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■ Lawrence Livermore National Laboratory <br /> APR 0110, <br /> A PR if, 5 f <br /> HL'_AI_T-H <br /> Mr. Doug Wilson PEPNIII/SERVICES <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 2009 <br /> Stockton, CA 95201 <br /> Subject: Fourth Quarter 1992 and First Quarter 1993 Status Report on <br /> LLNIL Closure Activities for Underground Storage Tank <br /> 850-DlU1 (850-41D) as Regulated under Title 23,California Code <br /> of Regulations,Section 2652 (d). <br /> Dear Mr. Wilson: <br /> This letter serves as the October 1992 to March 1993 status report for <br /> underground storage tank (UST) closure activities at Site 300 which are <br /> managed by Lawrence Livermore National Laboratory's (LLNL) <br /> Environmental Restoration Division. LLNL's Operations and Regulatory <br /> Affairs Division manages several other UST projects and reports of those <br /> projects are submitted separately. <br /> UST 850-DlUl (850-41D) <br /> We are finalizing a closure report for remedial action performed at the <br /> Building 850 tank excavation at Site 300. The report, titled Closure Report <br /> for the 850-DI UI Underground Storage Tank at Lawrence Livermore <br /> National Laboratory Site 300 will be submitted to you in April of 1993. The <br /> tank excavation once contained a 1,500 gallon, diesel-fuel UST and is <br /> located on a-<teep hillside just south of Building 850. The product lines are <br /> still in place between the former diesel tank and a Christy Box near the <br /> building. Our remedial action addressed the approximately 20 gallons of <br /> diesel fuel that were released during the 1985 tank removal operation. A <br /> total of 57 soil and bedrock samples were collected from the tank excavation <br /> and a total of 10 soil and bedrock samples were collected and analyzed from <br /> two boreholes adjacent to the diesel fuel-piping. The samples were <br /> analyzed for Total Extractable Petroleum Hydrocarbons as diesel (TEPH- <br /> diesel) using EPA Methods 3550/8015 and for BTEX (benzene, toluene, <br /> ethylbenzene, and xylenes) using EPA Methods 3550/8020. Quarterly <br /> sampling of nearby, downgradient monitor well W-850-05 has not detected <br /> any petroleum fuel hydrocarbons in ground water. <br /> Approximately 115 yd3of soil with TEPH-diesel concentrations in excess <br /> of 100 mg/kg (ppm) were excavated from the tank excavation area. The <br /> excavated soil has been wrapped in 10-mil polyethylene sheeting and <br /> stockpiled at the Building 850 lower corp yard. Because of budget <br /> An Equal Opportunity Employer•Universityof California•P 0 Box 808 Livermore,California 94550•Telephone(415)422-1100•Twx 910-386-8339 UCLLL LVMR <br />