SITE INFORMATION AND CORRESPONDENCE

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• • Groundwater and Soil: Groundwater occurs Closure History at about 400 ft. beneath the capped High Explosive Open Burn Treatment Facility. Remedial Investigation of the High This aquifer is connected to the drinking Explosive Open Burn Treatment Facility water supply resource and is not started in 1986. The results and contaminated. There is also a perched recommendations were presented to DTSC groundwater at the depth of about 90 feet, in 1989. It was recommended then to close and approximately 70 feet east from the the site with a cap and to construct a new capped edge. This perched water body is High Explosive Treatment Facility. DTSC contaminated with volatile organic issued a permit for a new Explosive Waste compounds. Soil under the capped area is Treatment Facility (EWTF) and approved contaminated with high explosive materials, a closure plan for the High Explosive Open metals, and volatile organic compounds at Burn Treatment Facility in 1997. The shallow depths as a result of past operations. construction of the cap of this Facility was Assessment of contamination at the site was completed, certified, and accepted by DTSC conducted in late 80s. DTSC is the lead on July 7, 1999. DTSC will issue a Post- agency overseeing site-wide soil and Closure Permit with a requirement of groundwater cleanup. installing an additional monitoring well in close proximity of the cap. Hazardous Waste Permit History Project Description The Site 300 facility began operations in The project consists of groundwater 1955. The former High Explosive Open monitoring and regular inspection for the Burn pits, which operated from 1955 to landfill cap in compliance with post-closure 1997, were closed by DTSC in 1999. This requirements. Monitoring and inspection Facility was covered with a composite liner would be required for at least 30 years, and cap to prevent intrusion of water. There is longer if determined by DTSC. no liner underlying this closed Open Burn Treatment Facility. A groundwater Compliance History monitoring system is required to ensure that the Contaminants of Concern (COCs) The facility is inspected annually by DTSC. within the landfill will not impact the quality The last inspection was completed in August of groundwater in the deep-seated acquifer. 2001. No violations were discovered. No Notice of Violation has been issued by Lawrence Livermore National Lab. - Site DTSC since 1999. 300 applied for a Post-Closure Permit on September 14, 2000. The Post-Closure California Environmental Permit would allow the facility to continue to monitor groundwater in the vicinity of the Quality Act (CEQA) former open burn pits and to conduct routine inspections of the cover. Prior to reaching a decision on this project, DTSC, as the Lead Agency under the provisions of the California Environmental Page 3