The purpose of this Compendium of Unimplemented Recommendations is to highlight for U.S. Environmental Protection Agency (EPA) management significant recommendations that remain unimplemented past the due date agreed to by EPA and the Office of Inspector General (OIG). The Compendium satisfies part of Section 5(a) of the Inspector General Act of 1978, as amended, which requires each Inspector General to issue semiannual reports to Congress and include "an identification of each significant recommendation described in previous semiannual reports on which corrective action has not been completed." This Compendium is being issued in conjunction with the OIG Semiannual Report to Congress for the reporting period October 1, 2009, through March 31, 2010. The OIG intends to issue this Compendium each semiannual reporting period. The Compendium will keep Agency management informed about EPA's outstanding commitments and its progress in taking agreed-upon corrective actions on OIG recommendations to improve programs and operations.