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AZCW <br />Henderson 3 Dam Buttress Design <br />January26, 2018 <br />Page 12 <br />Borrow Source <br />The selected buttress fill is tailings material borrowed from selectively borrowed material from the <br />slopes of 1 Dam. The material will need to be free of deleterious material. <br />MONITORING CONSIDERATIONS <br />The slope shall be monitored continuously throughout construction If signs of slope instability <br />(tension cracking, sloughing, slope rotation, etc.) are observed, work shall be immediately stopped <br />and the Engineer shall be notified. <br />Piezometer responses in the area shall also be closely monitored through the use of Canary. <br />Increased frequency of readings will be required. Any signs of instability or if the pore pressure ratio <br />begins to approach 1, the Engineer shall be notified and work shall remain stopped until approved by <br />the Engineer. <br />M.=SWr*ft WTRM514%_HDN &ariSG"almmElm%DRMS R@p& WpwW4"Wmah_ 3 Dem &am Dnlpr Leaw Repw1_Ra B_ Finale <br />