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Lawrence Livermore National Laboratory <br /> '. 3 I Fri 2: 19 <br /> March 25, 1994 <br /> Mr. Doug Wilson <br /> Public Health Services of San Joaquin County <br /> Environmental Health Division <br /> P. O. Box 2009 <br /> Stockton, Ca 95201 <br /> Subject: Underground Storage Tank Unauthorized (Leak)/ <br /> Contamination Site Report, and Report of a Failed Pressure Test of <br /> Underground Piping,Tank 836-D1U1 at Building 836 <br /> Attached is an Underground Storage Tank Unauthorized Release (Leak)/ <br /> Contamination Site Report for tank system 836-D1U1 at Lawrence Livermore <br /> National Laboratory Site 300. <br /> Underground storage tank 836-D1U1 at Building 836 was a 280 gallon single-wall <br /> carbon steel tank that supplied diesel fuel to the Building 836 standby generator. <br /> On March 11, 1994, the tank system was closed and the tank was removed from the <br /> ground. Soil samples collected from within the excavation and from the soil <br /> removed from the excavation were submitted for analyses of diesel fuel (TPH-D) <br /> and BTXE. On Friday, March 18, we received the results of analyses of these <br /> samples. The sample collected within the excavation at a depth of 82 inches below <br /> the surface showed 69 mg/kg for TPH-D, and 'ND" (not detected) for all four BTEX <br /> analytes. The sample collected from pile of excavated soil and fill showed 1400 <br /> mg/kg TPH-D. BTEX analyses showed 'ND" for Benzene, 0.0062 mg/kg for <br /> Toluene, 0.13 mg/kg for Xylene, 0.015 mg/kg for Ethylbenzene. <br /> The Closure Plan for 836-D1U1 specified that soil samples would be collected below <br /> the underground piping as well as from below the underground tank. On March 11 <br /> the job-site was not ready for collection of soil samples below the piping. Mr. <br /> Snavely stated that the closure would not be complete until 1.) samples were <br /> collected as prescribed by the Closure Plan and were shown by analyses to be clean <br /> (enough), or 2.) a pressure test was performed on the piping that showed that <br /> piping to be leak tight. <br /> An Equal Opportunity Employer•University of California•P.O.Box 808 Livermore,CA 94551-9900•Telephone(510)422-1100 •Twx 910-386-8339 UCLLL L VMR <br />