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Phase IV Weekly Summary No. 46 Page 2 <br />Ames did not perform any confirmatory drilling activities associated with the Phase IVa construction <br />during this reporting period. <br />• Phase IVb <br />Ames removed deleterious material (wood, frozen SF) and hauled this material to a designated <br />location in Upper Arequa Gulch. <br />Ames continued Structural Fill (SF) placement and compaction activities in the western portion of the <br />Phase Nb footprint below UG-234a and above the old HWY 67 alignment. SF materials were placed <br />in horizontal lifts typically not exceeding 2 feet in loose thickness. A Caterpillaz CS563C roller <br />provided compactive effort, while a Caterpillaz water wagon provided moisture conditioning when <br />needed or required. SF was borrowed from the slope recontouring activities neaz the Alice Shaft (UG- <br />265) in Phase Nb. SF was also used to backfill "Shallow" workings UG-237, UG-298, UG-299, and <br />UG-300. <br />Ames performed excavation remediation activities of known underground workings UG-218b, UG- <br />237, UG-298, UG-299, UG-300, UG-305, UG-546, UG-548, and UG-549. The workings were <br />observed and verified to be "Shallow" or "Deep" as defined in the drawings and will be remediated <br />accordingly. <br />Ames continued placement of Select Structural Fill (SSF) into "Shallow" underground workings UG- <br />237, UG-298, UG-299, and UG-300. <br />Ames continued placement of Coazse Shaft Backfill (CSB) into "Deep" underground working UG-217 <br />Phase Nc <br />Ames continued placement of SF in Phase IVc at the saddle berm. Ames placed SF borrowed from <br />slope recontouring in Phase Nc neaz the Minnehaha (UG-268), and between stations 12+00 through <br />18+00 of the Phase IVc perimeter access road. SF materials were placed in horizontal lifts typically <br />not exceeding 2 feet in loose thickness. A Caterpillaz CS563C roller provided compactive effort, while a <br />Caterpillaz water wagon provided moisture conditioning when needed or required. <br />Ames performed excavation remediation activities for known underground workings UG-262, UG- <br />267b, UG-267c, UG-278, UG-287, and UG-508. The workings were observed and verified to be <br />"Shallow" or "Deep" as defined in the drawings and will be remediated accordingly. <br />Ames continued placement of Coarse Shaft Backfill (CSB) into "Deep" underground workings UG- <br />262, UG-268, UG-282, and UG-297. <br />Ames performed confirmatory drilling activities associated with the Phase Nc construction area on <br />known underground workings UG-267, UG-268, UG-286, UG-297, UG-286, UG-289, UG-290, UNK- <br />1, UNK-8, UNK-9, and Un-named Tunnel 1. <br />Ames continued blast drilling of underground workings within Phase Nc at UG-269, UG-286, and <br /> <br />Phae IVe461an2]-Feb9.doc Golder Associates Inc. <br />