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` 17 September 2001 <br /> AGE-NC Project No. 98=0468 <br /> Page 2of7 <br /> 2.2. PREVIOUS INVESTIGATIONS <br /> i <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 from 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 /> (MWS-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 soil 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 GwEnvironmeatal,Inc. <br />