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CLOSURE PLAN FOR THE BUILDING 874 UNDERGROUND DIESEL FUEL SYSTEM <br /> AT LAWRENCE LIVERMORE NATIONAL LABORATORY'S SITE 300 <br /> BACKGROUND <br /> In August 1985, Lawrence Livermore National Laboratory (LLNL) <br /> contracted McKesson Environmental Engineers to perform a Precision Test on <br /> an out-of-use underground diesel fuel storage system at Site 300. Located <br /> at Building 874, the tank system was filled with diesel fuel for the test <br /> ' and evacuated following the test. The test, conducted using EZY-CHECK <br /> equipment, showed the tank to be product tight (+0.005 gal/hr) , but <br /> revealed a leak in the upper portion of the piping system. Figure 1 shows <br /> the location of the Bldg. 874 tank system at Site 300. <br /> The tank system (Figure 2) consists of a 5,000-gal carbon-steel tank <br /> and associated fill pipe, vent piping, and building supply and return <br /> piping. The system was registered with the State Water Resources Control <br /> Board in June 1984 as 874-11D. The Hazardous Substance Storage Statement, <br /> enclosed as Appendix A, provides additional information about the diesel <br /> fuel system. <br /> The tank system was last used in 1984. When it was taken out of use, <br /> the supply and return piping were disconnected from the building and <br /> ' capped, but were left in place and remained connected to the tank. In <br /> early 1988 an unrelated trenching operation adjacent to the tank <br /> - inadvertently hooked and severed a length of the piping that was still <br /> connected to the tank. There was no sign of leakage and the damaged <br /> piping was removed. The short length of pipe still connected to the tank <br /> was subsequently capped. <br /> To locate the site -of the leak indicated by the August 1985 Precision <br /> Test, Gary Peters Enterprises (Rancho Cordova, Calif.) performed a helium <br /> injection/detection test in April of 1988. The precise site of the leak <br /> ' in the upper portion of the piping system was not identified. However, <br /> the helium test revealed a small leak at the capped end of the pipe <br /> severed by the 1988 trenching activity. The following section describes <br /> 1 <br />