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A comparison of the CO2 concentrations obtained from the VE test <br /> at MW4 and MW8 may substantiate she idea that bio-activity is <br /> abating the contamination at MW4 (VE report 4/17/95-Table 1 & 2) . <br /> MW8 had relatively elevated petroleum contamination in the vapor <br /> stream and fairly high CO2 content (+10%) at the beginning of the <br /> test and the CO2 did not seem to decrease in concentration (+10%) <br /> at any time during the test . MW4 did not show any significant <br /> petroleum concentration to the vapor stream (however ground water <br /> contamination has been shown at very low levels) and yet CO2 <br /> content was relatively high (+8%) . After ' stripping' the well <br /> for approximately one hour the CO2 concentration decreased <br /> (6 . 750) , this CO2 may be the by-product of aerobic <br /> microorganisms' degradation of ?")etroleum and this observed <br /> decline in CO2 suggests that there is significantly more <br /> available to MW4 than MW8 for this activity. oxygen <br /> The effluent of the vapor stream from the VE test (after carbon <br /> cannisters) was taken and analyzed at both WEGE' s ' in-house' FID <br /> chromatograph and American Environmental Network' s lab. Methane <br /> was observed but not quantified in WEGE' s analysis of the <br /> effluent . This methane generation in the subsurface suggests <br /> that anaerobic bio-activity may also exist for degradation of <br /> petroleum hydrocarbons . <br /> CONCLUSIONS <br /> 1 . Eight monitor wells were sampled. MW1, MW2, MW3 , MW5, MW6 <br /> and MW7 showed no detectable levels of contamination. <br /> 2 . MW4 and MW8 have levels of Total Fuel Hydrocarbons as <br /> gasoline of 0 . 1 and 12 mg/L and Benzene of 2 and 2100 pg/L, <br /> respectively. <br /> 3 . The ground water flow direction is presently in a south <br /> southeasterly direction from MW1 to MW5 and south <br /> southwesterly from MW5 to MW7 . The current ground water <br /> elevation gradient between MW1 and MW7 averages 0 . 002 feet <br /> per linear foot . <br /> 4 . S1 and S2 were not sampled; these wells were dry. <br /> LIMITATIONS <br /> The discussion and conclusions presented in this report are based <br /> on the following: <br /> 1 . The observations and data collected by field personnel . <br /> 5 USA 65 June ' 95 Qtr Rpt <br />