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Page 1 of 1 <br /> Natalia Subbotnikova [EH] <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 SJC 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 /> 2/6/2012 <br />