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August 2002 -15- 003 -2203 <br />in 2.5 Subgrade Preparation <br />Prior to SLF placement, Ames moisture conditioned and compacted the entire surface of the <br />Phase IVa Area with a smooth drum vibratory compactor. The quality of the surface was then <br />maintained until SLF was placed. <br />2.6 Soil Liner Fill <br />Based on neat -line survey, Ames placed and compacted approximately 52,960 cubic yards of <br />SLF in the Phase Wa Area. Record Drawing No. 3 in Appendix A shows the top of SLF. <br />Ames processed the SLF for the Phase IVa construction, beginning in April 2001 and finished <br />in February 2002. Ames screened the borrow material through a custom designed rotary mill <br />and screen to remove oversized material from the SLF. <br />• Ames began placing SLF in the Phase IVa Area in April 2002 and completed SLF placement in <br />June 2002. 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 <br />confirm appropriate fill depth. Any areas that were found to be deficient in thickness were <br />reworked and retested until the area met specifications. The SLF depth verification is discussed <br />in Section 4.2.6.3. SLF was moisture- conditioned and compacted as needed to meet project <br />specifications. The minimum SLF density was 95 percent of the maximum dry density at <br />3 percent dry of optimum to optimum moisture content as determined by standard Proctor tests <br />performed by Golder. Areas of the SLF that initially failed to meet the density requirement <br />were moisture - conditioned, if necessary, and re- compacted to achieve the required compaction. <br />There was an area of approximately 70,000 square feet that did not achieve acceptable SLF <br />moisture content, compaction, and gradation. The SLF was replaced with SLF meeting <br />specifications. <br />y.vo =03W4Wr-enRepoSO M2203.0",04740 u.aoo Golder Associates <br />