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1 2 2 UST System Removal <br /> On August 13, 1996, Fisch Environmental removed the two USTs The USTs included an 8,000- <br /> gallon tank (Tank 1) and a 1,000-gallon tank (Tank 2) According to the PHS/EHD inspection <br /> notes, both tanks appeared corroded, and holes were observed in the 1,000-gallon UST <br /> Gasoline odor was also noted in both UST excavations <br /> Two soil samples were collected from beneath each former UST, and a single soil sample was <br /> collected from beneath the former dispenser The soil sample locations are shown on Figure 2, <br /> and the sod sample analytical results are summarized in Table 1 <br /> The soil sample collected from beneath the former dispenser island contained the highest <br /> concentrations of gasoline hydrocarbons This sample contained 12,000 mg/kg of TPH-as- <br /> ' gasoline, 67 mg/kg of benzene, 710 mg/kg of toluene, 220 mg/kg of ethylbenzene, 1,200 mg/kg of <br /> xylenes, 215 mg/kg of total lead, and 2,100 mg/kg of TPH-as-kerosene All four of the soil <br /> samples collected from beneath the former USTs contained detectable concentrations of TPH-as- <br /> ' gasoline (up to 2,000 mg/kg), toluene (up to 26 mg/kg), ethylbenzene (up to 7 1 mglkg), and <br /> xylenes (up to 16 mg/kg) Methyl tertiary butyl ether (MTBE) was not detected in any of the <br /> samples analyzed <br /> 12 3 Preliminary Investigation and Evaluation <br /> On April 16, 2001, Ramage Environmental published Preliminary Investigation and Evaluation <br /> Report, which documented the results of soil and groundwater-grab sampling from three on-site <br /> Geoprobe soil borings (G-1, G-2, and G-3) The boring locations are shown on Figure 2 <br /> Soils observed in the three soil borings consisted mostly of clay and silt sequences to the total <br /> drilling depth of 35 feet bgs During drilling, groundwater was first encountered at depths ranging <br /> from 23 5 to 26 0 feet bgs <br /> i <br /> I <br /> Results of the investigation indicated that soil and groundwater beneath the site had been <br /> impacted by petroleum hydrocarbons The soil sample analytical results are summarized in Table <br /> 1, and the groundwater analytical results are included in Table 2 <br /> i 6 <br /> I <br />