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0 <br />n <br />U <br />ameO <br />4.2.6 Soil Liner Fill <br />Field testing included monitoring of placement and preparation of SLF for geomembrane <br />deployment, testing in-place moisture and density with a nuclear gauge, and monitoring <br />depth verification. <br />4.2.6.1 Field Monitoring <br />AMEC observed SLF placement to verify lift thickness, adequate compaction, acceptable <br />moisture conditions, final compacted thickness, and suitability for geomembrane <br />deployment. AMEC identified angular particles on the fill surface, ruts, and desiccation <br />cracks, and brought these features to the attention of Ames for repair. Ames completed <br />repairs by placed fines from their SLF processing plant or from temporary piles of fine SLF <br />to smooth and re-compact the fill surface in areas that were observed to be rough or <br />inadequate, as discussed in Section 2.6. AMEC and Lone Star approved the final surface of <br />the SLF prior to geomembrane deployment. <br />4.2.6.2 Moisture-Density Test Results <br />AMEC performed a total of 139 in-place moisture-density tests of SLF. AMEC compared <br />results of the field moisture content and density tests to the Proctor dry density and optimum <br />moisture content values of material with similar gradation and plasticity characteristics. <br />Proctor dry density and optimum moisture content values for samples with greater than ten <br />percent plus three-quarter-inch material were corrected according to ASTM D4718 to <br />facilitate direct comparison to nuclear density values. The moisture-density testing <br />frequency of approximately one test per 383 cubic yards exceeded the minimum specified <br />testing frequency of one test per 500 cubic yards. Nuclear density tests performed for the <br />2010 Phase 5 VLF SLF are summarized in Table 13. Any failing areas were reworked, <br />re-compacted, and retested to meet specifications. The number of retests was not used to <br />determine the testing frequency. Holes made in the SLF during testing were filled by <br />tamping fine SLF material into the holes, as specified. <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.amee.com <br />34