Laserfiche WebLink
Mr. Robert McClellon <br />January 26, 2011 <br />Page 5 <br />success of this design is the GCCS. This design has been demonstrated elsewhere including <br />the unlined or clay -only lined areas of the original portions of the Forward landfill (i.e. WMUs <br />B, C, and D-87 through D-88) which contain a LFG collection system. It is our understanding <br />that probes within 50 feet of the unlined or clay -only lined areas containing a LFG collection <br />system have not shown evidence of LFG migration. These observations prove that a properly <br />installed and operating LFG collection system can control LFG migration regardless of the set- <br />back from LFG monitoring probes even in an unlined cell. <br />Conclusion <br />In summary, the new LFG migration probes will be designed in accordance with the CCR <br />Title 27 criteria. LFG migration will be controlled by the installation of a composite liner <br />system and a properly operated and maintained GCCS. <br />Recent results of probe monitoring at Forward indicate that the installation and operation of <br />new wells in the lined area and in the old Austin Road Unit have successfully cleaned up the <br />existing probes and are controlling LFG migration. Barring unexpected conditions, the <br />ongoing GCCS improvements will demonstrate that given the site geology, LFG probes <br />regardless of distance from the waste limit are appropriate for monitoring LFG migration <br />when using a properly installed and operated GCCS. <br />If you have any questions or comments, please contact me at 630-633-5822. <br />Sincerely, <br />Cornerstone Environmental Group, LLC <br />Paul Stout, P.E. <br />Senior Manager <br />Andrew Romolo, P.G. <br />Principal Geologist <br />(Terraphase Engineering) <br />cc: Don Litchfield, Forward, Inc. <br />Lochlin Caffey, Forward, Inc. <br />Ross Atkinson, RWQCB <br />Kevin Taylor, Scott Walker, Gino Yekta, CalRecycle <br />Encl. Figure 1 <br />