DPRA performed multi-media environmental compliance audits throughout the United States at approximately 200 mail processing and vehicle maintenance facilities over the past four years. The scope of the audits included reviews of activities subject to federal, state, and local environmental laws and regulations including requirements of the Clean Water Act, Clean Air Act, RCRA Subtitle C, RCRA Subtitle D, RCRA Subtitle I, TSCA, FIFRA, CERCLA, Endangered Species Act, and National Historic Preservation Act. State and local requirements also are covered as part of the compliance audit protocol. Each audit consists of an extensive site visit beginning with an entrance briefing where DPRA staff informs facility participants on the compliance review process. Following the entrance briefing, DPRA conducts a comprehensive tour of facility equipment, activities, and processes and a review of all related environmental compliance documents and records. DPRA also conducts formal and informal personnel interviews regarding compliance activities at the site. DPRA then develops written findings of noncompliance and a corrective action plan for obtaining compliance and for implementing additional pollution prevention measures. These are presented during on-site exit briefing where DPRA staff provide additional on-site training necessary to meet compliance standards. Following each audit, DPRA documents audit activities and facility operations in a formal report including a summary of findings, pollution prevention opportunities, and facility corrective actions. After the report is finalized, DPRA conducts follow-up site visits or site monitoring to evaluate implementation of the corrective action plan and provide additional on-site training as needed.