U.S. EPA Contaminated Site Cleanup Information (CLU-IN)


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FINAL CLOSE-OUT REPORT, FRONTIER HARD CHROME SUPERFUND SITE, WAD53614988, CITY OF VANCOUVER, CLARK COUNTY, WASHINGTON
U.S. EPA Region 10, 81 pp, 2018

Chromium, the hazardous substance of primary concern at the FHC site, is present in two forms, Cr(III) and Cr(VI). Although the 1987 OU-1 ROD called for excavation, stabilization, and replacement of all soils with concentrations greater than 550 mg/kg total Cr (~7,400 yd3 of soil) and the OU 2 ROD called for groundwater pump and treat from the area of greatest contamination (levels of Cr >50,000 µg/L), testing demonstrated the remedy would be insufficiently effective; hence, the remedy selected in the 2001 ROD Amendment was implemented in 2003. Injections of a blend of sodium dithionite and ferrous sulfate were performed to create an in situ redox manipulation (ISRM) treatment zone for the Cr-contaminated groundwater, followed by similar injections in source and hot spot areas. These treatments were effective. EPA issued a Notice of Deletion of the Frontier Hard Chrome Inc. Superfund Site from the National Priorities List on August 6, 2018. https://semspub.epa.gov/src/document/10/100092362 Details of the ISRM field work are available in the 2003 remedial action report at https://semspub.epa.gov/work/10/500010197.pdf.



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