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31 July 2000 <br /> AGE-NC Project No. 98-0468 <br /> Page 2 of 11 <br /> 2.2. PREVIOUS INVESTIGATIONS <br /> Information regarding previous investigations conducted at the site was obtained from The Twining <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 fiom the site. During removal of the UST, <br /> a'soil sample was collected in'the vicinity of the former fuel dispenser at 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 2). 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 /> Advanced CcoEnvironmental.Inc. <br />