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16 August 2001` AGE-NC Project No 97-0312 Page 5 of 20 R "` • �Novethber 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, BTEX and 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, ' s respectively Stockpile sampling was summarized the AGE's Quarterly Report-December 1997, dated,13 February 1998 F • June 1999- Soil borings B 14 through B 17 and monitoring well UST-6 were installed at the site and soil and grab ,water samples were collected Borings B14 through B17 were advanced to a vertical depth of approxmiately 100 feet below surface grade (bsg), boring IUST-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 the 24 samples analyzed (B14-20, B14-30, B15-15, B15-20, B 17-25 and IB17-40) 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 petroleunn hydrocarbons were not detected in the 24 soil samples analyzed MTBE was detected by EPA Method 8260 in samples B14-20,B1 7-25 and BI 7-40 at concentrations of 10 0 41 mg/kg, 2 mg/kg and 8 1 mg/kg, respectively Tert-butanol was detected in sample ti- B 14-20 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 I and B17-50 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 4 µg/1 in the sample from B-14 to 9,700 µg/1 in the sample from B-17 , September 1999- Twelve soil bonngs were advanced at the site Bonngs B 18 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 to 11 of the 39 samples analyzed at concentrations as,hzgh as 660 mg/kg (B21-10) Benzene was detected in four of the 39 samples at coneentrat>ons as high as 0 057 mg/kg Toluene was detected in sample B21'-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 seven soil samples analyzed by EPA Method 8260 at concentrations as high as 2 7 mg/kg Other oxygenates were not detected 4 1 ES 1 4.0 SOIL CHARACTERIZATION Stratigraph>ic descriptions'presented in several ESE reports,in addition,boring logs recorded during • AGE's site assessment investigations were used to characterize the geological and hydro-geological 1 1 Advanced GeoEnvtron mental,Inc I 1