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Landfill Gas Migration Monitoring Well Installation Report October 2009 <br /> Foothill Landfill Project No.03160203 <br /> overlapped the backfilled bentonite seals that separate the gravel pack intervals. <br /> In each instance where sand layers were encountered in proposed bentonite seal <br /> intervals, the Vector inspector first notified Public Works field division and EHD <br /> inspectors. The perforation intervals/gravel pack and bentonite plug depths for <br /> Wells SG-103, SG-109, SG-120 and SG-121 were modified from the plans and <br /> specifications to avoid blocking of sand lenses by the bentonite plugs as required <br /> by CCR Title 27 Section 20923 a (2). All modified probe dimensions were <br /> approved in the field by EHD inspectors. <br /> Vector Engineering, Inc. - 143E Spring Hill Drive•Grass Valley, CA 95945•(530)272-2448 <br /> 5 <br />