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2011-03-29_REVISION - M1977493 (4)
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2011-03-29_REVISION - M1977493 (4)
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Last modified
6/15/2021 5:47:18 PM
Creation date
4/1/2011 7:10:25 AM
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Template:
DRMS Permit Index
Permit No
M1977493
IBM Index Class Name
REVISION
Doc Date
3/29/2011
Doc Name
Water Quality
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DRMS
Type & Sequence
AM6
Media Type
D
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• What sampling is currently being done by Climax at the Eagle Park Reservoir? We need to evaluate <br />against the current water quality standards, and agreements between CMC and Eagle Park Reservoir <br />Company. <br />Does the reclamation plan consider proposed nutrient water quality critreria (e.g. for use of fertilizers)? <br />Dust concerns from tailings ponds, mining operations, especially during reclamation, when dry areas may <br />be more likely to erode. <br />It appears that under existing conditions (Figure AM-06-G-01) the Robinson Lake outlet works is <br />delivering process storage water to the land located directly to the northeast of the Eagle Park Reservoir. <br />Is the intent that the water goes into the Robinson Lake seepage pumping system? If any water is allowed <br />to flow out of the Lake prior to the construction of the Robinson Lake Reclaim system, is there <br />infrastructure in place to capture the water? Does the seepage pumping system pump water back into <br />Robinson Lake? If so, this is not clear on the map for the existing condition. <br />The proposed reclaimed water pipeline from the Robinson Lake outlet works poses a possible threat to the <br />Eagle Park Reservoir if it ruptures or leaks. Is there any secondary containment proposed for this <br />pipeline? <br />The application states that a cutoff wall has been installed between Robinson Lake and Eagle Park <br />Reservoir. Has any leak testing been performed on this wall? If may be necessary to monitor the <br />effectiveness of the cutoff from Robinson Lake while the lake is being used for process water. <br />• Section G-7.6 discusses flood routing assumptions. Please be more specific about the modeled heights of <br />the decant height and the spillway elevation used in the model. Wouldn't it be conservative if the <br />spillway elevation was set to be lower, not higher as this would reduce the total storage volume available? <br />Does Tenmile TSF spill near the Tenmile Decant? <br />Section G-7.7 discusses flood storage capacity required by in the Tailings Storage facilities. It is stated <br />that 2,400 AF of flood storage capacity and a decant discharge rate of 156 cfs would be sufficient to <br />provide 100 year PMP protection for the 100 year flood. Will 2,400 AF of capacity still be available for <br />flood storage when the Tenmile TSF is at the end of its use? The Tenmile decant empties into Robinson <br />Lake or Mayflower TSF. Is Robinson Lake large enough to contain the 156 cfs for the time that will be <br />needed for the PMP event? If water is decanted to the Mayflower TSF, were the flood impacts <br />considered jointly or separately in order to size the Mayflower TSF and decant rate. Also, during a large <br />storm event with simultaneous decantation, settling time in the TSFs would be very limited. The holding <br />capacity of Robinson Lake and water quality into Robinson Lake that may enter Eagle Park Reservoir via <br />seepage or overtopping are concerns. <br />During Phase II, Section G-4.8 states that it will be necessary to accurately regulate the flow rate <br />discharged from the Mayflower TSF pool so that treatment plant capacity is not exceeded. Will <br />secondary treatment be completely bypassed during the PMP event during Phase II? Where will the <br />untreated water go? <br />0 Water Rights
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