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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 /> High Explosive (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 />