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w - <br /> 0 <br /> ■ Lawrence Livermore National Laboratory <br /> 1 May 22, 1992 <br /> Doug Wilson 2 6 1992gj �`jry�(�y)\� <br /> Environmental Health Division <br /> Public Heath Services PERI'vis <br /> San Joaquin County <br /> P. O. Box 2009 <br /> Stockton, Ca 95201 <br /> Subject: Underground Storage Tank Unauthorized (Leak) / <br /> Contamination Site Reports, Tanks at Buildings 875 and 877 <br /> Dear Mr. Wilson: <br /> Attached are Underground Storage Tank Unauthorized Release (Leak) / <br /> Contamination Site Reports for tank systems 875-DlU1 and 877-D1U1 at <br /> Building 875 and 877, also known by your designation as tanks 14 and 20, <br /> respectively. <br /> The releases were determined by review of the results of analyses of samples <br /> of soil and fill gravel collected as part of closure activities. Samples were <br /> collected on May 5 in the presence of Bill Snavely of your office. The results <br /> of analyses were received from Clayton Environmental Consultants, the <br /> analytical laboratory, at the close of business May 13. These results are <br /> attached. On May 14, Richard Henry of my staff notified you of the results of <br /> the analyses. You advised Mr. Henry to submit an unauthorized release <br /> report for each of the two closure projects. These forms are attached. <br /> The Building 875 closure sample analyses showed the following: The <br /> samples collected from each end of the bottom of the excavation to remove <br /> the tank showed ND (nothing detected) and 2 ppm diesel fuel. The sample <br /> collected below the underground piping showed ND. The two samples <br /> collected in the pile of soil and fill materials removed from the excavation <br /> showed 95 ppm and 31 ppm. Your advice that we submit an unauthorized <br /> release form for the Building 875 project was based on consideration of the <br /> results of analyses of the samples collected from the fill pile. The samples <br /> collected at the bottom of the excavation showed that the hole is clean. The <br /> excavation will be the site for installation of the new doubly contained <br /> system. <br /> Building 877 tank closure sample analyses results are different. Samples <br /> collected from the bottom of the excavation showed 6400 ppm diesel fuel at <br /> the east end and 180 ppm diesel fuel at the west end. The sample collected <br /> below the piping showed ND. Two samples collected from each end of the fill <br /> An Equal Opportunity Employer•Universityof California•P.O.Box 808 Livermore,California 94550•Telephone(415)422-1100•Twx 910-386-8339 UCLLL LVMR <br />