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0-awrence Livermore-Ncl ' al Laboratory <br /> November 15, 1993 j' ►: �5 <br /> Mr. Bill Snavely <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> P.O. Box 2009 <br /> 1601 East Hazelton Avenue <br /> Stockton, CA 95201 <br /> Subject: Submittal of Closure Report for Underground Storage <br /> Tank 814-D1 U1. <br /> Dear Mr. Snavely: <br /> Enclosed you will find a closure report for the underground storage tank (UST) <br /> 814-D1 U1 at the Lawrence Livermore National Laboratory, Site 300, south of <br /> Tracy, California. <br /> The analytical results of the soil sample collected beneath UST 814-D1 U1 were <br /> evaluated by LLNL EPD Tank Representative, Mr. Rick Henry, and compared to <br /> the Practical Quantitation Reporting Limits in the Regional Water Quality Control <br /> Board's Tri-Regional Board Staff Recommendations for Preliminary Evaluation <br /> and Investigation of Underground Tank Sites (TRBSR), dated August 10, 1990. <br /> Based upon the analytical laboratory results of the soil sample collected from <br /> the tank excavation, it was determined that soil beneath the 814-D1 U1 tank <br /> system showed levels of TPH as Diesel and BTEX, below the Practical <br /> Quantitation Reporting Limits in the TRBSR. LLNL shall backfill the lower two- <br /> thirds of the tank excavation with clean fill material. Excavated backfill material <br /> from UST 814-D 1 U 1 tank removal activities shall be used to backfill the top 3-4 <br /> feet of the UST 814-D1 U1 excavation. The LLNL requests that the San Joaquin <br /> County Public Health Services-Environmental Health Division (PHS-EHD) <br /> grant a conditional case closure for the 814-D1 U1 tank system. A State Water <br /> Resources Control Board UST Permit Application Form B shall be submitted to <br /> the PHS-EHD within 30 days of the submittal of this closure report. <br /> If you have any questions, please call Rick Henry, Tank Assessments and <br /> Guidance Group Analyst, at (510) 423-3641. <br /> Sincerely, <br /> C. <br /> /) <br /> C. Susi Jackson, `vi 'on Leader <br /> Operations and Regu tory Affairs <br /> CSJ:ng/emm Environmental Protection Department <br /> Enclosure <br /> An Equal Opportunity Employer-Universit y of California-PO Box 808 Livermore,California 94550-Telephone(415)422-1100-Twx 910-386-8339 UCLLL LVMR <br />