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Mr. Todd Del Frate -2- <br /> INSTALLATION OF NEW LANDFILL GAS EXTRACTION WELLS AT <br /> CORRAL HOLLOW SANITARY LANDFILL <br /> 2. Lateral Trench of EW-40, EW-41 and EW-42 LFG Extraction Wells <br /> The laterals for LFG extraction wells EW-40, EW-41, and EW-42 were partially <br /> installed in the vegetative layer and in a deeper trench penetrating the barrier layer at <br /> the toe of the landfill's slope. The laterals were installed in a deeper trench at the toe <br /> of the landfill's slope to cross under the existing drainage ditch and connect to the well <br /> heads (Photo 2 and Figure 3). <br /> The disturbed barrier layer in the lateral trench of EW-40, EW-41 and EW-42 LFG <br /> extraction wells was restored by placing a minimum of four inches of bentonite at the <br /> barrier layer elevation (Photo 4 and 5). Bentonite was also placed in the trenches <br /> under the drainage ditch to minimize infiltration. <br /> 3. LFG Extraction Well Supplemental Collection Points <br /> All new LFG extraction well laterals included a supplemental collection point extending <br /> two feet into refuse. Four inches of bentonite was placed at the barrier layer elevation <br /> in the trench of all wells supplemental collection point (Photo 6). <br /> Well Operational Status <br /> The new LFG extraction wells are currently under 0.25 inches water column vacuum from the <br /> LFG collection system. Vacuum on the new LFG extraction wells will be increased based on <br /> future ground water data. <br /> I certify under penalty of law that I have personally examined and I am familiar with the <br /> information submitted in this document and all attachments and that, based on my inquiry of <br /> those individuals immediately responsible for obtaining the information, I believe that the <br /> information is true, accurate, and complete. If you have any questions, or if you wish further <br /> information, please call me at (209) 468-8504. <br /> Sincerely, <br /> 816 <br /> W. MICHAEL CARROLL, PE * P. 3/3t/1 <br /> 0 <br /> Senior Civil Engineer CIV\V P <br /> Of CAU <br /> WMC:JC:sc <br /> NA1 Corral Hollow\LFG Collect System\LFG Ext Well Inst 08\TDelFrate01_Inst of new LFG Wells 08(revised).doc <br /> Enclosure <br /> c: Robert McClellon, San Joaquin County Environmental Health Department <br /> Gino Yetka, Closure and Technical Services, CIWMB <br /> LA 21125B <br />