The US Environmental Protection Agency (EPA) Region 6 had originally requested a review of the performance of the ground water remedy at the Homestake Superfund site. The site was used for milling of uranium ore and includes two tailings piles. The operations and leaching of liquids from the mill site and tailings piles has contaminated ground water in the vicinity of the site. The RSE report described the site conditions and the current remedy, as well as provided several recommendations. Based on stakeholder comments, EPA determined that there were additional issues that needed to be addressed regarding the implemented remedy at the site. Through Headquarters, US EPA, the US Army Corps of Engineers (USACE) Environmental and Munitions Center of Expertise (EM CX) was tasked to perform a follow-on study (the RSE "Addendum") to address a number of remaining issues.

• Focused Review of Specific Remediation Issues: An Addendum to the Remediation System Evaluation for the Homestake Mining Company (Grants) Superfund Site, New Mexico, Region 6 (PDF)(428 pp, 19 MB, 2011, 542-R-11-002)