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Treadwell&Rollo <br /> Area 2A, and to a much lesser extent at Area 4. Groundwater is minimally impacted at Area 3, <br /> and arsenic in soil at Area 3 also impacts HI and excess cancer risk calculations. A summary of <br /> the findings of the field investigation and Preliminary Endangerment Assessments (PEAS) <br /> prepared for each site follows. <br /> 1 <br /> Area 2A—Former Union Oil/L&M Petroleum/Morton Paint Company <br /> Soil in the northwest corner of Area 2A contains significant concentrations of Total Petroleum <br /> Hydrocarbon(TPH) as gasoline and diesel, and benzene, toluene, ethylbenzene, and xylene <br /> (BTEX). Soil recovered and analyzed from boring 2AMW-12, located immediately offsite in <br /> ' Weber Avenue, had concentrations of TPH as gasoline and diesel at up to 7,000 mg/kg and <br /> 8,300 mg/kg, respectively, at 25 feet below grade (bgs). Soil from 16 feet bgs at 2AMW-13 had <br /> ' TPH as diesel and gasoline concentrations of 6,900 mg/kg and 1,800 mg/kg, respectively. On <br /> site, 2AMW-14 had concentrations of TPH as gasoline and diesel at 300 mg/kg and 3,600 mg/kg, <br /> ' respectively, at 10 feet bgs. <br /> ' Soil from test pits 2ATP-4 and 2ATP-5 also exhibited elevated concentrations of TPH as <br /> gasoline and diesel, and BTEX, at 6 and 10 feet bgs. TPH as diesel was found at 8,800 mg/kg at <br /> 2ATP-5 at 6 feet bgs. Additional volatile organic compounds that are likely associated with <br /> petroleum fuels were detected in these soil samples. <br /> I <br /> All of the significant petroleum fuel hydrocarbon concentrations were detected in the northern <br /> portion of Area 2A,with the highest concentrations either at or directly off site from the former <br /> L&M Petroleum facility. Significant concentrations of petroleum fuel hydrocarbons were not <br /> detected in soil collected at the former Morton Paint Company. With the exception of TPH as <br /> motor oil. These results tend to confirm the 1996 Treadwell & Rollo soil investigation analytical <br /> results, summarized in Table 1 A. <br /> ' Semi-volatile organic compounds were detected only at 2ATP-5 at 6 feet bgs. These compounds <br /> were anthracene (1,360 ug/kg), flourene (2,080), and 2-methyl-napthalene (9,080 ug/kg). <br /> t13 <br /> 25970119.DGD 13 December 1999 <br />