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! Lawrence Liverm le N <br /> ationai Laborator�� <br /> L , <br /> August 3, 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, Tank 834-D1U1 at Building 834 <br /> Attached is an Underground Storage Tank Unauthorized Release (Leak)/ <br /> Contamination Site Report for tank system 834-D1U1 at Lawrence Livermore <br /> National Laboratory Site 300. <br /> Underground storage tank 834-D1U1 at Building 834 was a 1000 gallon single-wall <br /> carbon steel tank that supplied diesel fuel to the Building 871 standby generator. <br /> On July 27, 1994, the tank system was closed and the tank was removed from the <br /> ground. The smell of diesel fuel was noted in the excavation in the excavated <br /> materials. <br /> Soil samples were collected within the excavation and from the soil removed from <br /> the excavation and submitted for analyses of diesel fuel (TPH-D) and BTXE. The <br /> collection and preparation of samples was witnessed by Bill Snavely of your office. <br /> We will forward the analytical laboratory's report of the results of analyses when it <br /> becomes available. <br /> Mr. Snavely stated a belief that the evidence of diesel fuel in the soil below the tank <br /> was associated with the previously detected diesel fuel in groundwater in the nearby <br /> monitoring well installed in the shallow perched aquifer in the Building 834 area. <br /> Because the tank system has consistently tested leak tight, the suspected cause of the <br /> contamination is historic tank overfilling. <br /> If you have any questions regarding this matter, please contact Richard Henry at <br /> (510) 423-3641. <br /> Sincere] <br /> Susi Jackson, Division Leader <br /> Operations and Regulatory Affairs <br /> Environmental Protection Department <br /> CSJ:rkh/eam <br /> Attachment <br /> An Equal Opportunity Employer•University of Califomia•P.O.Box 808 Livermore. CA 94551-9900•Te!ephone 1510)422-1100 •Twx 910-386-8339 UCLLL LVMR <br />