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Closure Plan As approved by the SJCPHS-EHD, the Closure Plan included specifications for tank inerting, removal, and disposal. The soil sampling protocol discussed the locations of soil samples, soil sampling collection techniques, chain of custody procedures, and laboratory analytical methodologies. Tank transporter and hazardous waste contractors were also specified. Excavations and Removal of Tank and Piping Two excavations, one for the tank and the other for the piping, were dug so that both the tank and piping could be removed. The depth of the tank excavation was 13 ft below the upper surface of the asphalt pavement. The piping excavation was 5.5 ft deep and extended northward from the telecommunication line to the elevated sidewalk. All piping was removed from the tank and piping excavations except for the piping beneath the elevated sidewalk (Figure 2). This piping was drained and then sealed with soldered caps. The tank was visually inspected after it was removed from the tank excavation. No perforations or holes were evident. As shown in Appendix B and Appendix C, the UST was transported offsite on October 18, 1990 by Byars Trucking to the Erickson Inc. facility in Richmond, California. Soil Samples In accordance with the closure application specifications, soil samples were jointly collected by personnel from LLNL and Science Applications International Corporation. Soil sampling locations are shown in Figure 2. Soil samples 3, 4, and 7 were collected using a hand-held drive sampler and stainless-steel liners (Figure 2). Samples 2, 5, and 6 were collected from the backhoe bucket during the excavation using stainless-steel tubes. This was done at the direction of the SJCPHS-EHD representative because the soil material contained much gravel that prevented use of the drive sampler. Prior to storage on ice, the stainless-steel tubes were sealed with teflon sheets, plastic caps, and friction tape. The soil samples were analyzed by Clayton Environmental Consultants for Total Extractable Petroleum Hydrocarbons as Diesel (TEPH- Diesel) using EPA Extraction Method 3550 combined with EPA Analytical Method 8015. Soil samples were also analyzed for BTE and X/Purgeable Aromatics using EPA Analytical Method 8020, which integrates EPA Extraction Method 3550. See Appendix D, E, and F for analytical results, signed laboratory reports, and chain-of-custody records, respectively. On June 20, 27, and July 10, 1990, a total of six soil samples were collected and numbered according to the Closure Plan numbering scheme. As shown in Figure 3: • June 20—Soil samples 3 and 4 were collected from above the tank at the fill pipe-tank connection. These samples yielded TEPH-Diesel concentrations of 4400 and 2300 mg/kg (ppm),respectively. 3