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' INTRODUCTION ' Lawrence Livermore National Laboratory (LLNL) operates the Site 300 test facility in support of its national defense program. Site 300, located in the eastern ' Altamont Hills about 15 miles southeast of LLNL, is used for materials testing and high- explosives diagnostic work. Site 300 covers approximately 11 square miles in a sparsely populated region. The site is characterized by steep hills with rugged canyons; local ' relief is on the order of 290 to 570 feet. The climate at Site 300 is arid; average rainfall is about 10 inches per year. No perennial streams exist within or near Site 300. In 1982, LLNL began an initial assessment of the environmental effects of ' trichloroethylene (TCE) discharge in several areas of Site 300. By 1983, five locations within the site were found to have TCE in soil, rock, and/or ground water. Investigations of TCE contamination have continued, with emphasis placed on the Building 834 Complex, Building 815, and the General Services Area (GSA), all in the southeast part of the site. ' Rinse-water discharges from buildings within the High Explosives (HE) Process Area have historically been disposed of in unlined lagoons adjacent to the processing buildings. Use of these lagoons was terminated in 1985. Because of the California Regional Water Quality Control Board's (CRWQCB) concerns about the potential for ' ground water degradation as a result of the presence of HE compounds in soil and rocks beneath the lagoons, LLNL conducted field investigations within the HE Process Area in 1986 and 1987. Those investigations are continuing, and the HE lagoons will be formally ' closed by November 1988. Debris from high explosives tests is disposed of in landfills at the northern end of Site 300. In 1981, the Hazardous Waste Assessment study of the hydrology, geology, and 1 ground water chemistry associated with Site 300 landfills was initiated. As part of this project, monitoring wells were installed at all of the landfills, and a program of periodic ground water analysis was initiated. In 1984, tritium levels in four of the wells rose ' above the State drinking water standard (20,000 pci/1). A program of investigation was then begun, and to date, three areas of tritium in ground water have been discovered: Pit 7 Complex, East Firing Area (EFA), and Building 850 area. ' Recent monitoring has revealed the presence of trace amounts of TCE in ground water near the Pit 7 Complex and at Pit 8. Monitoring is continuing at these locations. ' This document is a work plan which details the activities to be conducted at Site 300 during FY 88 by the LLNL Investigations and Corrections Section of the Environmental Protection Department. These investigations are a continuation of an ' ongoing program to identify areas of soil, rock, and ground water contamination, and to remediate those areas to bring Site 300 into compliance with federal, state, and local laws and regulations. This work plan identifies tasks to be performed during FY 88 ' through FY 90. Detailed work to be accomplished is presented for FY 88 only. Work plans for FY 89 and FY 90 will be prepared at the beginning of each of those years. A schedule of activities is included as Table 1 and a map showing locations of ' areas and facilities studied at LLNL Site 300 is presented as Figure 1. ' -1-