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CORRECTIVE ACTION REPORT (834-D1U1) On July 27, 1994, the 1000-gallon steel underground diesel fuel tank 834-D1U1, identifed by San Joaquin County as 39-1945-12, at Lawrence Livermore National Laboratory Site 300 Building 834 was removed from the ground and shipped off- site as hazardous waste. Bill Snavely of the San Joaquin County Environmental Health Division (SJC-EHD) was present to witness closure activities and the collection of soil samples. After removing the tank we became aware that the underlying gravel fill and soil smelled of diesel fuel. Excavation was stopped at a depth of 13 feet because of the proximity to the underlying perched aquifer. Soil samples were collected from the bottom of each end of the excavation at a depth of 13 feet. The samples were submitted for analyses of diesel fuel (TPH-D) and BTXE. Laboratory analytical results and chain of custody records for the environmental samples are enclosed as Appendix E. Groundwater was measured to be 17 feet 8 inches below ground surface in the water monitoring well _ group g An Unauthorized Release Report was completed and both FAXed and mailed to San Joaquin County Public Health Services on August 3, 1994. A copy of the release report is enclosed at Appendix G. Bill Snavely stated a belief that the diesel fuel evident below the tank was associated with the previously identified diesel fuel in groundwater samples collected from well W-834-D8, and that both have the underground diesel fuel tank as their source. This lead Mr. Snavely to transfer the closure site to Ms. Diane Hinson, Supervisor, Site Mitigation / Local Oversight Program for investigation. The results of analyses of soil samples collected from a depth of 13 feet at the bottom of each end of the tank excavation showed 6900 mg/kg of diesel fuel (TPH-D) and 0.39 mg/kg of xylene (BTXE) in soil from the west end, and 410 mg/kg of diesel fuel and no BTXE detected in the east end sample. On August 1, 1994, the 834-D1U1 tank closure project was discussed with Diane Hinson, after having been transferred by Bill Snavely. Ms. Hinson was first notified of the 834-D1U1 tank closure project on March 4, 1994. On March 4, it was noted that the upcoming closure of the 834-D1U1 underground diesel fuel tank system might reveal a release that would explain the small concentrations of diesel fuel detected in water samples collected from well W-834-D8. It was further explained that a project has been developed in response to The Federal - 7 -