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�a <br /> J <br /> W <br /> • -ti <br /> r 4.0 RESULTS <br /> G <br /> are explained in Table 1 and precise sample <br /> Sample numbers for in-situ samples <br /> locations are shown in Appendix B. Sample analytical results are shown in <br /> Table 2. <br /> p 4.1 NEW UST EXCAVATION <br /> rx Organic constituents (TPH-gasoline, BTEX components, ethylene dibromide) were <br /> c , <br /> i-` not detected in any of the in-situ soil samples from the excavation for the <br /> new fuel USTs. Total lead was detected at concentrations of 0.97-5.8 mg/kg <br /> (ppm). Subsequent evaluation of lead solubility by Waste Extraction Tests <br /> r; <br /> (WETS) determined that those samples which had total lead in excess of 5 ppm <br /> y ihad soluble lead concentrations of 0.043-0.10 mg/L. <br /> IJ <br /> The total lead results are typical for San Joaquin Valley sites and probably <br /> represent background inorganic lead, a natural constituent of most soils. The <br /> lead WET results are far below soluble threshold limit concentrations (STLCs) <br /> for lead (5 mg/L). <br /> - i <br /> f I i. <br /> r. , 4.2 EXISTING FUEL PIPING AND UST EXCAVATIONS <br /> Hydrocarbons were detected as TPH-g at concentrations up to 3,500 mg/kg (Ppm) <br /> in in-situ samples from the fuel UST excavation. Concentrations were greatest f <br /> along the southwestern margin of the excavation (Samples SST-2-S and SST-3-S), i <br /> I <br /> where fuel pipes exited the excavation. BTEX components were also detected in - <br /> in-situ samples from this excavation. Hydrocarbons were detected as TPH-g at <br /> xr , <br /> q concentrations up to 577 mg/kg (ppm) in in-situ soil samples fron the fuel <br /> pipe trenches. Ethylene dibromide was detected beneath both ends of Tank 3 <br /> (leaded gasoline) at concentrations of 0.9 and 5.2 u9/k9 (ppb) but was not <br /> detected in the fuel pipe trenches. Total lead was also detected in samples <br /> from beneath Tank 3 (leaded gasoline) at 4.4 and 9.5 mg/kg (ppb)• . Subsequent <br /> WETS determined that this lead was present at soluble concentrations up to <br /> 0.30 mg/L, well below the lead STLC. Wet results for lead from samples In the <br /> fuel pipe trenches ranged from 0.08 to 0.94 mg/L, also well below the lead <br /> STLC. <br /> � .4iA:ENG:9199/041591 <br />