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' 18 April 2000 AGE-NC Project No 98-0534 ' Page 7 of 9 ' a TPH-g was detected in soil samples collected from opposite sides of the former northern 20,000-gallon gasoline UST excavation Soil sample P3-10 contained 3 0 mg/kg of TPH-g and soil sample P9-15 contained 3 8 mg/kg of TPH-g ' a TPH-g was not detected in soil samples collected at 30 feet bsg • TPH-d was detected in soil collected at depth as great as 15 feet bsg at concentrations as high as 46 mg/kg (P3-10') TPH-d was detected In soil at 15 feet bsg at concentrations up to 360 mg/kg(P9-15') TPH-d was detected in soil samples at 15 feet bsg, north of the former UST, south southwest to the center of the former UST area ' TPH-d was not detected In soil samples collected from depths greater than 15 feet bsg • BTEX was only detected in two of the soil samples analyzed Soil sample P9-15 contained ' toluene at concentrations of 0 02 mg/kg, ethylbenzene at concentrations of 0 011 mg/kg and xylenes at concentrations of 0 034 mg/kg Soil sample P3-10 contained toluene at concentrations of 0 077 mg/kg and ethylbenzene at 0 01 mg/kg • The greatest concentrations of BTEX compounds detected were generally in soil samples collected near the former UST area at a depth of 10 feet bsg, BTEX compounds were not � . detected in the former dispenser areas Benzene was not detected to any of the 26 soil samples analyzed u MTBE was detected by EPA Method 8260 in seven of the 26 soil samples and was detected in three of the soil samples analyzed by EPA Method 8020 Y MTBE concentrations detected by Method 8020 In soil from the former UST area at 20 feet bsg were 0 20 mg/kg in both (P5-15') and (P9-15) MTBE was detected in the soil sample collected from boring P5 at 10 feet bsg at a concentration of 0 24 mg/kg • MTBE was also detected by Method 8260 In soil samples collected near the former UST area at 25 feet bsg at a concentration of 6 5 microgram per kilogram(ug/kg) MTBE was detected in six soil samples collected from 10 feet and 15 feet bsg and In sample P9-25 from the northern corner of the former UST area Y TBA was detected by Method 8260 in two soil samples Soil west of the former UST area at a depth of 10 feet bsg contained the greatest concentration of TBA at 210 ug/kg (P5-10) The concentration of TBA decreased in soil boring P3 to a concentration of 150 ,ug/kg at 15 feet bsg Laboratory results of soil samples analyzed for petroleum hydrocarbons and oxygenated fuel additives are summarized in Tables 3 and 4 The laboratory reports (MAI Laboratory ID 24933 to 24959), quality assurance and quality control (QA/QC) reports and chains-of-custody are included in Appendix C Advanced CeoEnvironmentA,Inc