EPA Superfund Site

DELFASCO FORGE

TX | EPA ID TXD988034328

About this site’s exposure pathways: As of August 2025, the Delfasco Superfund site is considered “Current Human Exposure Not Under Control” (HENC). There is known human exposure to residences overlying the shallow groundwater plume near the source area via the Vapor Intrusion pathway. This exposure pathway is considered unacceptable based on EPA risk-based criteria because known residential properties with elevated levels of TCE have not given access to EPA to install a vapor intrusion mitigation systems (VIMS) resulting in unsecured exposure pathways to human receptors, and concentrations of COCs above risk-based levels. Collecting sufficient data to determine potential vapor intrusion impacts at residential properties and to test the effectiveness of the installed VIMS, has been limited due to lack of access by the community.
Currently, the planned activities to address this pathway are robust community involvement activities that include door-to-door notifications, the dissemination of informative fact sheets at residential properties, at local religious institution, on the City of Grand Prairie webpage, and a planned community meeting for January 2026. These activities will potentially result in EPA receiving additional access to residential properties to conduct vapor intrusion sampling and/or installing a VIMS to break the pathway and reduce COC concentrations in the indoor air. An interim remedy is also planned for FY26 to install a soil vapor extraction (SVE) system at the source to reduce and contain further leaching of COCs in soil into the underlaying groundwater, and to install an in-situ barrier that will intercept the groundwater plume as it migrates to reduce and contain the plume before impacting unprotected residential properties. EPA anticipates this Site will be considered “Human Exposure Under Control” by October 2027.
In addition, EPA is still offering vapor mitigation systems to residential properties, with chemicals of concern (COCs) concentrations above the acceptable risk-level, at no cost to them.