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October 2004 -12- 043 -2170 <br />material prior to pug milling and stockpiling. A stockpile of processed SLF material remaining from <br />the 2003 construction season was also consumed and placed during the course of construction of the <br />Phase We OSA. <br />Ames began placing SLF in the Phase We OSA in May 2004 and completed SLF placement in <br />September 2004. SLF was compacted to a minimum thickness of 12 inches by a smooth -drum <br />vibratory compactor. Golder observed SLF depth verification tests performed by Ames to confirm <br />appropriate fill depth. Any areas that were found to be deficient in thickness were reworked and <br />retested until the area met specifications. The SLF depth verification is discussed in Section 4.2.6.3. <br />SLF was moisture - conditioned and compacted as needed to meet project specifications. The <br />minimum SLF density was 95 percent of the maximum dry density at plus or minus 3 percent of <br />optimum for bentonite amended SLF and at 3 percent dry of optimum for non - amended SLF, as <br />determined by standard Proctor tests performed by Golder. Areas of the SLF that initially failed to <br />meet the density or moisture requirements were moisture - conditioned, if necessary, and re- compacted <br />to achieve the required compaction. <br />Prior to geomembrane deployment on the SLF, Ames proof - rolled, compacted, and hand- worked the <br />fill surface to be free of desiccation cracks and abrupt grade changes. Golder then inspected the <br />surface. Sharp or angular stones greater than 0.75 inches in diameter were removed from the finished <br />surface. Golder approved the fill surface prior to release to Poly -Flex. Poly -Flex provided formal <br />subgrade approval prior to geomembrane deployment. Poly- Flex's subgrade acceptance forms are <br />presented in Appendix G. <br />2.7 Ore Storage Area Composite Liner System <br />The composite liner system in the Ore Storage Area (OSA) includes the following, as detailed in IFC <br />Drawing 17: <br />Minimum of 12 inches of compacted SLF overlain by 80 -mil single -sided textured <br />Linear Low- Density Polyethylene ( LLDPE) geomembrane (textured side down). <br />Poly -Flex installed approximately 2,685,000 square feet of 80 -mil single -sided textured LLDPE <br />geomembrane in the OSA (cumulative area from deployment bgs). The 2,685,000 square foot area of <br />0 <br />L-waunOk$M�Cp,gweeIVC-tO M 12170.040&I MCertrnrvo+oe Golder Associates <br />