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4.2.3.1 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 placing 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 2.5. AMEC and Lone Star approved the final surface of <br />the SLF within the Process Solution Enhancement System prior to geomembrane <br />deployment. <br />4.2.3.2 Moisture - Density Test Results <br />AMEC performed a total of 13 in -place moisture - density tests of SLF. AMEC compared <br />results of the field moisture content and density tests to the maximum standard Proctor dry <br />density and optimum moisture content values of material with similar gradation and plasticity <br />characteristics. Standard Proctor maximum dry density and optimum moisture content <br />values for samples with greater than ten percent plus 3 /4 -inch material were corrected <br />according to ASTM D4718 to facilitate direct comparison to nuclear density values. The <br />moisture - density testing frequency of approximately one test per 395 cubic yards exceeded <br />the minimum specified testing frequency of one test per 500 cubic yards. Nuclear density <br />tests performed for the Process Solution Enhancement System SLF are summarized in <br />Table 10. Any failing areas were reworked, re- compacted, and retested to meet <br />specifications. The number of retests was not used to determine the testing frequency. <br />Holes made in the SLF during testing were filled by tamping fine bentonite material into the <br />holes, as specified. <br />4.2.3.3 Depth Verification <br />ame0 <br />Ames drilled a total of eight (8) holes in the compacted SLF to verify that the minimum <br />12 -inch compacted depth had been achieved. AMEC monitored the SLF depth verification <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 corn 20 <br />