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S LAWRENCE LIVERMORE NATIONAL LABORATORY -SITE 300 Hazardous Waste Facility EPA ID No. CA 2890090002 Post -Closure Permit Effective Date: April 3, 2003 Page 2 of 13 PART II. DESCRIPTION OF THE FACILITY AND OWNERSHIP OWNER The owner of the facility is the United States Department of Energy (hereafter "owner"). 2. OPERATOR The operator of the entire Lawrence Livermore Experimental Test Site 300 facility is the University of California, Lawrence Livermore National Laboratory (hereafter "Operator"), for the U.S. Department of Energy (Owner). The Operator will implement the requirements for maintenance and groundwater monitoring for the covered Building 829 High Explosives Open Burn Treatment Facility (HE Open Burn Facility). 3. LOCATION The Lawrence Livermore National Laboratory's Experimental Test Site 300 is located about 15 miles east of Livermore, California and 65 miles southeast of San Francisco in the Altamont Hills of the Diablo Range. About one-sixth of Site 300 lies in Alameda County, and the remainder is situated in San Joaquin County. Site 300 covers an area of approximately 11 square miles north of Corral Hollow Road. 4. DESCRIPTION The covered HE Open Burn Treatment Facility is located in the south central portion of Site 300. The HE Open Burn Treatment Facility is a part of the Building 829 Complex. It was constructed in 1955 and consists of three unlined pits and an open air burn unit. Explosives and waste contaminated with explosives were treated at the HES Open Burn Treatment Facility. The four principal explosives compounds that were treated at the Facility were HMX (cyclotetramethylene tetra nitramine), RDX (cyclotrimethylene trinitramine), TATB (triamino-trinitrobenzene), and TNT (2,4,6 -trinitrotoluene). The closure cover, approximately one-half acre, was constructed in accordance with a DTSC approved Closure Plan between June 29, 1998 and August 7, 1998. The components of the closure cover consisted of backfilling of existing pits with two feet of compacted general fill, a geosynthetic clay liner, a 60 -mil textured geomembrane, a double sided geocomposite drainage layer, a two -foot topsoil layer from the designated borrow areas, a hydroseeded cover, and a perimeter drainage system. The covered area will not be used for any other purposes. No post -closure land use is anticipated.