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2012-07-03_REVISION - M1984014
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2012-07-03_REVISION - M1984014
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Last modified
6/15/2021 2:25:42 PM
Creation date
7/11/2012 3:05:11 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1984014
IBM Index Class Name
REVISION
Doc Date
7/3/2012
Doc Name
RESPONSE TO ADEQUACY REVIEW #2
From
COTTER
To
DRMS
Type & Sequence
AM1
Email Name
GRM
Media Type
D
Archive
No
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JD -8 Mine - Drainage Design Plan 13 <br />Table 11. Drainage Basin Areas - Planned Final Topography <br />Area Area <br />Zone (ft2) (acres) Type <br />Reclaimed Waste Rock 223,707 5.14 Disturbed area <br />1 50,280 1.15 Non - contact area (undisturbed) <br />4 73,550 1.69 Non - contact area (undisturbed) <br />4.2 10 -year 24 -hour Runoff and Retention for Post - Mining Condition <br />The calculated total runoff entering the operational and post mining retention Pond 3 from the 10 -year 24- <br />hour storm is shown in Table 12 and calculated at 12,785 ft <br />Table 12. Calculated 10 -year 24-hour Runoff based on Planned Final Topography <br />Soil Type / Curve Rainfall Runoff Runoff <br />Conditi AREA Retention 9 Q <br />AREA Hydrologic Group/ Number P <br />Cover Description on (acres) CN (inches) S (inches) (ft <br />Reclaimed Bodot / Ustic Torriorthents <br />Waste Rock Group C Poor 5.14 85 1.80 1.76 0.65 12,165 <br />Sagebrush with grass understory <br />Bodot / Ustic Torriorthents <br />1 Group C Fair 1.15 63 1.80 5.87 0.06 251 <br />Sagebrush with grass understory <br />Bodot / Ustic Torriorthents <br />4 Group C Fair 1.69 63 1.80 5.87 0.06 369 <br />Sagebrush with grass understory <br />Total: 12,785 11 <br />The preliminary location and dimensions for Retention Pond 3 are shown in Figure 3 and Table 13. The <br />proposed volume of 13,130 ft (at 2.5 ft. deep) using the available 9,656 ft footprint shown with 5H:1V <br />side slopes and a 3.5 ft total depth will retain runoff from the 10 -year 24 -hour event with a 1.0 ft freeboard. <br />The freeboard will be reduced to 0.5 ft during the 100 -year 24 -hour event. <br />Table 13. Planned Dimensions for the Operational and Post - Mining Storm Water Retention <br />Structure (Pond 3) <br />Area of Storm Water Pond <br />Area of Floor (5H:1V slopes) <br />Perimeter of Floor <br />Total Depth <br />Volume (2.5 ft. deep) <br />Freeboard (10 -year 24 -hour) <br />Freeboard (100 -year 24 -hour) <br />9,656 ft <br />3,375 ft <br />300.6 ft <br />3.5 ft <br />13,130 ft <br />0.301 acre -ft <br />98,210 Gallons <br />1.0 ft <br />0.5 ft <br />4.3 100 -year 24 -hour Routing Capacity <br />The storage and routing capacity of Pond 3 in the operational and post- mining conditions were evaluated <br />using the NRCS Graphical Peak Discharge Method. Calculation parameters for the 100 -year 24 -hour <br />4122A.120702 Whetstone Associates • <br />
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