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4.2.6 Temperature Monitoring <br />ame0 <br />approximately 50 feet of each other during DCF placement. AMEC verified that wrinkles in <br />the geomembrane did not fold over, that PVC grade markers were placed on a maximum <br />50 -foot by 50 -foot grid and at grade breaks, and that material in the fill was suitable. AMEC <br />continuously inspected geomembrane during DCF placement, marked areas for repair, if <br />required, and verified that all repairs were completed to project specifications. After final <br />grading, AMEC monitored removal of PVC grade markers. <br />AMEC monitored ambient air temperatures using a Davis Vantage Pro 2 data - logging <br />weather system. Temperatures were measured every hour. The lowest and highest daily <br />temperatures are summarized in Table 2. <br />During placement of fill materials, when the ambient air temperature was less than 32 °F for <br />longer than one hour in the previous 24 hours, AMEC was required to monitor the fill <br />temperatures at depths of 3 inches and 6 inches, at a frequency of 6 tests per acre, and <br />calculate the average fill temperature from the lower temperature of the 3 -inch and 6 -inch <br />tests. No frozen materials were placed during the construction of the Process Solution <br />Enhancement System. Fill temperature monitoring is summarized in Table 3. <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 22 <br />