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-2 - <br />onsite discharged into shallow, gravel filled pits. TCE and <br />PCE have been identified in the shallow groundwater aquifer. <br />Hiah Exblosive (HE) Area: <br />HE compounds are used at LLNL-300 in weapons components that <br />are tested at the site. Two HE compounds are present in <br />soil and groundwater: cyclo-1,3,5-trimethylene-2,4,6- <br />trinitramine, commonly known as Research Development <br />Explosive (RDX); and cyclotetramethylene-tetranitramine, <br />commonly known as High Melting Point Explosive (HMX). <br />Pit 6• <br />Pit 6 is a closed former landfill that covers 2.4 acres in <br />area, about 15% of which actually received hazardous waste. <br />Pit 6 was in operation from 1964 to 1973, receiving waste <br />from LLNL-Main Site. TCE is the main contaminant identified <br />in groundwater. <br />Pit 7 Complex/East Firing Area/Building 850: <br />Between 1963 - 1978, LLNL conducted simulated open air <br />weapons detonations that involved the use of radioactive <br />substances. Tritium, depleted uranium, and beryllium were <br />used as explosive components at the firing tables, and were <br />part of the scattered debris. Until 1988 the debris was <br />deposited in Pit 7 complex (PITS 3, 4, 5 and 7), Tritium and <br />lead have been detected in the complex and in groundwater. <br />Building 833/Pits 8 and 9/Dry Wells/Miscellaneous Solid <br />Waste Management Units: <br />The Building 833 area was used to conduct testing on HE <br />products. Pits 8 and 9 are inactive landfills that once <br />received debris from testing. The dry wells were unlined <br />pits used for disposal of waste water. Groundwater and soil <br />has been contaminated with TCE, PCE, and 1, 2-DCE. <br />The environmental impacts of these activities are being <br />delineated during the Remedial Investigation/Feasibility Study <br />(RI/FS) at the LLNL-300 site. <br />The ARARs for this site may include environmental and public <br />health laws and regulations promulgated by your agency. We <br />request that your agency provide to the Department of Toxic <br />Substances Control a list of ARARs in reference to all <br />regulations and laws applicable to this site which are within <br />your jurisdiction. <br />