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10 August 1998 AGE-NC Project No. 98-0471 Page 6 of 8 surrounding T1.TPH-g was detected in soil samples T5-3 and T6-3 at concentrations of 67 ppm and 8.7 ppm, respectively. Benzene was also detected in sample T5-3 at a concentration of 1.1 ppm. Other BTE&X compounds were detected in the soil samples at concentrations up to 7.9 ppm(xylene T5-3). TPH-g was detected in a stockpile sample at a concentration of 300 ppm. TPH-d was detected in the stockpiled soils at a concentration of 1,900 ppm and TPH-mo was detected in the same sample at a concentration of 15,000 ppm. BTE&X and MTBE were quantified in this sample at concentrations as high as 52 ppm and 18 ppm, respectively. 4.3. ANALYTICAL RESULTS OF WATER SAMPLES Grab ground water samples collected from trench T1 had a TPH-g concentration of 16,000 parts per billion(ppb,reported as micrograms per liter). BTE&X compounds were also present in the samples at concentrations ranging from 410 ppb (ethyl-benzene) to 2,500 ppb (total xylenes). MTBE was detected at a concentration of 4900 ppb in the trench water. TPH-d/TPH-mo were detected in trench water samples at concentrations of 10,000 ppb and 7,800 ppb, respectively. Grab ground water samples collected from trenches T7, T8 and T9 did not have detectable concentrations of TPH-g. BTE&X compounds were present in the samples at concentrations as high as 5.7 ppb (total xylenes). MTBE was not detected in these trench water samples. Grab ground water samples collected from the ditch contained TPH-d and TPH-mo. The grab water sample collected on 03 July contained diesel and motor oil at concentrations of 230 ppb and 560 ppb, respectively. The subsequent grab water sample collected on 08 July contained diesel and motor oil at concentrations of 6,800 ppb and 62,000 ppb, respectively. The well water sample collected from the property on 03 July contained no detectable concentrations of petroleum hydrocarbons. 5.0. DISCUSSION/CONCLUSIONS Based upon data collected from the site during excavation and sampling, AGE concludes the following: • Approximately 50 tons or 45 cubic yards of hydrocarbon-impacted soil was removed from three excavations on the property in July 1998. The soil types encountered in the trenches Advanced GeoEnvironmental,Inc.