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Mr. Robert McClellon <br /> December 8, 2010 <br /> Page 4 <br /> the event that the groundwater table rises to historic levels however, the current groundwater <br /> level is far below historic high water table levels and it is unlikely that the historic high <br /> groundwater levels will reoccur in the future. <br /> Materials will be installed by qualified installation contractors, will be inspected by <br /> construction quality assurance monitors, and will be certified by a California-registered <br /> engineer. The installation of the composite liner system will create a barrier to LFG <br /> migration. In addition, within five (5) years of placing waste in the new cell, the existing <br /> LFG collection and control system (GCCS) will be expanded into the new cell to capture <br /> LFG generated in the landfill expansion and prevent LFG pressure fronts that could lead to <br /> migration. The composite liner system in conjunction with a properly operated and <br /> maintained GCCS will provide control of LFG and limit the potential risk of LFG migration <br /> from the new 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 /> In the next few months, Forward plans to demonstrate that the improvements to the current <br /> GCCS will control the source of the historical LFG migration at the existing probes before <br /> they are abandoned as part of the Landfill expansion. Barring unexpected conditions, the <br /> ongoing GCCS improvements will demonstrate that given the site geology, LFG probes at <br /> any setback from the waste limit are appropriate for monitoring LFG migration when using a <br /> liner system and a properly operated and maintained 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. Andrew Romolo, P.G. <br /> Senior Manager Principal Geologist <br /> (Terraphase Engineering) <br /> cc: Don Litchfield, Forward, Inc. <br /> Ross Atkinson,RWQCB <br /> Kevin Taylor, Scott Walker, Gino Yekta, CalRecycle <br />