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MR-30-94 WED 17:00 EPD PERMITS.REG. AFFA.IRS .....FA.X-NO, 510 42.3..5490 P.03 LAwmfxs Lhmmim NaUonal Laboratofy March 30, 1994 Mr. Doug Wilson Public Health Services of San Joaquin County Environmental Health Division P.0.Box 2009 Stocktort, Ca 95201 Subject: Underground Storage Tank unauthoxized (LeakY Contamination Site Report,Tanks 879-GIIUI and 879-G2UI, Water Release in Closure Excavatfon Attached is an Underground Storage Tank unauthorized Release (Leak)/ Contamination Site Report for the release of water into the closure excavation for tanks 8N-GIU1 and 879-G2ul at Lawrence Livermore National Lory Site 300, On March 17, 1 4, excavation to prepare to remove the two 10,000 gallon gasoline tanks at Building 879 resulted in rupture Of the on-site at distribution and supply system to Building 879. 3000 gallons of water were pumped from tile excavation. A water sample was collected for analYses by EPA Method 8260 (volatile organics by GC/MS), and Total Petroleum HYdrOcarbOrks CIPH). The EPA Method 8260 analysis showed benzene, toluene, xylene, and ethylbenzene (EITXE) were Present in the samPle in concentrations of I ug/L or less,except toluene at 3.0 ug/L, The TPH analysis showed 2 mg/L TPH, described as " ea iesel fuel,'. Diesel fuel to system 879-DlUl manains buried and in-use at a location next to the excavation tO remove gasoline Lanka 879-GIUI and 879-G2Ul. 879-DiTil is a doubly- contained sYstem installed in 1987. It is continuously monitored for leak tightness and is not suspected of having leaked, alffiov overfilling is a possibility and may account for the Presence Of dk-Isel fuel in the water le® The results of analysis of the water &=pie were received on March 23, 1994, and verbally reported to Bill Snavely Of Your office on the same day. An r:XW0XW'X*EM-1'bYW-UMM*0fCBMMb-P-0.SON MLM%?Me,CA a4wt--cgw*Tuxp,4wm(510)42L7.IIW &TW910-SMAMUCULLYM