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01 March 1999 AGE-NC Project No. 95-0103 Page 4of8 Benzene was detected in wells MW-1, MW-3, MW-4 and vapor well VE-6 at concentrations of 43 µg/l, 140 µg11, 1,100 µg/l and 510 µg/1, respectively. _ Benzene was not detected in wells MW-2, MW-5, MW-6 and MW-7. Other BTE&X compounds were detected in wells MW-1, MW-3 , MW-4 and vapor well VE-6 at concentrations as high as 950 µg11. Petroleum hydrocarbons were not detected in the samples collected from wells MW-2,MW-5,MW- 6, and the eastern most well, MW-7. MTBE was detected in the samples collected from wells MW-1, MW-3 and vapor well VE-6 at concentrations of 33 ugll, 1.6 µg/1 and 3.7 µg11, respectively; DIPS was detected in samples collected from wells MW-3, MW-5 and vapor well VE-6 at concentrations of 26 µg/l, 28 µg/l and 41 µg/1, respectively; TBA was detected in the samples collected from wells MW-1 and vapor well VE-6 at concentrations of 120 µg11 and 480 4g11, respectively. Neither ETBE nor TAME were detected in samples collected from the site. The analytical results of current and previous samples are summarized in Table 2 and Table 3. The w laboratory report (MAI sample ID Numbers 01143 through 01150), quality assurance and quality control (QA/QC) data and chain-of-custody form are included in Appendix B. 3.2.2. Bio-Enumeration and Physicochemical Analyses Water samples from wells MW-3, MW-4 and vapor well VE-6 were analyzed for bio-enumeration and physicochemical characterization by A. Keith Kaufman, M.S. All three water samples were found to have concentrations of inorganic components sufficient to support a microfauna for bioremediation. Nitrogen, potassium and phosphates were at sufficient levels to support a microfauna for bioremediation for undetermined time period. The sample set contain two samples from on site wells with low to moderate microbiological populations as biodegraders (wells MW-4 and VE-6), while the off-site well sample contained no biodegraders. Wells MW-4 and vapor well VE-6 contained select biodegrading populations of bacteria at concentrations of 88% and 14 %, respectively. Hydrocarbon concentrations may not be high enough to stimulate the selective biodegrader populations to accelerate natural attenuation. Under the present circumstances, natural attenuation by bioremediation is not likely to occur off site with no biogegraders and low oxygen content. The laboratory report (A. Keith Kaufman [Chapin Brothers)) and chain-of-custody form are included in Appendix C. Advanced GwEnvironmental,Inc.