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

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Iowa Department of Natural Resources, 6 pp, 2017

The McGraw-Edison facility manufactured toasters and toaster ovens. An undetermined quantity of hazardous waste was left in the plating area and the wastewater treatment system when operations ceased in 1978. Soil contaminated with Cr, Ni, Cu, Zn, and Pb was removed during the 1989 Phase I and Phase II removal actions. TCE (up to 810,000 µg/L on-site and 370 µg/L off-site) and 1,2-DCE contaminate the groundwater. EPA is the site lead. The 1993 ROD required groundwater monitoring, on-site drainage controls, and groundwater pump and treat using filtration and UV oxidation. EPA issued a ROD amendment in July 1999 to change the preferred remedy for groundwater to an iron permeable reactive barrier (PRB) and natural attenuation. A dual-phase soil vapor extraction (SVE) system was operated from the early 2000s to 2010, when the TCE remedy appeared to be failing. Testing to determine SVE and PRB status was conducted in early 2011. In January 2015 a fire destroyed the former McGraw-Edison facility, including the SVE system. Successful small-scale testing of in situ soil stabilization and in situ chemical oxidation led to the development of a site-wide work plan for these remedies in 2015. In late 2017 EPA approved the injection (scheduled for 2018) of 137,250 gal of emulsified vegetable oil, 183 gal Nutrimens, 183 qt calcium polysulfide, 3,660 lb sodium bicarbonate, and 183 L of KB-1 at 83 injection points as part of a site-wide enhanced in situ biodegradation project to reduce the levels of TCE and daughter products. http://www.iowadnr.gov/portals/idnr/uploads/consites/rmcgraw.pdf

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