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' 08 June 2002 AGE-NC Project No 98-0433 ' Page 6of8 ' 35 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in the ground water samples collected from MW-1, MW-2 and MW-6 at a ' maximum concentration of 1,200 µg11 (MW-6) TPH-d was detected in water samples from wells MW-I through MW-3 and MW-6 through MW-8 ' at concentrations ranging from 57 µg/1 (MW-3) to 11,000 µg/1 (MW-1) BTEX compounds were detected in water samples MW-1 and MW-2 at maximum concentrations ' of 12 µg/1 benzene, 0 83 µg/1 toluene, 5 8 µg/1 ethylbenzene and 3 9 µg/1 xylenes MTBE was detected by EPA method 8260M in samples MW-1,MW-2 and MW-8 at concentrations ' of 2,300 µg/1, 9 6 µg/1 and 6 2 µg/l,respectively In addition,DIPE and TBA were detected in water sample MW-8 at 14 µg/1 and 27 µg/1, respectively ter' No other target analytes were detected in the samples analyzed Analytical results from ground water samples are summarized in Table 2 The laboratory report (MAI Lab ID 90811 to 90819), quality assurance and quality control (QA/QC) and chain-of-custody are Included In Appendix A The ' distribution of dissolved hydrocarbons Is depicted in Figure 4 ' 4.0. SUMMARY AND CONCLUSIONS ' Based upon soil and ground water data collected during advancement of soil boring B 17 in January 2002, AGE concludes ' • Poorly graded fine sand was Identified at a depth between 20 and 30 feet bsg in soil boring B17, silt and silty sand was Identified below 30 feet ' • Petroleum hydrocarbons were detected in soil samples from bonng B17, at maximum," concentrations of 71 mg/kg TPH-g and 230 mg/kg TPH-d from sample B 17-20 In addition, MTBE was detected, at a maximum concentration of 0 3 mg/kg In sample B 17-20 -� ' TPH-g, ethylbenzene, xylenes, MTBE and TBA were detected in the grab ground water sample from boring B 17 at concentrations of 240 µg/1, 0 61µg/1, 1 1 µg/1, 160 µg/1 and 36µg/1, respectively / Based upon ground water data collected during the February 2002 monitoring event,AGE concludes • Ground water at the site was encountered at approximately 19 33 to 21 09 feet below well • casing tops An east-flowing ground water ridge bisects the site, north of the former UST Advanced GeoEnvironmental,Inc