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2.9 Drain Cover Fill <br />ame0 <br />Ames began placing DCF in the 2011 Phase 5 VLF OSA 3 Portion in June 2011 and <br />completed placement in November 2011. Ames processed DCF from June 2011 through <br />November 2011 by screening crushed Cresson Ore over a vibrating one and one -half inch <br />(1.5 -inch) screen to remove oversize material from the borrow source. Ames placed <br />approximately 218,842 cubic yards of DCF (neat line) in the 2011 Phase 5 VLF OSA 3rd <br />Portion to project specifications. DCF was placed in a minimum 2 -foot thick lift over the <br />geomembrane and in a 5 -foot thick lift where Caterpillar 735 and 740 haul trucks travelled <br />over the geomembrane. During fill placement, PVC grade markers were placed at grade <br />breaks and on a maximum 50 -foot by 50 -foot grid. After DCF placement, PVC grade markers <br />were removed, and Ames performed any additional grading required. Ames placed DCF in an <br />uphill direction on any slopes steeper than 4H:1 V. <br />AMEC Earth & Environmental, Inc. <br />2000 S Colorado Blvd 2 -1000 <br />Denver, CO 80222 <br />Tel 303 - 935 -6505 <br />Fax 303 - 935 -6575 www amec corn 13 <br />