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9. <br /> 5 SM_1 <br /> t' <br /> i <br /> It <br /> w <br /> `. 4.3 EXISTING OIL PIPING AND UST EXCAVATIONS <br /> y <br /> r Hydrocarbons were detected as MI-diesel at a concentration of 29 mg/kg in one <br /> +.1 in-situ sample from the motor and used oil UST excavation, This sample was <br /> fi <br /> located along the eastern side of the excavation beneath Tank b (motor oil). <br /> F a No other organic constituents were detected in samples from this excavation. <br /> r Oil and grease werenot detected in in-situ soil samples from the oil pipe <br /> , j trenches. Cadmium, chromium (total), lead (total), nickel and zinc, detected <br /> in samples from beneath the used oil UST and pipe, were all at concentrations <br /> g ri beneath their total threshold limit concentrations (TTLCs). <br /> 5.0 STOCKPILE CHARACTERIZATIt}N <br /> All excavated soils and backfill materials were segregated based upon <br /> potential hydrocarbon contamination and date df excavation (Table 3). <br /> I Stockpile samples were t3ken .at frequencies (cubic yards per composite sanple) <br /> specified by San Joaquin County Public Health Services personnel, as follows: <br /> One sample per 50 cubic yards for stockpiles originating from the <br /> excavation of native materials for placement of new USTs. <br /> One sample per 25 cubic yards for stockpiles originating from the <br /> excavation of former USTs and hydrocarbon piping. <br /> 5.1 NEW UST STOCKPILE <br /> Eight hundred (800) cubic yards of apparently uncontaminated material (P le 1) , <br /> were removed from aformerly-undisturbed area which contained no hydrocarbon <br /> tanks .or pipes. This material was apparently uncontaminated and subsequent - <br /> ;x, testing of 16 composite samples for TPH-gasoline and BTEX detected nothing <br /> rd (Table 4). Following testing of a single composite sample for reactivity, <br /> r <br /> corresivity and ignitability (RCI) (Table 8), this stockpile was disposed at <br /> ' the Vasco'Road.Class IFI landfill in eastern Alameda County. Chain-of-Custody <br /> and Requests for Analysis are shown in Appendix C and laboratory Certificates <br /> { of Analysis erz shown in Appendix E. <br /> 5.2 FUEL PIPING AND UST STOCKPILE <br /> Six hundred:yards' (600) of-apparently contaminated-material-{Pules-2;-5--and 7-} - <br /> fWs`-� were removed from around three fuel USTs and associated piping. Subsequent <br /> �. fi�n. 5 . <br /> 4)A:ENG:9199/04159I <br />