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A=COM <br /> Technical Memorandum—3 Dam Reslope Project <br /> October 5, 2017 <br /> Page 6 <br /> pro q <br /> 'y <br /> i - <br /> Photo 6—View of excess tailings placement in stepback area (June 27). <br /> July 18, 2017 <br /> Regrading/trimming of the downstream slope of the original 3 Dam was just finishing at the south <br /> abutment (except for around two remaining instruments near the south end of the dam that need to <br /> be lowered), using a Caterpillar D8T dozer with GPS elevation control on the blade. <br /> The cut varied from about 1 to 4 feet at the toe and 2 to 10 feet at the crest. The exposed material at <br /> the base of the cut was similar to that observed on previous visits. <br /> All but two of the instruments that required adjustment have been lowered, with one of the last two <br /> (Piezometers G-2) lowered today. A spray-on dust suppressant has been placed on the northern <br /> one-half of the regraded slope. <br /> Placement/compaction of the excess fill was in progress on the south end of the stepback area, west <br /> of the stepback drain. A Caterpillar 950F front-end loader was loading three Cat 740B articulating <br /> haul trucks, who in turn hauled the material to the 3 Dam stepback area. A Cat D8T dozer then <br /> spread the material in lifts and provided basic tracking compaction. AECOM recommended that the <br /> haul trucks also alter their path as they traverse the drop area, to provide additional compaction. <br />