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A=COM <br />Technical Memorandum — 3 Dam Reslope Project <br />October 5, 2017 <br />Page 6 <br />l , <br />{ <br />.,Pz' t ' <br />i * k <br />Photo 6 — View of excess tailings placement in stepback area (June 27). <br />Julv 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 740E 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 />