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ameO <br />Ames began placing SLF in the 2010 Phase 5 VLF in May 2010 and completed SLF <br />placement in October 2010. SLF was compacted to a minimum thickness of 12 inches by a <br />smooth-drum vibratory compactor. AMEC observed SLF depth verification tests performed <br />by Ames to confirm appropriate fill depth. Any areas that were found to be deficient in <br />thickness were reworked and retested until the area met specifications. The SLF depth <br />verification is discussed in Section 4.2.6.3. SLF was moisture-conditioned and compacted <br />as needed to meet project specifications. The minimum SLF density was 95 percent of the <br />maximum dry density at 2 percent dry of optimum to 3 percent wet of optimum moisture <br />content as determined by standard Proctor tests performed by AMEC. Areas of the SLF that <br />initially failed to meet the moisture-density requirement were moisture-conditioned, if <br />necessary, re-compacted, and re-tested to achieve the required compaction. <br />Prior to geomembrane deployment on the SLF, Ames proof-rolled, compacted, and <br />hand-worked the fill surface to be free of desiccation cracks and abrupt grade changes. <br />AMEC then inspected the surface. Sharp or angular stones greater than 0.75 inches in <br />diameter were removed from the finished surface. AMEC approved fill surfaces prior to <br />release to Lone Star for deployment. AMEC and Lone Star provided formal subgrade <br />approval prior to geomembrane deployment. AMEC and Lone Star's subgrade acceptance <br />forms are presented in Appendix G. <br />2.7 Bedding Fill <br />Bedding Fill was not required to be used during the construction of the 2010 Phase 5 VLF. <br />• <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 15