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Site Background Information former Blue Star Gasoline Page 2 of 2 rock sources ' Based ground water data collected during a recent ground water monitoring event, ground water at the site Is located approximately 65 feet below surface grade (bsg), and flows toward the south- southeast UNDERGROUND STORAGE TANK REMOVAL On 06 March 2002, three USTs, two dispenser Islands, and associated piping were removed from ' the site under AGE supervision Six samples were collected beneath the USTs and three laboratory- composite/discrete soil samples were collected from the excavated soil ' Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively) were detected at concentrations up to 86 milligram per kilogram(mg/kg)and 0 015 mg/kg Toluene, ethylbenzene and xylenes were detected at concentrations as high as 13 mg/kg(xylenes)!The highest concentrations of contaminants were present in the southern samples from Tanks #2 and #3, this location was the fill area for both USTs ' Approximately 200 tons of soil were excavated during removal of the USTs Two laboratory- composite and one discrete soil samples were collected from the stockpiled soil prior to placement `- back into the excavation after completion of the UST removal, the soil was placed back into the excavation because of the proximity to a major roadway Subsequent analytical results of the discrete 1 soil sample from one stockpile of approximately 25 yards of soil detected TPH-g at 13 mg/kg and benzene at 0 023 mg/kg ' PREVIOUS SITE ASSESSMENT In April 2003, three soil borings (B1, B2,and B3)were advanced at the site(Figure 2) Each boring ' was advanced to a depth of approximately 65 feet bsg Soil and grab ground water samples were collected from each boring and analyzed 15'61 'D M 11,(4 V r TPH-g was detected in soil samples at concentrate s hl�i as 1-8-mig � TPH-d was detected at co7l frit high as �' �- EX constituents were detected at concentrations as high as Ras lthough detected in one sample using EPA Method 8021, ' methyl tertiary-butyl ether (MTBE) and other fuel oxygenates were not detected In any of the samples selected for analysis using EPA Method 8260 r� ��3— s cPl) (vi ' TPH-g,BTEX, and MTBE were reported in each of the three grab ground water samples collected from the borings at concentrations ranging from 2 3 µg/l to 180 µg/1 Analytical results of soil and ground water samples are Included In Tables 1 and 2 of this appendix Advanced GeoEnvironmental,Inc 1