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14 September 1998 <br /> ' AGE-NC-Project No. 98-0468 <br /> Page 2 of 10 <br /> Laboratory's Site Characterization report (Twining, 1997)..'A brief summary of previous <br /> investigation findings is presented below. <br /> Gasoline UST-Removal <br /> In April 1991, a 550-gallon gasoline UST was removed from the site. During removal of the UST, <br /> a soil sample was collected in the vicinity of'the former fuel dispenser Iat four feet below surface <br /> grade(bsg).,Laboratory analysis of the soil sample detected total petroleum hydrocarbons.as gasoline <br /> (TPH-g)*and total petroleum hydrocarbons as diesel(TPH-d). <br /> Diesel UST Removal <br /> In January 1994, a 1,000 gallon diesel UST.was removed from the site. During,UST-removal <br /> activities, a soil sample was collected beneath the west end of the former UST at a depth of 11 feet <br /> bsg: Laboratory analysis of the soil.sample detected TPH-g, TPH-d, benzene,toluene, ethylbenzene', " <br /> . and total xylenes (BTEX); <br /> Preliminary Soil and Ground Water Assessment <br /> In June 1994;soil and ground water assessment activities were conducted'at the site. A total of three <br /> soil borings were completed, soil samples were collected for'analysis, and three monitoring wells ' <br /> (MW-1 through MW-3)were installed in the soil borings (Figure.?.). Relatively low concentrations <br /> of TPH-d were detected in two of the six soils samples collected from the soil borings. <br /> During the period from'June 1994 through.September 1995, three ground water sampling events " <br /> were conducted at the site.During the June 1994 sampling event; laboratory analysis of ground water <br /> samples collected from monitoring well MW-3 detected relatively low concentrations of benzene <br /> (1.4"ppb), total xylenes (1.7 ppb),and TPH-g(55 ppb). There were no other reported detections of <br /> petroleum hydrocarbon compounds in any'of the monitoring wells during the June_ 1994, October <br /> 1994, or September 1995 sampling events. <br /> Soil Excavation and Sampling <br /> In April 1995; petroleum hydrocarbon-impacted soil was excavated and removed from the area of <br /> the former diesel UST. During the excavation activities, soil-samples-were not collected due,to <br /> encountering the ground water table above the base'of the former tank excavation. Therefore, a' <br /> Advanced Gcol~nvironmenjai,Inc. <br />