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Introduction On June 24, 2010, representatives of the U.S. Environmental Protection Agency (EPA) accompanied by a representative of California's Certified Unified Program Agency (CUPA) conducted an unannounced compliance evaluation inspection (CEI) of Lawrence Livermore National Laboratory, Site 300 ("Site 300"). The purpose of the inspection was to determine Site 300's compliance with applicable federal environmental statutes and regulations, and in particular, the Resource Conservation and Recovery Act (RCRA), as amended, the regulations provided in the Code of Federal Regulations (CFR), Chapter 40, Parts 261-265, 268, 273, and 279, and the California Code Regulations (CCR), Title 22, Division 4.5 and the California Health and Safety Code, Division 20. The inspectors conducted a physical inspection of the facility and reviewed records. This inspection report summarizes the events that transpired during the inspection, including observations and findings made by the inspectors. Facility Background Site 300 is an experimental test site operated by the Lawrence Livermore National Security, LLC, for the Department of Energy's National Nuclear Security Administration. It is situated on 7,000 acres in the rural foothills of Alameda and San Joaquin counties. Site 300 was established in 1955 as a non-nuclear explosives test facility to support Livermore Laboratory's national security mission. Operations at Site 300 supports the Laboratory's nuclear weapons program by assessing the operation of non-nuclear weapon components using hydrodynamic testing and advanced diagnostics, such as high-speed optics and X-ray radiography. The facility's operations include chemical formulation of explosives, machining explosive charges, and assembling machined charges prior to being sent to the on-site test firing facilities. Hazardous waste generated from these activities is sent to the on-site waste management center for treatment, packaging, storage, and eventual shipment to an off-site disposal facility. In 1996, California's Department of Toxic Substances Control (DTSC) issued a Hazardous Waste Facility Permit (HWFP) for the operations of two areas within the facility, the Explosive Waste Storage Facility (EWSF) and the Container Storage Area (CSA). In 1997, DTSC, issued a second HWFP for the operation of a third area, the Explosives Waste Treatment Facility (EWTF). In 2005, Site 300 submitted a consolidated permit renewal application for the CSA, EWSF, and EWTF areas. The permit allows Site 300 to store hazardous waste for up to one year. The consolidated permit is currently being reviewed at DTSC. As part of the permit renewal process an ecological risk assessment is being conducted.