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A=COM <br /> Technical Memorandum—3 Dam Reslope Project <br /> October 5, 2017 <br /> Page 8 <br /> AS-BUILT CONSTRUCTION DRAWINGS <br /> By compiling notes from AECOM's observations combined with an as-built survey of the work area, <br /> an as-built plan of the blanket drain area was prepared and is appended. <br /> UPDATED PIEZOMETER THRESHOLDS FOR 3 DAM <br /> The threshold limits were reestablished for an undrained stability loading condition considering the <br /> updated 3 Dam geometry. A summary of these values are presented in Table 1. <br /> Table 1- Revised Threshold Values for 3 Dam Piezometers <br /> Piezometer Threshold High Alarm Piezometer Threshold Values High Alarm <br /> ID Values(feet) Values(feet) ID (feet) Values(feet) <br /> 1-2 8857 8852 1-3 8850 8845 <br /> H-2 8825 8820 H-3B 8826 8826 <br /> H-2A 8825 8820 H-3 8826 8826 <br /> GH-2 8814 8809 H-3A 8826 8826 <br /> G-2 8792 8792 G-3 8810 8805 <br /> F-2 8778 8778 F-3 8790 8790 <br /> 1-2N 8852 8847 1-4 8841 8836 <br /> H-2N 8828 8828 G-4 8803 8798 <br /> G-2N 8812 8812 F-4 8789 8789 <br /> F-2N 8780 8780 <br /> MAINTENANCE CONSIDERATIONS <br /> Mr. Guite stated that annual regrading of rill erosion and placement of a spray-applied dust <br /> suppressant is an on-going process for maintenance of the slopes of the tailings facility that will be <br /> managed in accordance to existing policies and procedures. <br />