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October 2001 -9- 003-2182.004 <br /> 2.4 Soil Liner Fill <br /> Based on neat-line survey, Ames placed and compacted approximately 6,075 cubic yards of <br /> Soil Liner Fill on the External Pond foundation. Record Drawing No. 2 in Appendix A shows <br /> the top of Soil Liner Fill As-Built. <br /> Ames processed the Soil Liner Fill for the External Pond, beginning in February 2001 and <br /> finishing in May 2001. Ames screened the borrow material through a 2-inch rotary screen to <br /> remove oversized material from the Soil Liner Fill. <br /> Ames began placing Soil Liner Fill in the External Pond in May 2001, and completed Soil Liner <br /> Fill placement in September 2001. Soil Liner Fill was compacted to a minimum thickness of <br /> 12 inches by a smooth-drum vibratory compactor. Golder observed Soil Liner Fill depth <br /> verification tests performed by Ames to confirm appropriate fill depth. Any areas that were <br /> found to be deficient in thickness were reworked and retested until the area met specifications. <br /> The Soil Liner Fill depth verification is discussed in Section 4.2.3.3. Soil Liner Fill was <br /> moisture-conditioned and compacted as needed to meet project specifications. The minimum <br /> Soil Liner Fill density was 95 percent of the maximum dry density at 3 percent dry of optimum <br /> to optimum moisture content as determined by standard Proctor tests performed by Golder. <br /> Areas of Soil Liner Fill, which initially failed to meet the density requirement, were moisture- <br /> conditioned if necessary and re-compacted to achieve the required compaction. <br /> Prior to geomembrane deployment on the Soil Liner Fill, Ames proof-rolled, compacted, and <br /> hand-worked the fill surface to be free of desiccation cracks and abrupt grade changes. Golder <br /> then inspected the surface. Sharp stones were removed. Locally,Ames placed fines stockpiled <br /> from the Cameron tailings to smooth the fill surface in areas that were observed to be rough. <br /> 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 <br /> are presented in Appendix F. <br /> I\00\2182\EXTEMAL POND"TTINAL DOC Golder Associates <br />