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ASCOM <br />Technical Memorandum -- 3 Dam Reslope Project <br />October 5, 2017 <br />Page 8 <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 <br />ID <br />Threshold <br />Values feet <br />High Alarm <br />Values feet <br />Piezometer <br />ID <br />Threshold Values <br />feet <br />High Alarm <br />Values feet <br />1-2 <br />8857 <br />8852 <br />1-3 <br />8850 <br />8845 <br />H-2 <br />8825 <br />8820 <br />H-313 <br />8826 <br />8826 <br />H -2A <br />8825 <br />8820 <br />H-3 <br />8826 <br />8826 <br />GH -2 <br />8814 <br />8809 <br />H -3A <br />8826 <br />8826 <br />G-2 <br />8792 <br />8792 <br />G-3 <br />8810 <br />8805 <br />F-2 <br />8778 <br />8778 <br />F-3 <br />8790 <br />8790 <br />1-2N <br />8852 <br />8847 <br />1-4 <br />8841 <br />8836 <br />H -2N <br />8828 <br />8828 <br />G-4 <br />8803 <br />8798 <br />G -2N <br />8812 - - <br />8812 - - <br />F-4 <br />8789 <br />8789 <br />F -2N <br />8780 <br />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 />