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SR 510 Yelm Loop Phase 2 Improvement Project: Supplemental Environmental Assessment and Online Public Meeting – Hazardous materials

The federal and state contaminated site databases (EPA and Ecology) were consulted to identify potentially contaminated sites in the one-mile study area. No EPA Superfund sites were identified in the study area, and 59 potentially hazardous waste sites were identified in Ecology records and/or in the 1999 Hazardous Waste Corridor Site Assessment report. Most of the sites in the immediate vicinity of the Build Alternative footprint were identified as low-risk; two sites were identified as moderate-risk due to the potential for contamination of soils and/or groundwater. Portions of the study area fall within the Tacoma Smelter Plume, increasing the potential for encountering arsenic and lead contamination in surface soil.

For more information

To read more about the study approach, existing conditions, and effects on hazardous materials, please see Section 3.8 Hazardous Materials (PDF 464KB).