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Mr.`Todd Del Frate -3- <br />GAS-PERMEABLE <br />3 -GAS -PERMEABLE BARRIER OVER REFUSE AT FOOTHILL LANDFILL <br />For the repair at GX-2, however, we propose to replace the HDPE fabric with materials that <br />would meet or exceed the requirements for a closure layer under Section 21090(x)(2) <br />(Figure 2). Specifically, we would fill the excavation with compacted ("foundation") soil up to . <br />the HDPE fabric, and then place Geo -composite clay liner (GCL) and granular bentonite where <br />the HDPE fabric is now. This will provide a continuous barrier against water. <br />Please let me know your thoughts on this. We plan to begin mobilizing to extend the well head <br />as soon as we receive your response. <br />If you have any questions, please call me at (209) 468-8504. <br />Sincerely, <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:sc <br />N:\1 FoothillIM perimMonit\TDelFrate02-FixGX-2.doc <br />Attachments <br />c: Robert McClellon, Environmental Health Department <br />LA 31109 <br />