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5.0 LABORATORY RESULTS <br /> 5.1 Excavation Samples <br /> Very low concentrations of gasoline-range hydrocarbons were detected in samples from the north <br /> end of tanks #2 and 93 (Table 1). Both of these samples appear to be depleted of volatile <br /> compounds (benzene) and enriched in the less volatile xylenes and ethylbenzene. <br /> TABLE 1 <br /> Summary of Analytical Results: Alpine BP <br /> ,S2il Matrix <br /> All result are in mg/kg(ppm) <br /> ID# Bate Gnsoiine Diesel Lead Benzene Toluene Ethylbenzene Xylenes <br /> 3S 9/14/94 ND -- ND ND ND ND ND <br /> 2S 19,000 --- 10 12 650 410 3,000 <br /> IS 8,500 --- 15 ND 55 94 750 <br /> 1N ND --- 4.9 ND ND ND ND <br /> 2N ND ---- 4.1 ND ND ND 0.029 <br /> 3N ND -- ND ND 0.019 0.010 0.086 <br /> ND = Not Detected — = Not analyzed <br /> No hydrocarbons were detected above mandatory detection limits in the samples from the south <br /> end of tank#3 and north end of tank #1. <br /> Moderate to high concentrations of hydrocarbons were detected in samples from the south ends of <br /> tanks #1 and#2. This supports the field observation of significant staining and strong odors <br /> beneath these tanks. Based on the detected concentrations and the generally sandy texture of the <br /> soil, soil contamination in the center of the excavation probably extends to a depth of several feet <br /> Wow the present floor. <br /> The sample from the waste-oil tank was analyzed for both diesel-range hydrocarbons and oil and <br /> grease, in addition to gasoline-range hydrocarbons (Table 2). Only xylene was detected. This <br /> sample was also analyzed for volatile Mdocarbons and semi-volatile hydrocarbons, including <br /> PCB's, and for five priority metals. Very low concentrations of dichlorobenzene and naphthalene <br /> were detected, and metals concentrations were within background ranges for the Stockton area. <br />