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Natalia Subbotnikova [EH] <br />From: Robert McClellon [EH] <br />Sent: Thursday, October 30, 2008 3:55 PM <br />To: Natalia Subbotnikova [EH] <br />Subject: FW: Additional LFG wells at Corral Hollow Landfill <br />Attachments: CH LFG Well Inst 08 -Revised Fig 2.pdf <br />From: Michael Carroll [mailto:mcarroll@sjgov.org] <br />Sent: Thursday, October 30, 2008 3:28 PM <br />To: Todd Del Frate (TDelFrate@waterboards.ca.gov); gyekta@ciwmb.ca.gov <br />Cc: Robert McClellon [EH] <br />Subject: Additional LFG wells at Corral Hollow Landfill <br />Todd and Gino, <br />Page 1 of 1 <br />Per my voicemail of this morning, we would like to install two additional LFG collection wells at the Corral Hollow <br />Landfill (Figure attached). Three or four wells were originally proposed to mitigate the VOC impact at shallow <br />aquifer monitoring well MW -5. However, our recent groundwater analysis indicates an increase in carbonate at <br />wells MW -4 and -5, which could be due to the effect of the carbon dioxide component of landfill gas. Such an <br />effect is best corrected by increasing the collection of landfill gas where it is likely to affect the shallow aquifer. <br />The three previously proposed wells would accomplish this north of monitoring well SB -1 where groundwater <br />monitored by MW -5 might be affected, and the two additional wells would improve LFG collection south of SB -1 <br />where the groundwater monitored by MW -4 might be 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 />10/30/2008 <br />