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filter fabric was folded in to completely encapsulate the clean drain rock A one foot layer of <br /> topsoil was then installed to support the overlying landscaping <br /> 4.7 Disposal <br /> IT had segregated the fill material used to backfill the tank excavation in 1988 for possible <br /> future reinstallation into the current excavation, if analytical results revealed no detectable <br /> petroleum concentrations A composite soil sample was collected from this excavated fill <br /> material in order to confirm it to be "clean" Upon analysis, detectable diesel concentrations <br /> were encountered which precluded the reuse of the fill material On November 22, 1994, IT <br /> Corporation representatives loaded the stockpiled fill soils into trucks provided by Caballero <br /> Trucking of San Jose, California Soils were transported under non-hazardous special waste <br /> and asbestos manifest control to BE in Livermore, California, for disposal <br /> The 20 yd' roll off bin used for overexcavated material was transported by Erickson <br /> Incorporated representatives on November 30, 1994 to BFI, as previously described A total <br /> volume of 74 62 tons of diesel impacted soil were disposed Copies of the weighmaster <br /> certificates and transport manifests are included in Appendix C for references. <br /> 5.o Geology/Hydro eolo <br /> g gY <br /> 5.1 Regional Geology <br /> The Pacific Bell facility is located in the Great Valley physiographic province The Great <br /> Valley is a geologic sequence, consisting primarily of alluvial, flood, and delta plains formed <br /> by the valleys two mayor rivers (the Sacramento River and the San Joaquin River) and their <br /> tributaries The resulting topography of the area is flat with an average elevation at the <br /> 1 facility of 48 feet above mean sea level The site is immediately underlain by sands, slits, <br /> clays, and gravels of nonmarine origin, which are of Quaternary age (Norris and Webb, <br /> 1990) These sediments are generally loosely consolidated Runoff of surface water is <br /> generally slow <br /> 5.2 Site Geology <br /> A review of Versar, Inc (1988, 1991) and IT Corporation (1993) boring logs indicates that <br /> the area beneath the former tank location is underlain by sands, and silty sands with silt units <br /> encountered between 9 5 and 18 5 feet below grade and 32 to 45 feet below grade, the total <br /> depth explored IT boring logs can be found in IT Corporation's "Supplemental Investigation <br /> NMOL-27-95/UST/95-Oot L nbr 6 <br />