Ecology is entering into an Agreed Order with USG Interiors, LLC (USG) to clean up arsenic contamination at its former site in Puyallup, Washington (site).
Prior to 1971, the USG facility used slag from the former Tacoma Asarco copper smelter as a raw material to produce rock wool, a mineral fiber insulation. The manufacturing waste was used as fill on the site to raise the grade. In the 1980s, USG learned that the slag and waste contained high concentrations of arsenic, and had contaminated soil, sediments in the Puyallup River, and groundwater.
In 2006, USG conducted a site assessment and found soil and groundwater with arsenic concentrations above the state Model Toxics Control Act (MTCA) cleanup levels. In 2007, USG conducted a Remedial Investigation (RI) and Feasibility Study (FS). Now, Ecology and USG are proposing to implement the Cleanup Action Plan (CAP) to address the remaining contamination.
Ecology invites you to review and comment on the following documents:
You can also review and comment on the Public Participation Plan, which describes how Ecology will inform the community about site activities and opportunities to be involved in the cleanup process.
For more information, please visit Ecology's USG Interiors, LLC Puyallup website.
To review the Fact Sheet associated with the cleanup, click on the following link:
USG Interiors, LLC Puyallup Fact Sheet
Comment by mail
Washington Department of Ecology TCP - SWRO
Olympia, WA 98504
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