EPA Superfund Site

OPERATING INDUSTRIES, INC., LANDFILL

CA | EPA ID CAT080012024

About this site’s exposure pathways: As of September 2023, the Operating Industries, Inc., Landfill Superfund site is considered “Insufficient Data to make a Human Exposure evaluation” (HEID) because results of the most recent VI investigation indicated the possibility of subsurface gas migration near the former Costco building in the Northeast Area. The site was previously categorized as HEUC. The primary chemicals of concern that may present a vapor intrusion risk is vinyl chloride. Vapor intrusion concerns were initially identified in the most recent Five-Year Review. The potential responsible party (PRP) has prepared a draft Vapor Intrusion Investigation Report based on existing data and EPA has submitted comments.

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. The planned activities to collect sufficient information to evaluate this new exposure pathway and/or contaminants(s) include submittal of a final draft of the Vapor Intrusion Investigation Report by the PRP in early 2024. The data and analysis presented in this report will determine whether a complete human exposure pathway exists.

EPA currently anticipates that there will be sufficient data to make a Human Exposure evaluation by 4/01/2024 because the vapor intrusion investigation results and evaluation should be completed at that time.