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GANSER LUJAN R ASSOCIATES <br />Hydrogeological and Environmental Consultants <br />Figure 7 below shows HEC RAS output for pre -mining conditions. Note the markedly dissimilar <br />topographic surface on the cross-section 3193.73 as compared to the existing mining surface as <br />shown in Figure 6. The uniform and relatively flat surface allows flood waters to spread across <br />the western floodplain thereby diminishing the probability of flooding on the east side of the river <br />channel. <br />Figure 7 <br />HEC -RAS Results <br />Pre -Mining Conditions <br />$ 481 <br />W <br />i? 4W <br />5 487 <br />� 487 <br />100) 2011D <br />Pre-Mining8chofer 8-12-2015 <br />R5= 423311 <br />04 .031 ��.04—.� <br />EG PF 3 <br />WR PF 3 <br />EGPF2 <br />WS PF2 <br />EGPF1 <br />VrS W 1 <br />Balk Ste <br />3OW 4DOD MW BOOD 70W <br />Pm -Mining Bachofer 8-12-2015 <br />RS= 31837! <br />04 <br />Pre -Mining Bachofer8-12-2015 <br />RS= 28437 <br />a oh 04� <br />3 <br />1 EGPF3 <br />WS PF 3 <br />EGPF2 <br />WS PF 2 <br />EGPF1 <br />WS PF 1 <br />G-ro <br />Bak Gm <br />f—T400D TAT 9000 WW 78W <br />Stam ft <br />3 <br />1 EGPF3 <br />WS PF 3 <br />EGPF2 <br />WS PF 2 <br />EGPF1 <br />WS PF 1 <br />G -M <br />Bak S6 <br />70W <br />-10- <br />Pre -Mining %choler 8-12-2015 <br />RS=47W78 <br />.04 — , O4—+I <br />48 <br />.W1 <br />LMpnd <br />EGPF3 <br />W3 PF3 <br />EGPF2 <br />48V <br />WG PF 2 <br />w <br />EGPF7 <br />48 <br />Bei Sr <br />4875 <br />0 1000 <br />3700 30W 4DW 5000 GOOD 700D <br />$ 481 <br />W <br />i? 4W <br />5 487 <br />� 487 <br />100) 2011D <br />Pre-Mining8chofer 8-12-2015 <br />R5= 423311 <br />04 .031 ��.04—.� <br />EG PF 3 <br />WR PF 3 <br />EGPF2 <br />WS PF2 <br />EGPF1 <br />VrS W 1 <br />Balk Ste <br />3OW 4DOD MW BOOD 70W <br />Pm -Mining Bachofer 8-12-2015 <br />RS= 31837! <br />04 <br />Pre -Mining Bachofer8-12-2015 <br />RS= 28437 <br />a oh 04� <br />3 <br />1 EGPF3 <br />WS PF 3 <br />EGPF2 <br />WS PF 2 <br />EGPF1 <br />WS PF 1 <br />G-ro <br />Bak Gm <br />f—T400D TAT 9000 WW 78W <br />Stam ft <br />3 <br />1 EGPF3 <br />WS PF 3 <br />EGPF2 <br />WS PF 2 <br />EGPF1 <br />WS PF 1 <br />G -M <br />Bak S6 <br />70W <br />-10- <br />