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i ' 29 April 2004 AGE-NC Project No 98-0511 Page 5 of 7 concern were detected above Iaboratory reporting limits in the same samples,and analytes of concern were not detected above laboratory reporting limits in soil sample P1-30 Analytical results of soil samples collected during the March 2004 investigation and previous investigations are summarized in Tables 1 and 2 A copy of the laboratory report (CTEL Laboratory IDs 0403-088-4, 0403-088-6 and 0403-088-7) is included in Appendix D Cross-section A-A'illustrates the lateral and vertical distribution of petroleum hydrocarbon-impacted soil near the eastern boundary of the property(Figure 4) 3 3 ANALYTICAL RESULTS OF GRAB GROUND WATER SAMPLE TPH-g was detected in grab ground water sample P1-W at a concentration of 58,000 micrograms per liter (gg/1) Benzene, ethylbenzene and total xylenes were detected at concentrations of 53 gg/l, 1,200µg/l and 11,290 gg/l,respectively Analytical results of ground water samples are summarized in Tables 4 and 5 A copy of the laboratory report(CTEL Laboratory ID 0403-088-8) is included in Appendix D 3 4 GROUND WATER GRADIENT AND FLOW DIRECTION For the March 2004 ground water monitoring event,the elevation of ground water in each well was calculated by subtracting the depth to ground water from the surveyed casing elevation (Table 3) Depths to ground water ranged from 13 74 feet to 14 62 feet below the tops of the well casings Ground water elevations at the site ranged from 3 41 feet above mean sea level (MSL) in MW-7 to ' 3 92 feet above MSL in MW-2 Ground water at the site was inferred to flow generally toward the west-southwest (Figure 5) with an hydraulic gradient of approximately 0 003 ft/ft I35 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in ground water samples collected from monitoring wells MW-1 and MW-5 at concentrations of 7,800µg/l and 120 gg/l,respectively Benzene was detected 1n samples MW-1 and MW-5 at concentrations of 280 gg/l and 8 1 gg/l, respectively Toluene, ethylbenzene and total xylenes were detected in sample MW-1 at concentrations of 77 gg/l, 430 gg/l and 3,300 gg/l, respectively TPH-g and BTEX constituents were not detected in samples collected from wells MW- 2 through MW-4 and MW-6 through MW-8 Utilizing EPA Method 8260B, MTBE was detected in the ground water sample collected from MW-5 at a concentration of 65 gg/l Fuel additives were not detected above laboratory reporting limits in ground water samples collected from monitoring wells MW-1 through MW-4 and MW-6 . through MW-8 Advanced GeoEnwronmental,Inc