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' 29 November 2001 • AGE-NC Project No 95-0111 ' Page 3 of 4 s ' The ground water flow direction Is Inferred to be towards the north-northwest under an average hydraulic gradient of 0 008 feet/feet Figure 3 Illustrates the contoured ground water elevations ' 3 2 MICROBIOLOGICAL ACTIVITY IN GROUND WATER _ ' The general counts of heterotrophic organisms ranged from 6 1 X 105 cf i/g to 7 1 X 105 cfu/g and the selective counts ranged from 0 8 X 105 cfu/g to 1 1 X 105 cfu/g in the water samples collected from MW-1 and MW-4 Nitrates (NO3), mtntes (NO3) and ammonium (NH4) were detected in the ' samples from MW-1 and MW-4 at concentrations as high as 30 8 parts permillion(ppm),26 24 ppm and 1 419 ppm, respectively Additional nitrogen and phosphorous nutrients were detected'in the ' water samples Concentrations are summarized on Table 4 The laboratory results indicate low to moderate populations of organisms capable of gasoline and ' diesel metabolism However, nutrient concentrations are at moderate to high levels for ongoing bioremediation Microbiological and physicochemical analytical results are summarized on Table 4 The laboratory report and chain-of-custody form are Included in Appendix B 1 • 3 3 ANALYTICAL RESULTS OF GROUND WATER SAMPLES ' TPH-g and BTEX compounds were not detected at or above laboratory reporting limits in the ground water samples TPH-d was detected In the ground water samples collected from wells MW-4 and ' MW-5 at concentrations of 2,700 gg/1 and 1;100 gg/l, respectively MTBE was detected by EPA Method 8020 in the samples collected from MW-1 and MW-8 at concentrations of 17 }ig/l and 6 1 µg/l, respectively MTBE was confirmed in the ground water samples collected from MW-1 and MW-8 at concentrations of 14µg/1 and 4 5 gg/l,respectively and detected in the ground water samples collected from MW-2 and MW-7 at concentrations of 1 0 gg/l, ' and l 7µg/l,respectively by EPA method 8260 No other fuel oxygenated compounds were detected at or above laboratory reporting limits in the ground water samples analyzed IAnalytical results of the ground water samples are summarized in Tables 2 and 3 The laboratory reports (MAI Laboratory Sample No 78805 through 78812), quality assurance and quality control ' report and cham-of-custody forms are included in Appendix C ' 4.0. SUMMARY AND CONCLUSIONS Based on the findings from this Investigation, AGE concludes ' Advanced GeoEnvironmental Inc