Airport Third Runway project, including: requiring the uppermost 6 feet of fill

Internal email chain dated June 27, 2001 among Peter Kmet, Kevin Fitzpatrick, Chung K. Yee, and others at Washington State Department of Ecology regarding acceptable fill criteria language for the Draft 401 Certification for the Seattle-Tacoma International Airport Third Runway Master Plan improvements. Kmet recommends against restricting fill to naturally occurring uncontaminated soils and proposes

This 2001 email chain among Washington State Department of Ecology staff discusses recommended criteria for fill material to be used in the Seattle-Tacoma International Airport Third Runway project. Staff member Peter Kmet proposed requiring fill material to meet ecological screening values from Table 749-3, with the uppermost six feet consisting of clean, naturally occurring soil free of manmade organic compounds and metals above natural background levels. The discussion also covers the applicability of the Model Toxics Control Act (MTCA) standards and the need to address potential impacts on plants, animals, groundwater, and aquatic organisms.

Email dated June 26, 2001 from Chung K. Yee to Craig E. Thompson and Kevin Fitzpatrick (Ecology) transmitting draft fill criteria requirements for the 401 Water Quality Certification for the SeaTac Third Runway Embankment project. Attachments include: draft clean fill criteria, spreadsheets deriving surface water quality criteria and ground water cleanup levels using three-phase model

Memo dated June 22, 2001 from Ching-Pi Wang (Toxics Cleanup Program, TCP) to Ann Kenny regarding TCP recommendations for 401 certification related to the proposed Third Runway at Seattle-Tacoma International Airport (STIA). Three recommendations: (1) Port of Seattle to develop a plan by September 14, 2001 to monitor contaminant transport to soil and groundwater via

Memorandum from Ching-Pi Wang to Ann Kenny (cc: Ray Hellwig, Roger Nye, John Wietfeld, Steve Alexander) dated June 22, 2001, outlining Toxics Cleanup Program (TCP) recommendations for 401 certification related to the Port Of Seattle Third Runway project. Three recommendations: (1) Port Of Seattle to develop a plan by September 14, 2001 to monitor contaminant

Draft technical memorandum prepared by Associated Earth Sciences, Inc. (AESI, Project No. BV99122C) for Port Of Seattle, dated June 19, 2001, analyzing preferential ground water flow paths relative to the proposed Third Runway at Seattle-Tacoma International Airport (STIA). Responds to Washington Department of Ecology (Ecology) request regarding whether contaminated ground water below the Aviation Operations

Email chain (AR017302) among Washington State Department of Ecology staff Chung K. Yee, Kevin Fitzpatrick, Craig Thompson, and AAG Joan Marchioro regarding acceptable fill criteria language for the Draft 401 Water Quality Certification for the Seattle-Tacoma International Airport Third Runway project. Key issues include: whether Ecology’s 401 WQ Certification fill criteria should ‘stand alone’ from