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B. Abandoned boreholes in soil: place cement slurry. The cement slurry seal shall <br />consist of a mixture of Portland cement with not more than seven gallons of clean <br />water per 94 -pound sack (one cubic foot) of cement. <br />IV. Trench Beneath Closure Barrier <br />A. Restoring the barrier layer to the acceptance of regulatory agencies is of the essence. <br />Place powdered bentonite and GCL as shown. <br />B. Contractor shall place GCL and associated barrier materials in the presence of the <br />Engineer and EHD staff. Call for inspection of barrier replacement a minimum 24 <br />hours prior to placement. <br />V. Additional Work <br />A. Preparation of the site for drill rig access and set-up may require additional work by <br />the Contractor. The scope of this additional work will be determined by the Engineer <br />in consultation with the Contractor. <br />B. Submit proposal for additional work as requested by the Engineer. Proceed after <br />approval of that proposal. <br />On- Call LFG System Maintenance Contractor 10 <br />Sar Joaquin County Purchasing Department <br />