Operation of an underground storage tank refurbishment facility resulted in groundwater and soil contamination. The primary contaminants are tetrachloroethylene, also known as perchloroethylene (PCE), and trichloroethylene (TCE). Contaminated groundwater extends approximately one mile south of the site and has impacted residential water wells. Since groundwater should not be used for drinking purposes, as many as 100 properties with contaminated wells were connected to the public water system. Thermal treatment was applied to onsite PCE-contaminated soils, which were the source of the onsite and offsite groundwater contamination. Onsite and offsite monitoring wells and residential wells are regularly sampled. As part of site investigation activities, a Human Health Risk Assessment (

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