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r <br /> • Lawrence Liverm National Laboratory <br /> Li <br /> ,r <br /> RECEIVE,, <br /> DEC 2 7 1931 <br /> December 18, 1991 ENVIRONMENTAL HEAL"I"I'l <br /> FERMiT/SERVICES <br /> Mr. Doug Wilson <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. 0. Box 2009 <br /> Stockton, CA 95201 <br /> Subject: Fourth Quarter 1991 Status Report on LLNL Closure Activities for <br /> Underground Storage Tank 850-D1U1 (85041D) as Regulated <br /> under Title 23,California Code of Regulations,Section 2652 (d). <br /> Dear Mr. Wilson: <br /> This letter serves as the October through December 1991 Quarterly <br /> Status Report for underground storage tank (UST) closure activities at Site <br /> 300 which are managed by Lawrence Livermore National Laboratory's <br /> (LLNL) Environmental Restoration Division. LLNL's Operations and <br /> Regulatory Affairs Division manages several other UST projects and those <br /> reports are submitted separately. <br /> UST 850-DIU1 (850-41D) <br /> During the fourth quarter of 1991 we continued remedial action at the <br /> Building 850 tank excavation at Site 300. The tank excavation once <br /> contained a 1,500 gallon, diesel-fuel UST and is located on a steep hillside <br /> just south of Building 850. Piping from the tank terminates in a Christy <br /> Box near the building. Our remedial action addresses the approximately 20 <br /> gallons of diesel fuel that were released during the 1985 tank removal <br /> operation. A total of 67 soil and bedrock samples have been collected from <br /> the tank excavation and along the diesel fuel-piping. The samples have <br /> been analyzed for Total Extractable Petroleum Hydrocarbons as diesel <br /> (TEPH-diesel) using EPA Methods 3550/8015 and for BTEX(Benzene, <br /> Toluene, Ethylbenzene, and Xylenes) using EPA Methods 3550/8020. <br /> Quarterly sampling of nearby monitor well W-850-05 (Figure 1) has not <br /> detected any petroleum fuel hydrocarbons in ground water. <br /> An Equal Opportunity Employer•Universityof California•PO Box 808 Livermore,Califomia 94550•Telephone(415)422-1100•Twx 910-386-8339 UCLLL LVMR <br />