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CLOSURE REPORT FOR UNDERGROUND STORAGE TANK 871-DlU1 CLOSURE REPORT CONCLUSIONS: *At the time of the July 26, 1994, removal of the 871-D1U1 tank, the smell of diesel fuel was noted in the excavation and in the excavated materials. Bill Snavely, San Joaquin County UST Regulator, stated that if the results of analyses of soil (siltstone) samples collected at the bottom of the excavation showed greater that 100 mg/kg TPH-D diesel fuel), the closure site project would be transferred to Diane Hinson, Supervising Environmental Health Specialist, San Joaquin County Public Health Services Site Mitigation and Local Oversight Program. Analyses of the samples showed TPH-D values of 2500 mg/kg and 3000 mg/kg. We contacted Ms. Hinson to develop a plan of action. The resulting agreements and completion of the project are described in the CORRECTIVE ACTION REPORT beginning on page 7. • The tank system consistently tested leak tight. The five 55 gallon drums of diesel fuel contaminated fill gravel removed from around the fill pipe at the time of excavation to remove the tank are the result of overfill spillage since the tank was installed in 1982. The diesel fuel contamination found in the siltstone below the tank and tank fill gravel is the probable result of leakage from the underground diesel fuel tank removed in 1982 prior to the installation of the just removed tank. • Based on the visual evidence and smell of diesel fuel in the excavation and excavated materials at the Building 871 tank closure site, an Underground Storage Tank Unauthorized (Leak)/Contamination Site Report for tanksystem 871-151U1 was completed and submitted to Doug Wilson, San Joaquin County Public Health Services, on August 2, 1994. • The tank closure activities were completed according to the 871-D1U1 Closure Plan and the requirements of Bili Snavely. The subsequent corrective action activities were completed in accordance with the agreement with Diane Hinson of the San Joaquin County Site Mitigation / Local Oversight Program. The project has been completed. LLNL does not plan further closure or remedial activities at the tank closure site. • The stockpiled soil and rubble from the UST 871-DlU1 excavation has not been remediated, nor has a method of proper disposal been determined. Shipping documents and/or manifests will be forwarded to your office when they become available. • Soil compaction was performed as indicated on the Field Density Report (see Appendix F). [ X ] Photographs of tank closure activities are enclosed as Appendix D. [N/A] A copy of the State Water Resources Control Board UST Permit Application Form B shall be submitted to your office within 30 days of the submittal of this report. [N/A] A copy of the State Water Resources Control Board UST Permit Application Form B was submitted to your office with the UST Closure Plan. • The Form B was completed by Mr. Snavely. 6