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2.6 Process Solution Enhancement System Composite Liner System <br />ameci <br />Ames processed the SLF for the Process Solution Enhancement System construction from <br />January 2009 through August 2010. Ames worked the borrow material through a custom - <br />designed rotary mill and screen to remove oversized material from the SLF and to uniformly <br />condition the material prior to stockpiling. <br />Ames placed SLF in the Process Solution Enhancement System in May 2012 and June <br />2012. SLF was compacted to a minimum thickness of 12 inches by a smooth -drum <br />vibratory compactor. AMEC observed SLF depth verification tests performed by Ames to <br />confirm appropriate fill depth. Any areas that were found to be deficient in thickness were <br />reworked and retested until the area met project specifications. The SLF depth verification <br />is discussed in Section 4.2.3.3. SLF was moisture - conditioned and compacted as needed to <br />meet project specifications. The minimum SLF density was 95 percent of the maximum dry <br />density at 2 percent dry of optimum moisture content to 3 percent wet of optimum moisture <br />content, as determined by standard Proctor tests performed by AMEC. Areas of the SLF <br />that initially failed to meet the moisture - density requirement were moisture - conditioned, if <br />necessary, re- compacted, and re- tested to achieve the required compaction to project <br />specifications. <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 geomembrane deployment. AMEC and Lone Star provided formal <br />subgrade approval prior to geomembrane deployment. Subgrade acceptance forms are <br />presented in Appendix G. <br />The Process Solution Enhancement System is comprised of a primary composite liner, as <br />follows: <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 www amec.com 10 <br />