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I26 April 2000 AGE-NC Project No 99-0520 Page 7of8 - y 5 2 HYDROCARBON-IMPACTED SOIL A total of eighteen soil samples were analyzed for TPH-g, TPH-d, BTEX, DIPE, ETBE, MTBE, TAME and TBA in accordance with techniques prescribed by EPA Methods 8015 Modified and 8260 Modified, respectively • TPH-g and BTEX compounds were all detected in soil sample SB 1-10 TPH-g was detected at a concentration of 4 mg/kg Benzene,toluene, ethylbenzene and total xylene were detected at concentrations of 12,ug/kg, 5 ,ug/kg, 5 ,ug/kg and 20,ug/kg, respectively Total xylene was also detected in sample SBI-15 at a concentration of 5 ,ug/kg • TPH-d was detected In soil samples B1-10 at 4 mg/kg • The oxygenated fuel additive MTBE was detected in seven of the soil samples analyzed The concentration of MTBE detected in the seven soil samples ranged from 7 ,ug/kg to 2,720 ,ug/kg The highest MTBE concentration was detected from soil collected from the former dispenser area at ten feet bsg(SBI), significant concentrations were also detected at depths of 5 feet and 15 feet bsg No MTBE was detected at 35 feet or 40 feet bsg 1• Laboratory results of soil samples analyzed for petroleum hydrocarbons are summarized in Table 1 The laboratory reports (PET Laboratory ID AD0210-07 through AD 0210-18),quality assurance and quality control,(QA/QC) reports and chains-of-custody are Included In Appendix D 5 3 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIE{NTS Z o.sF vac f( w�� (c�4-t-,,— Z J. Depth to ground water at the site ranged from 14I I to 14 79 et below the well casing tops The ground water elevations at the site ranged from 8 23 feet above mean sea level (msl) The ground water flow direction and gradient were calculated from the ground water elevation data IContours of the ground water elevation data suggest that the ground water flow was directed toward the northeast from the former UST area The ground water gradient on site was calculated to be 0 0026 under the former UST Figure 3 Illustrates the contoured ground water elevations r 5 4 HYDROCARBON-IMPACTED GROUND WATER After the Installation of the ground water wells on the site, all ground water monitoring wells were monitored and sampled Each sample was analyzed for TPH-g;TPH-d and BTEX, with analysis for MTBE In accordance with techniques prescribed by EPA Methods 8020 and 8260 Modified TPH-g, TPH-d, BTEX, DIPS, ETBE, MTBE, TAME and TBA compounds were not detected In the ground Iwater samples collected and analyzed from the site IAdvanced CeoEnvironmental,Inc.