Laserfiche WebLink
ameO <br />4.1.5 Permeability Tests <br />AMEC conducted permeability tests of SLF. AMEC conducted three (3) permeability tests of <br />re- compacted samples of SLF. The testing frequency (approximately one test per 158 cubic <br />yards) exceeded the minimum specified testing frequency of one test per 4,000 cubic yards. <br />Testing was performed with a flexible -wall permeameter, during material processing, with <br />back - pressure saturation and a constant rate of flow (ASTM D5084, Method D). The fill was <br />re- compacted to 95 percent of the standard Proctor (ASTM D698 -07) maximum dry density <br />at the optimum moisture content (as determined from oven -dried samples). Laboratory tests <br />yielded coefficients of permeability for the CQA samples from 2.5 x 10 -7 cm /sec to <br />7.9 x 10 -8 cm /sec, all of which are less than the specified maximum permeability of <br />1 x 10 -6 cm /sec. The permeability test results for the SLF met project specifications and are <br />presented in Appendix H.3 and summarized in Table 6. <br />4.2 Field Testing and Monitoring <br />AMEC observed earthworks fill operations in the Phase 5 Berm Modification to verify, when <br />necessary, lift thickness, adequate compaction, and acceptable moisture conditions. Holes <br />made in the fill during testing were backfilled and tamped with fine bentonite materials. <br />AMEC standardized nuclear gauges at the start of each day's work according to <br />ASTM D2922. <br />4.2.1 Subgrade Preparation <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 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 <br />14 <br />