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, .1 r _i_71 t•ry R _ , 12 February 2002 AGE-NC Project No'97-0312 ; Page 3 of 18 n� iL r ' ' Removal Report - September 1997 prepared by AGE Analytical results,of soil samples ' collected during the UST/product piping removal are summarized in Tables 1 and 2 Soil sample locations are illustrated in Figure 3 ' November 1997- On 22 November 1997, the stockpiled soil was spread to a thickness of „ approximately three feet On 24 November 1997, a total of 16 samples were collected from the stockpiled soil and analyzed for TPH-g,TPH-d,benzene,toluene,ethylbenzene and total Is xylenes (BTEX) and methyl tertiary butyl ether(MTBE) TPH-g and TPH-d were detected ' in the samples at concentrations as high as 1,500 mg/kg and 4,100 mg/kg, respectively ' Stockpile sampling was summarized the AGE's Quarterly Report -December 1997, dated . 13 February 1998 i • June 1999- Soil bonngs B14 through B17 and monitoring well UST-6 were installed at the site and soil and grab water samples were collected The borings were advanced to further define the hydrocarbon-impacted soil plume,UST-6 was installed to delineate the northern extent of hydrocarbon-impacted ground water Bonngs B 14 through B 17 were advanced to ' a vertical depth of approximately 100 feet below surface grade (bsg), bonng UST-6 was drilled to a vertical depth of 75 feet bsg TPH-g was detected in samples B14-20 and B15-15 at concentrations of 570 mg/kg and 540 mg/kg, respectively TPH-d was detected in six of r the 24 samples analyzed (B14-20, B14-30, B15-15, B15-20, B17-25 and B17-40) at concentrations as high as 13,000 mg/kg(B14-20) Benzene was detected in sample B14-20 at a concentration of 1 mg/kg Toluene,ethylbenzene and xylenes were detected in samples B14-20 and B15-15 at concentrations as high as 9 8 mg/kg Other petroleum hydrocarbons were not detected in the 24 soil samples analyzed MTBE was detected by EPA Method 8260 in samples B14-20, B17-25 and B17-40 at concentrations of 0 41 mg/kg, 12 mg/kg and 8 1 mg/kg, respectively Tert-butanol was detected in sample B14-20 at a concentration of 0 3 mg/kg Other oxygenates were not detected in these three samples or in sample B15-15 ' MTBE was detected by EPA Method 8020 in samples B 14-30 and B 17-50 at concentrations of 0 051 mg/kg and 0 54 mg/kg,respectively Additionally,grab ground water samples were collected from borings B-14, B-15 and B-17 TPH-g, TPH-d, MTBE and BTEX were detected in each sample MTBE concentrations ranged from 6 4µg/1 in the sample from B-14 to 9,700 µg/1 in the sample from B-17 n I September 1999- Twelve soil bonngs were advanced at the site to further define the lateral and vertical extent of hydrocarbon-impacted soil Bonngs B18 through B29 were advanced _ to vertical depths between 30 and 70 feet bsg TPH-g was detected in only one sample (B21-10) at a concentration of 6 7 mg/kg TPH-d was detected in 11 of the 39 samples analyzed at concentrations as high as 660 mg/kg(B21-10) Benzene,was detected in four of the 39 samples at concentrations as high as 0 057 mg/kg Toluene was detected in sample IB21-10 at a concentration of 0 091 mg/kg Ethylbenzene and xylenes were not detected in , • the soil samples analyzed from the September 1999 drilling MTBE was detected in three of i Advanced Geo Environmental,Inc t -