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Adk Page 2 of 2 <br />Cc: Wochnick, Michael <br />Subject: RE: Design of LFG migration Monitoring Wells, Foothill and North County Landfills <br />Hello Robert and Natalia: I have reviewed the attached submittal by Mike Carroll for the <br />Foothill and North County Landfills. Here is what I suggest based on my review of the <br />submittal: <br />1. LFG monitoring probes should be installed to the depth of fill at closure; however, the <br />operator needs to make sure that the existing depth of fill will be monitored. <br />2. The typical monitoring well included with the submittal (sheet 3 of 7) does not appear to <br />show the adequate 5 feet of bentonite seal above the screened section of shallow probe. <br />3. Screen depth for each probe within a well must be tabulated on the well schedule for <br />each landfill. <br />I suggest the operator to provide the LEA and CIWMB with adequate time prior to start of such <br />activities in the field so that we could be present during the drilling activities and the installation <br />of the probes. <br />From: Michael Carroll [mailto:mcarroll@sjgov.org] <br />Sent: Friday, May 16, 2008 7:38 AM <br />To: Robert McClellon [EH] <br />Cc: Yekta, Gino; Wochnick, Michael <br />Subject: Design of LFG migration Monitoring Wells, Foothill and North County Landfills <br />Good morning Robert, <br />Attached is a letter with attached figures addressing the questions about the design of the LFG monitoring <br />wells, as promised. <br />Please call with any questions. <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 />7/15/2008 <br />