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rA <br /> �. Laboratory analysis indicated the presence of total petroleum <br /> hydrocarbons (TPH) in the composite water sample at 30 parts <br /> per million (ppm) , and benzene, toluene, and xylene <br /> concentrations (STSG) at 1. 6, 3.0, and 5.3 ppm, respectively. <br /> Analysis of one soil sample collected from the wall of the <br /> waste oil tank excavation <br /> pit showed total hydrocarbon <br /> E conceptrations of 61 ppm, with no detectable levels of <br /> benzene, toluene, and xylenes. Polychlorinated biphenyls <br /> v (PCB) and halogenated volatile organics were also not <br /> detected in the soil sample at the method detection limit. <br /> Laboratory analysis of the soil sample obtained below the <br /> product lines indicated TPH concentrations of 2.0 ppm, with <br /> benzene, toluene, and xylenes at concentrations of 0.22, <br /> 0.34► and 0.29 ppm, respectively. <br /> Er-limi,nary Site Inv <br /> k.a <br /> In August 1986, four monitoring wells (designated MH-1 <br /> through MW-4) were installed onsite by KEI. All wells were <br /> completed to a depth of 20 feet below grade. Gasoline odor <br /> was noted in soils between 1 and 7 feet below grade while <br /> drilling MW-3 and MW-4. No soil samples were collected or <br /> analyzed because of the shallow ground water conditions and <br /> 1, well construction. <br /> At the time of water sampling, no free product was observed <br /> in any of the wells. Petroleum odor was noted in the samples <br /> collected from MW-3 and MLI-4. Analysis of the ground water <br /> samples indicated detectable concentrations of dissolved <br /> i hydrocarbons in MW-3 and MW-4 only. Dissolved gasoline <br /> constituents were not detected in the samples collected from <br /> MW-1 and MW-2- <br /> LdditiQnal Sit v GY;q ;nn 1987 <br /> Based on the results of the preliminary investigation work, <br /> four additional monitoring wells (MW-5 through MW-8) were <br /> installed by KEI in January 1997. Monitoring Well MW-5 was <br /> installed onsite while the other three wells were installed <br /> offsite, as shown in Figure 1.. <br /> During well installation, soil samples were collected from <br /> MW-6 and MW-8 immediately above the water table, at a depth <br /> of 3 feet below grade. There was no visual evidence of <br /> gasoline contamination in the drill cuttings. Total <br /> petroleum hydrocarbon concentrations detected in the soil <br /> samples from MW-6 and MW-7 were 1.8 and 24.0 ppm, <br /> respectively. <br /> 2 <br /> j <br />