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0 Lawrence LivermA National Laboratory .f. I- HEALTH SI a F AU G3 1 0 Phi 1; Q 7 August 3, 1994 Ms. Diane Hinson Public Health Services of San Joaquin County Environmmental Health Division P.O. Box 2009 Stockton, Ca 95201 SUBJECT: Building 871 Underground Storage Tank 871-D1U1 Proposal for Corrective Action On July 26, 1994, the 2000-gallon steel underground diesel fuel tank 871-D1U1 at Lawrence Livermore National Laboratory Site 300 Building 871 was removed from the ground and shipped off-site as hazardous waste. Bill Snavely of the San Joaquin County Environmental Health Division was present to witness closure activities and the collection of soil samples. After removing the tank and the fill gravel we became aware that the underlying sandstone smelled of diesel fuel. An Unauthorized Release Report was completed and both FAXed and mailed to your office on August 2, 1994. Results of analyses of the two soil (crushed sandstone) samples collected from the bottom of the excavation show 2500 mg/kg and 3000 mg/kg TPH-D values, and BTXE values ranging from ND for benzene concentrations to 0.42 mg/kg for one of the xylene concentrations. The final report of results of these analyses has been FAXed and mailed to your office today, August 3, 1994. Based on the results of analyses of the soil samples collected within the excavation, it is our understanding that the site project is being transferred to you in the San Joaquin County Site Mitigation / Local Oversight Program. Yesterday, August 2, 1994, Rick Henry discussed with you the Building 871 tank closure project and also the Building 834 tank closure project. Based on your agreement with him, we are FAXing for your immediate review descriptions of the agreements reached regarding these two projects. We will provide a formal report upon completion of the project. Our action plan for tank 871-D1U1, as discussed in your August 2, 1994, conversation with Rick Henry is as follows. The plan of action for the Building 834 tank closure site will be submitted separately. We will perform excavation at the bottom of the existing excavation to remove additional diesel fuel contaminated sandstone. The size of the eventual excavation will be determined by the proximity of Building 871, the hardness of the sandstone, and the reach of the excavation equipment. You will be invited to be present to witness the final portion of the excavation activity and the collection of soil (crushed sandstone) samples from the bottom of the resulting excavation. An Equal Opportunity Employer•University of California•P.O.Box 808 Livermore,CA 94551-9900•Telephone(510)422-1100 •Twx 910-386-8339 UCLLL L VMR