COMPLIANCE INFO_FILE 9 - Laserfiche WebLink

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CORRECTIVE ACTION REPORT (871-DIUl) 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 Public Health Services was present to witness closure activities and the collection of soil samples. After removing the tank we became aware that the native siltstone underlying the fill gravel smelled of diesel fuel. Samples of the siltstone were collected according to the closure plan from the bottom of each end of the tank excavation at a depths of 120 inches (east end) and 133 inches (west end) and in the bottom the the piping trench at a depth of 36 inches. A plot plan for these samples is provided by page D-2 of Appendix D. The samples were submitted for analyses of diesel fuel (TPH-D) and BTXE. Snavely stated that he would allow TPH-D concentrations to, but not exceeding, 100 mg/kg. The samples were submitted for analyses of diesel fuel (TPH-D) and BTXE. The east end sample showed 2500 mg/kg TPH-D, the west end sample showed 3000 mg/kg, and the piping trench sample showed 23 mg/kg TPH-D. The piping sample showed that the piping trench is clean enough. However, results of analyses of the samples collected in the bottom of the tank excavation caused the site project to be transferred to Diane Hinson, Supervisor, San Joaquin County Site Mitigation and Local Oversight Program, for further investigation and possible remedial action. The results of sample analyses the chains of custody records are enclosed as Appendix E. An Unauthorized Release Report was completed and FAXed and mailed to San Joaquin County Public Health Services on August 2, 1994. A copy of the release report is enclosed at Appendix G. The absence of diesel fuel in the fill gravel below the tank and the presence of diesel fuel in the native siltstone below the fill gravel caused us to conclude that the diesel fuel identified in the siltstone is the result of leakage from the underground diesel fuel tank removed in 1982 to be replaced in the same excavation with the just removed tank. On August 1, 1994, the 871-D1U1 tank closure project was discussed with Diane Hinson, after having been transferred by Bill Snavely. The discussion with Diane Hinson resulted in agreement to immediately proceed to complete field work This understanding and the agreement to proceed with field work are recorded in the San Joaquin County Public Health Services letter "LLNL - Site 300, UST Removals - Bldgs #834 and 871", Diane Hinson of the Site Mitigation Unit to Richard Henry, August 4, 1994 (Appendix H). The agreement to complete field work is explained in detail in our letter "Building 871 Underground Storage Tank 871-D1U1 Proposal for Corrective Action", - 7 -