EPA Superfund site
SHIELDALLOY CORP.
Exposure status: insufficient data
Data limitations: Proximity to a Superfund site boundary does not mean your property is contaminated. EPA site boundaries show the area designated for cleanup, not the full extent of contamination. Groundwater plumes can extend beyond site boundaries. This tool shows publicly available EPA federal data. It is not affiliated with or endorsed by EPA, and is not a substitute for a professional environmental assessment.
About this site's exposure pathways
As of May 2026, the Shieldalloy Superfund site is considered “Insufficient Data to make a Human Exposure evaluation” (HEID). This status does not necessarily mean that unacceptable exposures are occurring. The site has three operable units (OUs): OU1 (non‑perchlorate groundwater), OU2 (non‑perchlorate soil, surface water, and sediment), and OU3 (perchlorate in all media). Remedies for OU1 and OU2 are complete. For OU1, a combination of in‑situ treatment and monitored natural attenuation was implemented and documented as complete in a remedial action report approved on December 8, 2020. For OU2, EPA capped about 1.3 acres of vanadium‑ and chromium‑impacted soils in the eastern storage areas, excavated approximately 9,800 cubic yards of Hudson Branch sediments, put institutional controls in place, and began surface water monitoring; this work was documented as complete in a remedial action report approved on September 23, 2020. For OU3, additional information is needed to determine whether actual or reasonably anticipated human exposures are occurring above acceptable risk‑based levels, particularly for perchlorate in groundwater.
Sufficient information has been collected for OU3 to complete the Remedial Investigation/Feasibility Study (RI/FS). The RI report and the Human Health Risk Assessment (HHRA) that considers potential exposure pathways such as drinking groundwater and direct contact with groundwater have been drafted and a draft FS report evaluating alternatives to cleanup the site is being prepared.
EPA currently anticipates there will be sufficient data to make a Human Exposure determination by December 2026 because the OU3 RI/FS and HHRA are expected to be completed and the Record of Decision (ROD) will be signed by that time, providing the information needed to determine whether human exposure is under control.
If you live or work near the site, you can reduce potential exposure by using municipal water where available or testing private wells before use, following any local advisories or institutional controls, and allowing access for sampling if requested. For more information, contact the EPA Community Involvement Coordinator Olivia Cappo via the site webpage or at (212) 637-3532 or [email protected]. EPA will continue to meet with residents and stakeholders, issue public notices and updated fact sheets, and keep the site profile on EPA’s website up to date.