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R • Lawrence Livermore National Laboratory Li August 3, 1994 Mr. Doug Wilson Public Health Services of San Joaquin County Environmental Health Division P. O. Box 2009 Stockton, Ca 95201 Subject: Underground Storage Tank Unauthorized (Leak)/ Contamination Site Report, Tank 834-D1U1 at Building 834 Attached is an Underground Storage Tank Unauthorized Release (Leak)/ Contamination Site Report for tank system 834-D1U1 at Lawrence Livermore National Laboratory Site 300. Underground storage tank 834-D1U1 at Building 834 was a 1000 gallon single-wall carbon steel tank that supplied diesel fuel to the Building 871 standby generator. On July 27, 1994, the tank system was closed and the tank was removed from the ground. The smell of diesel fuel was noted in the excavation in the excavated materials. Soil samples were collected within the excavation and from the soil removed from the excavation and submitted for analyses of diesel fuel (TPH-D) and BTXE. The collection and preparation of samples was witnessed by Bill Snavely of your office. We will forward the analytical laboratory's report of the results of analyses when it becomes available. Mr. Snavely stated a belief that the evidence of diesel fuel in the soil below the tank was associated with the previously detected diesel fuel in groundwater in the nearby monitoring well installed in the shallow perched aquifer in the Building 834 area. Because the tank system has consistently tested leak tight, the suspected cause of the contamination is historic tank overfilling. If you have any questions regarding this matter, please contact Richard Henry at (510) 423-3641. Sincer (1- Susi Jackson, Di 'si n Leader Operations and Regulatory Affairs Environmental Protection Department CSJ:rkh/eam Attachment An Equal Opportunity Employer•University of California•=T,.Box 808 Livermore,CA 94551-9900•Telephone(510)422-1100 •Twx 910-386-8339 UC'!L LVMR