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• • Tank 815-11D was a 10,000-gallon carbon steel tank installed in 1959 to provide diesel fuel for a boiler in Building 815. The tank system was registered with the State Water Resources Control Board in June 1984 using the Hazardous Substance Storage ® Statement enclosed as Attachment 1. In August 1985, the 815-11D tank system was filled to near ground level with diesel fuel and tested according to the Precision Test requirements specified by Title 23 of the California Code of Regulations (CCR), Section 2643. The test conducted by • McKesson Environmental Services, using the Horner EZY-CHEK equipment, showed a product volume loss (leak rate) of approximately 0.033 gal/hr, which is below the acceptable regulatory leak rate of 0.05 gal/hr (Table 1, Attachment 2). The certificate ® of compliance is enclosed as Attachment 3. In June 1986, the tank was removed by the Lawrence Livermore National Laboratory (LLNL) Plant Engineering Department. The excavation was backfilled to grade and repaved. It is believed that the associated piping and belovwground vent line were removed at the same time. Although no written documentation can be located, interviews with personnel familiar with the project indicate that the piping and vent line were removed at the time of tank removal. The near proximity of the tank to Building • 815, and the fact that the above-ground vent line is not in place, tend to support this account. In September 1987, under contract with Universal Engineering Incorporated, the tank was cleaned and certified to be reusable as scrap metal (Attachment 4). As • required by Section 121.02(C)(2) of the contract specifications (Attachment 5), the tank was removed from the job-site and reused according to arrangements and negotiations completed by Universal Engineering Incorporated. On two occasions in March 1989, a team of LLNL personnel and Science • Applications International Corporation personnel obtained soil samples in order to verify that no unauthorized releases form the tank had occurred. The Chain-of-Custody records are included as Attachment 6. Sample locations are shown on the site map • included as Attachment 7. Blueprints were used to estimate the tank's former location 1 •