EPA Superfund Site

INDUSTRIAL WASTE PROCESSING

CA | EPA ID CAD980736284

About this site’s exposure pathways: As of October 2023, the Industrial Waste Processing Superfund site is considered “Insufficient Data to make a Human Exposure evaluation” (HEID) because of a newly identified exposure pathway and/or contaminant(s) were identified in the 2019 Five-Year Review. Solvent concentrations (trichloroethene [TCE] and tetrachloroethene [PCE]) were detected at elevated concentrations in indoor air samples onsite. EPA identified possible sources from the subsurface gas to the indoor air and worked with the existing owner to implement mitigation. Part of this strategy included a Time Critical Removal Action to install a Sub-Slab Depressurization System in July 2021. The building on-site is protected by the Sub-Slab Depressurization System. However, a sitewide investigation will need to be performed to locate the source of the contamination, evaluate the exposure pathway to the building on-site, and also evaluate potential exposure pathways off-site to nearby residences. The site was previously categorized as "Human Exposures Not Controlled" (HENC), because an indoor air mitigation measure was previously not in-place.

EPA uses this Human Exposure status when there is a lack of evidence to suggest that actual or reasonably anticipated human exposures are occurring and that those exposures are above acceptable risk-based levels. Although there is no evidence that concentrations of chemicals of concern are above the acceptable risk-based levels, EPA installed the Sub-Slab Depressurization System as a precautionary measure. EPA currently anticipates that there will be sufficient data to make a Human Exposure evaluation by 12/31/2024 because a Remedial Investigation will be performed by then.