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4.2 Field Testing and Monitoring <br />4.2.1 Subgrade Preparation <br />4.2.2 Site Grading <br />ame0 <br />07) maximum dry density at the optimum moisture content (as determined from oven -dried <br />samples). Laboratory tests yielded coefficients of permeability for the CQA samples from <br />8.6 x 10 - ' cm /sec to 1.2 x 10 -8 cm /sec, all of which are less than the specified maximum <br />permeability of 1 x 10 -6 cm /sec. The permeability test results for the SLF met project <br />specifications and are presented in Appendix H.3 and summarized in Table 7. <br />AMEC observed earthworks fill operations in the 2011 Phase 5 VLF OSA 3 Portion to <br />verify, when necessary, lift thickness, adequate compaction, and acceptable moisture <br />conditions. Holes made in the fill during testing were backfilled and tamped with fine <br />bentonite materials. AMEC standardized nuclear gauges at the start of each day's work <br />according to ASTM D2922. <br />AMEC monitored subgrade preparation, including verification that Ames compacted the <br />subgrade with a smooth drum vibratory roller (SDVR) compactor. AMEC verified that Ames <br />removed protruding rocks from the subgrade surface prior to SLF placement. AMEC verified <br />that the subgrade surface was moisture conditioned, smooth, and unyielding prior to SLF <br />placement. <br />AMEC monitored site grading. In areas where the SF contained less than 30 percent by <br />weight larger than 3/4-inch particle size, nuclear density tests were conducted to verify <br />density and moisture content. A total of 68 moisture - density tests were conducted on <br />128,400 cubic yards, resulting in a testing frequency of one test per 1,888 cubic yards, <br />exceeding the minimum testing frequency of one test per 2,000 cubic yards. <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 corn 21 <br />