TagMTCA(16)

A periodic review by the Washington State Department of Ecology’s Toxics Cleanup Program of post-cleanup site conditions at the Continental Airlines Hydrant Fuel System located at SeaTac International Airport, Concourse C and North Satellite. The review evaluates whether cleanup actions conducted under the Model Toxics Control Act (MTCA) are protecting human health and the environment,

The Port of Seattle filed a petition in August 2002 asking the Pollution Control Hearings Board to reconsider Condition 8 of its Final Order, which prohibited the use of a soil-testing method called SPLP (Synthetic Precipitation Leaching Procedure) to approve fill material for the Third Runway expansion project at Sea-Tac Airport. The Port argued that banning SPLP made it nearly impossible to find acceptable fill soil, since up to 78% of naturally occurring, uncontaminated soils would fail the Board's strict numeric criteria when tested across multiple constituents. The Port maintained that proper use of SPLP poses no environmental threat to water quality and requested the Board allow its use under specific conditions so the runway project could proceed.

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.