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required, and verified that all repairs were completed to project specifications. After final <br />grading, AMEC monitored removal of PVC grade markers. <br />4.2.6 Temperature Monitoring <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 1 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 2011 Phase 5 VLF <br />OSA 3rd Portion. Fill temperature monitoring is summarized in Table 3. <br />4.2.7 Underground Workings <br />ame9 <br />AMEC monitored the remediation of Underground Working No. 3014, including verification <br />that excavations were performed to minimum required dimensions, and that geogrid, SSF <br />and SF were installed as specified. <br />For remediation of Underground Working No. 3014, AMEC observed Ames backfilling the <br />working with structural fill and placing two layers of UX 1800 HS geogrid. The bottom layer <br />of geogrid was installed with six inches of SSF cover and compacted with a Caterpillar <br />CS563 SDVR, and then the second layer of geogrid was installed transverse to the first. <br />Twelve inches of SF was then placed and compacted. As -built drawings of the the <br />remediation are presented in Appendix N.1. <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.amec.com 24 <br />