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which continue to grow, we do not consider this to be reasonable. <br /> I have also looked at your observation that when low levels of contamination do occur, they <br /> occur during the lowest water level period. For you reference, I have included some very rough <br /> graphs which show the relationship between time and occurrences of benzene in MW-1- Also <br /> included is a graph which shows the relationship between the concentration of benzene and <br /> time. It is interesting that the concentrations, when pr sent show an approximate logarithmic <br /> decrease with time. I believe this decrease is the resull of the natural biodegredation process. <br /> Please note that during the installation of MW-6, residual contamination was encountered at 60 <br /> feet and 74 feet. There have been two years of ND le els of benzene in this well which has <br /> undergone two hydrologic cycles. Again, I believe that natural biodegredation has "cleaned" the <br /> - <br /> :groundwater. <br /> Both KEI and I would be happy to discuss our interpretation of these results and welcome your <br /> comments. Please give me a call if I can be of any hell). <br /> Since ely yours, <br /> �� <br /> David B. De Witt <br /> Environmental Geologist <br /> Attachments <br /> cc: R. D. Sisk <br /> Robert Kezerian, KEI <br />