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0 Page 1 of 1 <br />From: Yekta, Gino [Gino.Yekta@CalRecycle.ca.gov] <br />Sent: Monday, February 06, 2012 12:52 PM <br />To: Natalia Subbotnikova [EH] <br />Cc: Wochnick, Michael; Robert McClellon [EH]; Jan, Peter <br />Subject: Revision to LFG Compliance Wells <br />Hello Natalia: Thank you for forwarding the proposed revision to County landfills gas <br />compliance wells. We do understand the Operator would like to reduce their purge time <br />by inserting polyethylene tubes inside the existing PVC pipes. Based on Calrecycle's <br />landfill gas monitoring procedures, we have recommended against purging the gas probes <br />and have recommended readings once steady state has been achieved. Purging might <br />actually defeat the purpose of true gas monitoring since by purging, gas that might <br />have had the potential to migrate and accumulate within the probes will be purged. Our <br />experience with polyethylene tubing is that they become brittle and break easily and <br />there may not be a way to tell the condition of such plastic tubing once installed <br />within the PVC. However, if the operator wants to install the plastic tubing, they <br />should provide assurance that installing the plastic tubing will not defeat the purpose <br />of gas monitoring and that it will not compromise the integrity of monitoring. Please <br />call (916-341-6354) or e-mail me if you have any questions. Thanks...............Gino <br />From: Natalia Subbotnikova [EH] [mailto:nsubbotnikova@sjcehd.com] <br />Sent: Tuesday, January 31, 2012 8:33 AM <br />To: Yekta, Gino <br />Cc: Robert McClellon [EH] <br />Subject: Revision to LFG migration monitoring plan for improvement of perimeter <br />monitoring at SIC owned landfills <br />Good morning Gino, <br />Here's the Revision to LFG Migration Monitoring Plan for improvement of perimeter <br />monitoring at San Joaquin County -owned landfills. <br />Please, let us know if you have any comments. <br />Thanks, <br />Natalia Subbotnikova, Senior REHS <br />San Joaquin County Environmental Health Department 600 E Main Street Stockton, CA 95202 <br />(209) 468-0338 <br />nsubbotnikova@sjcehd.com <br />� i, <br />