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• A minimum of 12 inches of compacted SLF overlain by a layer of 80 -mil <br />single -sided textured linear low density polyethylene (LLDPE) <br />geomembrane (textured side down); and <br />• A minimum 2 -foot thickness of DCF installed over the primary <br />geomembrane. <br />The installation of the primary geomembrane layer in the Process Solution Enhancement <br />System was performed in May 2012. Lone Star installed approximately 140,525 square feet <br />(neat line) of 80 -mil single -sided textured LLDPE (textured side down) geomembrane to the <br />project specifications. <br />Geomembrane installation for the Process Solution Enhancement System is discussed <br />further in Section 3.1. Ames anchored geomembrane at the limits of the Process Solution <br />Enhancement System, with the dimensions of each trench a minimum of 3 feet deep by <br />1 foot wide. Ames backfilled the anchor trenches with suitable anchor trench backfill <br />material, or with SLF material where future primary geomembrane liner will cover the anchor <br />trench. Ames placed anchor trench backfill in maximum 12- inch -thick compacted lifts. <br />Anchor trench backfill was compacted with a hand - operated 500 -pound vibratory compactor <br />and "Jumping Jack" compactors to project specifications. <br />2.7 Drain Cover Fill <br />Ames began placing DCF in the Process Solution Enhancement System in May 2012 and <br />completed placement in July 2012. Ames processed DCF from January 2012 through <br />February 2012 by screening crushed Cresson Overburden over a vibrating one and <br />one -half inch (1.5 -inch) screen to remove oversize material from the borrow source. Ames <br />placed approximately 10,808 cubic yards of DCF (neat line) in the Process Solution <br />Enhancement System to project specifications. DCF was placed in a minimum 2 -foot thick <br />lift over the geomembrane and in a 5 -foot thick lift where Caterpillar 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 />AMEC Environment & Infrastructure, Inc. <br />2000 S Colorado Blvd 2 -1000 <br />Denver, CO 80222 <br />Tel 303 - 935 -6505 <br />Fax 303 - 935 -6575 <br />ame0 <br />www amec com 11 <br />