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ameO <br />2.2 Site Grading <br />Prior to SF placement, Ames conditioned and compacted the subgrade surface of the fill <br />area. AMEC monitored the preparation of the subgrade and verified that it met project <br />specifications. <br />Ames graded existing slopes and placed SF so that final slopes were no steeper than 2H:1V <br />(horizontal: vertical). In native ground, the in -situ material was scarified to a depth of <br />approximately 6 inches. SF was compacted with a minimum of four passes by a smooth <br />drum vibratory compactor to project specifications. <br />In the 2009 and 2010 construction seasons, Ames placed approximately 2,513,001 cubic <br />yards of SF for site grading in and around the Phase 5 VLF. Fill placement was performed <br />within the 2011 Phase 5 VLF OSA 2nd Portion during this time. <br />2.3 Leak Detection System <br />Ames constructed approximately 2,912 linear feet of LDT in the 2011 Phase 5 VLF OSA 2nd <br />Portion, at the location shown in Record Drawing No. 2 of 5. <br />IFC Drawing A280, Detail J, shows a typical Leak Detection Trench section. Ames <br />excavated the trench to a minimum 1 -foot by 1 -foot cross - sectional dimension, and a <br />minimum one percent grade. Ames placed geosynthetics, one 4 -inch diameter perforated <br />corrugated polyethylene (PCPE) pipe, and LDF in the trench. Ames placed approximately <br />108 cubic yards of LDF, 14,560 square feet of 40 -mil smooth Low Linear Density <br />Polyethylene (LLDPE) geomembrane, 11,648 square feet of 12 -ounce non -woven <br />geotextile, and 2,912 linear feet of PCPE in the LDT. The LDT geosynthetics installation is <br />discussed further in Section 3.2. <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 com <br />J <br />