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Page 1 of 1 <br /> Natalia Subbotnikova ] <br /> From: Robert McClellon [EH] <br /> Sent: Tuesday, February 07, 2012 8:09 AM <br /> To: 'Michael Carroll' <br /> Cc: Natalia Subbotnikova[EH] <br /> Subject: Gas Probe Modifications <br /> Mike here are comments from Calrecycle staff: <br /> Hello Natalia: Thank you for forwarding the proposed revision to County landfills gas compliance wells. We do <br /> understand the Operator would like to reduce their purge time by inserting polyethylene tubes inside the existing <br /> PVC pipes. Based on Calrecycle's landfill gas monitoring procedures,we have recommended against purging <br /> the gas probes and have recommended readings once steady state has been achieved. Purging might actually <br /> defeat the purpose of true gas monitoring since by purging, gas that might have had the potential to migrate and <br /> accumulate within the probes will be purged. Our experience with polyethylene tubing is that they become brittle <br /> and break easily and there may not be a way to tell the condition of such plastic tubing once installed within the <br /> PVC. However, if the operator wants to install the plastic tubing, they should provide assurance that installing the <br /> plastic tubing will not defeat the purpose of gas monitoring and that it will not compromise the integrity of <br /> monitoring. <br /> Mike please address the comments so that we can get back to Calrecycle. Thanks Robert <br /> ')/7/2012 <br />