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LivermoreoNational La ator <br /> Lawrence y <br /> September 30, 1991 <br /> Mr. Doug Wilson <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 2009 <br /> Stockton, CA 95201 <br /> Subject: Third Quarter 1991 Status Report on LLNL Closure Activities for <br /> Underground Storage Tank 850.D1U1 (850-41D) as Regulated <br /> under Title 23,California Code of Regulations,Section 2652 (d). <br /> Dear Mr. Wilson: <br /> This letter serves as the July through September 1991 Quarterly Status <br /> Report for underground storage tank (UST) closure activities at Site 300 <br /> which are managed by Lawrence Livermore National Laboratory's (LLNL) <br /> Environmental Restoration Division. LLNL's Operations and Regulatory <br /> Affairs Division manages several other UST projects and those reports are <br /> submitted separately. <br /> UST 850-D1U1 (850-41D) <br /> During the summer of 1991 we conducted remedial action at the <br /> Building 850 tank excavation at Site 300. The tank excavation once <br /> contained a 1,500 gallon, diesel-fuel UST. The excavation has been open <br /> since 1985 when the UST was removed. Our remedial action addresses the <br /> diesel fuel that was released during the tank removal operation. <br /> Characterization of the area was completed in 1990 and a report titled <br /> Investigation Report for the 850-DI UI Underground Storage Tank at <br /> Lawrence Livermore National Laboratory Site 300 was completed in <br /> December 1990. <br /> In August and September 1991, we deepened the floor of the tank <br /> excavation by about 13 ft so that we could remove all the soil and bedrock <br /> containing in excess of 100 ppm Total Petroleum Hydrocarbons as Diesel <br /> (TPH-diesel). Approximately 100 yd3 of soil and bedrock was excavated. <br /> This earthen material has been wrapped in polyethylene sheeting and <br /> stockpiled at the Building 850 lower corp yard. <br /> During the final phase of the September excavation, the hydraulic line <br /> actuating the clam-shell bucket broke. Approximately one gallon of <br /> petroleum-based hydraulic fluid sprayed onto the north wall of the <br /> excavation. After repairing the line, excavation continued until all visible <br /> hydraulic fluid was removed. <br /> During the course of the excavation operation we collected eight soil and <br /> bedrock samples for laboratory analyses. Six soil samples were collected <br /> An Equal Opportunity Employer•Universit yof California•P.O.Box 808 Livermore,California 94550•Telephone(415)422-1100•Twx 910-386-8339 UCLLL LVMR <br />