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0 0 <br /> Supplemental Information <br /> The 865-D1U1 tank system was installed in 1982 and is located on the south end <br /> of the west side of Building 865. It supplies diesel fuel to the Building 865 boiler. <br /> The tank system consists of a 4,000-gallon, single-wall FRP underground storage <br /> tank (UST), associated fill pipe, vent pipe, and fuel supply and return piping. <br /> The system was registered with the State Water Resources Control Board in 1986 <br /> as 865-11D and has subsequently been renamed 865-D1U1. Figure 1 (see <br /> Appendix B) shows the location of Building 865 at Lawrence Livermore National <br /> Laboratory Site 300. Figure 2 shows the location of tank 865-D1U1 with respect to <br /> Building 865. Figure 3 shows the plan view of tank 865-D1U1 showing proposed <br /> soil sample locations. (Note: If a concrete slab is determined to exist below the <br /> underground tank it will be removed, if feasible. If not, soil samples will be <br /> collected below each corner of the concrete slab rather than from below each end <br /> of the tank. The San Joaquin Inspector may request that a sample be collected <br /> from below the center of the tank also.) <br /> UST 865-D1U1 has not leaked according to previous tank testing reports. Recent <br /> test results, for the test performed in March 1994, are included as Appendix C. <br /> They show that the tank and associated underground piping are leak tight. <br /> If soil contamination is discovered, up to 10 cubic yards of contaminated soil may <br /> be removed at the time of the tank removal. Underlying soil will then be <br /> sampled to determine if any contamination remains in the soil. If soil <br /> contamination appears to be more than minor, or if there is an indication of <br /> contaminated groundwater, LLNL will perform further investigation and <br /> cleanup activities in agreement with San Joaquin County Public Health Services. <br /> Contaminated soil will be stored, sampled, and disposed of properly. <br /> The contractor TSDF receiving the tank will cut it up to prevent its re-use as a <br /> tank. <br /> Water samples from the groundwater monitoring wells near 865-D1U1 (see <br /> Figure 4) are not currently analyzed for diesel fuel. If soil contamination is <br /> found, and if there is reason to suspect that the contaminants have migrated <br /> from the area, groundwater samples from the monitoring wells will be analyzed <br /> for diesel fuel. However, groundwater contamination is not expected due to the <br /> tank integrity and the depth to groundwater of approximately 120 feet. <br /> A-1 <br />