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tests and documented results. Depth verification holes were filled with fine bentonite <br />material, as specified. All of the holes drilled into the SLF had compacted depths greater <br />than 12 inches. The testing frequency of 2.7 holes per acre exceeded the minimum <br />specified testing frequency of two measurements per acre. The SLF depth verification <br />results met project specifications and are presented in Table 11. <br />4.2.4 Pipe Bedding Material <br />4.2.4.1 Field Monitoring <br />amee <br />AMEC observed PBM placement to verify lift thickness, adequate compaction, acceptable <br />moisture conditions, and observed that no damage occurred to the 36 -inch culvert that the <br />PBM surrounded. <br />4.2.4.2 Moisture - Density Test Results <br />AMEC performed a total of 5 in -place moisture - density tests of PBM. AMEC compared <br />results of the field moisture content and density tests to the standard Proctor maximum 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 % -inch material were corrected <br />according to ASTM D4718 to facilitate direct comparison to nuclear density values. <br />Nuclear density tests performed for the Process Solution Enhancement System PBM are <br />summarized in Table 12. Any failing areas were reworked, re- compacted, and retested to <br />meet specifications. The number of retests was not used to determine the testing frequency. <br />Holes made in the PBM during testing were filled by tamping fines from the PBM material <br />into the holes, as specified. <br />4.2.5 Drain Cover Fill <br />AMEC provided visual monitoring of DCF placement. One AMEC monitor and at least two <br />Ames laborers were present monitoring each dozer, unless two dozers were within <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 21 <br />