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. % Page 1 of 2 <br />Natalia Subbotnikova [EH] <br />From: Michael Carroll [mcarroll@sjgov.org] <br />Sent: Thursday, May 22, 2008 9:40 AM <br />To: Robert McClellon [EH] <br />Cc: Natalia Subbotnikova [EH]; Joyesh Chandra; gyekta@ciwmb.ca.gov <br />Subject: RE: Design of LFG migration Monitoring Wells, Foothill and North County Landfills <br />Thanks for forwarding the comments. Please see my inserts below. <br />=- <br />W. Michael <br />R <br />Carroll, <br />r E. Hazelton <br />Stockton, t <br />Voice:0• <br />• <br />-468-3078 <br />-----Original Message ----- <br />From: Robert McClellon [EH] [mailto:RMcClellon@sjcehd.com] <br />Sent: Wednesday, May 21, 2008 2:03 PM <br />To: Michael Carroll <br />Cc: Natalia Subbotnikova [EH] <br />Subject: FW: Design of LFG migration Monitoring Wells, Foothill and North County Landfills <br />have a., questions. . R••_..,. <br />From: Yekta, Gino [mailto:GYekta@CIWMB.ca.gov] <br />Sent: Wednesday, May 21, 2008 1:57 PM <br />To: Robert McClellon [EH]; Natalia Subbotnikova [EH] <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 />deep probe will extend to the proposed elevation of the base of the refuse at closure. <br />2. The typical monitoring well included with the submittal (sheet 3 of 7) does not appear to show the <br />adequate 5 feet of bentonite seal above the screened section of shallow probe. <br />We will modify our drawings to provide 5 feet bentonite. <br />3. I suggest the operator to provide the LEA and CIWMB with adequate time prior to start of such <br />5/22/2008 <br />