Final Supplemental Environmental Impact Statement, Golden Sunlight Mine Pit Reclamation 2007 Chapter 4
Final Supplemental Environmental Impact Statement, Golden Sunlight Mine Pit Reclamation 2007 Chapter 4
Montana.Dept. of Environmental Quality
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Nondegradation criteria failed. 4--] 24 Partial Pit Backfill With Downgradient Collection Alternative Chapter 4 Environmental Consequences 0.8 -/— Range of Predicted Pit SeepageiW ith Meia^ure 1.5b .:=' : ("u'f^rad lent capture) :12- : 27gprh ^6^Hd^6^P/^ted*^^^ ■Seep.ggej : ;Wlt^ ; «J v'\*»vx"\sij.; ■-.-' >*A-" : >*V^"^]^^i^j^iji»4*' 10 15 20 25 Pit Seepage (gpm) r-t" 30 35 40 -£- -e- -H- — 0% capture efficiency — One System at 80% capture efficiency —Two Systems, each at 80% capture efficiency... (combined 92% efficiency) — Two Systems, each at 87.5 % capture efficiency (combined 96% efficiency) - DEQ 7 GW Standard for Nickel (0.1 mg/l) 45 Figure 4-2. Predicted nickel concentration at the mixing zone boundary for various groundwater capture scenarios and pit seepage rates; the gray boxes represent the predicted ranges of pit seepage with and without upgradient capture. The results of the primary pit flowpath modeling are summarized in the following points with respect to DEQ-7 groundwater quality standards and Nondegradation criteria (17.30.715 ARM).
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