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15 August 2002 AGE-NC Project 02-0946 Page 6 of 7 4.4. ANALYTICAL RESULTS OF GROUND WATER SAMPLE PB-2 The ground water sample collected from boring PB-2 contained TPH-g at a concentration of 270 micrograms per liter(µg/1). BTEX compounds were detected at concentrations of 2.6 µg/l(toluene), 2.3 µg/l (ethylbenzene) and 27.6 µg/l (total xylenes). Napthalene, n-propylbenzene, 1,2,4- trimethylbenzene, 1,3,5-trimethylbenzene and n-butylbenzene were detected at concentrations of 3.7 µg/1, 1.1 µg/l, 14 µg/l, 4.1 µg/1 and 1.2 µg/l, respectively. No other target analytes were detected at or above laboratory reporting limits in the ground water samples analyzed. Analytical results of grab ground water samples are summarized on Table 1. The laboratory report(CTEL Laboratory ID 0207-150-1),quality assurance and quality control(QA/QC) report and chain-of-custody forms are included in Appendix D. 5.0. SUMMARY AND CONCLUSIONS Based upon data collected to date, AGE concludes the following: • One or more area of the subject property appears to have been utilized for waste disposal. It is unclear if the encountered debris is related to former operations at the site or was transported to the site from other locations. The extent of the debris field is not well defined laterally or vertically. • Previous investigations detected petroleum hydrocarbons in soil samples collected from locations at the central and southern portions of the site. Field evidence from the present investigation also detected petroleum hydrocarbons in soil samples collected from boring PB-2; however, laboratory analysis of soil samples collected below 20 feet bsg during the present investigation did not detect any of the target analytes, thereby limiting the vertical extent of impacted soil. The lateral extent of hydrocarbon-impacted soil appeared to be limited laterally to the east by boring B-4, to the north by boring PB-3, the west by boring B-3 and trench T-3 and to the south by boring B-1. • TPH-g and various VOCs,including toluene, ethylbenzene and xylenes,were detected in the grab ground water sample collected from boring PB-2, located within an area utilized for waste disposal. The detected concentrations of VOCs do not exceed DHS' Maximum Contaminant Levels (MCLs) and Action Levels (ALs). • The lateral extent of impacted ground water has not been defined. Advanced GeoEnvironmental,Inc.