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Page 2 of 2 <br /> Landfill(Figure attached). Three or four wells were originally proposed to mitigate the VOC impact at shallow aquifer <br /> monitoring well MW-5. However,our recent groundwater analysis indicates an increase in carbonate at wells MW-4 and- <br /> 5,which could be due to the effect of the carbon dioxide component of landfill gas. Such an effect is best corrected by <br /> increasing the collection of landfill gas where it is likely to affect the shallow aquifer. The three previously proposed wells <br /> would accomplish this north of monitoring well SB-1 where groundwater monitored by MW-5 might be affected,and the <br /> two additional wells would improve LFG collection south of SB-1 where the groundwater monitored by MW-4 might be <br /> affected. <br /> I recognize that this is short notice, but this new information was revealed in the analysis for the groundwater <br /> monitoring report that is now on its way to Todd at the RWQCB. <br /> I would like to move quickly on this to take advantage of our upcoming construction of the three original wells, <br /> now scheduled for November 10. We can ask our contractor to do this additional work under this PO. If we <br /> cannot include the new wells on this PO,it will probably be next year before these wells could be installed. <br /> The new wells would conform to the design and work plan presently approved for this work. Robert McClellon <br /> has said that the new wells could be added to the Work Plan by addendum. <br /> I await Gino's thoughts on this. Todd has told us that it is OK with him to install these new wells (thanks Todd). <br /> Best regards, <br /> Mike Carroll <br /> W. Michael Carroll, PE <br /> Senior Civil Engineer, Solid Waste Division <br /> 1810 E. Hazelton Ave. <br /> Stockton, CA 95205 <br /> Voice: 209-468-8504 <br /> Fax: 209-468-3078 <br /> 1/27/2009 <br />