2012-12-27_REPORT - M1980244 (16)

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ameO characteristics. Standard Proctor maximum dry density and optimum moisture content values for samples with greater than ten percent plus 3/4 -inch material were corrected according to ASTM D4718 to facilitate direct comparison to nuclear density values. The moisture - density testing frequency of approximately one test per 118 cubic yards exceeded the minimum specified testing frequency of one test per 500 cubic yards. Nuclear density tests performed for the Phase 5 Berm Modification SLF are summarized in Table 7. Any failing areas were reworked, re- compacted, and retested to meet specifications. The number of retests was not used to determine the testing frequency. Holes made in the SLF during testing were filled by tamping fine bentonite material into the holes, as specified. 4.2.3.3 Depth Verification Ames drilled a total of four (4) holes in the compacted SLF to verify that the minimum 12 -inch compacted depth had been achieved. AMEC monitored the SLF depth verification tests and documented results. Depth verification holes were filled with fine bentonite material, as specified. All of the holes drilled into the SLF had compacted depths greater than 12 inches. The testing frequency of 13.6 holes per acre exceeded the minimum specified testing frequency of two measurements per acre. The SLF depth verification results met project specifications and are presented in Table 8. 4.2.4 Temperature Monitoring AMEC monitored ambient air temperatures using a Davis Vantage Pro 2 data - logging weather system. Temperatures were measured every hour. The lowest and highest daily temperatures are summarized in Table 2. During placement of fill materials, fill temperature monitoring was not necessary due to ambient temperature above 32 °F. Fill temperature monitoring is summarized in Table 3. AMEC Environment & Infrastructure, Inc. 2000 S. Colorado Blvd 2 -1000 Denver, CO 80222 Tel 303 - 935 -6505 Fax 303 - 935 -6575 www.amec.com 16