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2013-10-30_REVISION - M1977310 (3)
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2013-10-30_REVISION - M1977310 (3)
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Last modified
6/15/2021 2:28:45 PM
Creation date
11/5/2013 5:47:39 PM
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Template:
DRMS Permit Index
Permit No
M1977310
IBM Index Class Name
REVISION
Doc Date
10/30/2013
Doc Name
DRAINAGE DESIGN PLAN FOR THE JD6 MINE
From
COTTER
To
DRMS
Type & Sequence
AM1
Email Name
TC1
SJM
Media Type
D
Archive
No
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JD -6 Mine — Drainage Design Plan 12 <br />The Middle Diversion Structure (MDS) receives runoff from one small sub -basin (N -D, 0.91 acres) below <br />the UDS. In addition, the MDS extends approximately 86 feet into the adjacent sub -basin and captures <br />runoff from a small fraction of land (0.079 acres). The MDS could also collect any over flow that might <br />occur from the eastern half of the UDS. <br />The Upper and Middle diversion structures route water into a natural drainage located just east of the JD -6 <br />Mine yard (Figure 1). The receiving sub -basin is mapped as an intermittent stream which confluences with <br />the diverted sub -basin approximately 1,300 feet downstream of the diversion structures (Figure 1). <br />The Lower Diversion Structure (LDS) is in place to divert non - contact stormwater to the east and north, <br />around the Duggan adit and the central mine facilities area. The sub - basins contributing runoff to the LDS <br />are relatively small, as shown in Figure 1. Sub -basin N -E (1.43 acres) contributes runoff to the east - <br />flowing branch of the LDS. Sub -basin N -F (4.19 acres) contributes runoff to the north - flowing branch of <br />the LDS (Table 7). <br />Table 7. Sub - Basins Contributing to Upper, Middle, and Lower Diversion Structures <br />Sub -Basin <br />Area <br />Area <br />Type <br />Description / Type <br />(ft) <br />(acres) <br />N -A <br />2,282,020 <br />52.4 <br />Non - contact <br />Main drainage area above Upper Diversion Structure <br />N -B <br />52,810 <br />1.21 <br />Non- contact <br />Small triangular area above west Upper Diversion Structure <br />N -C <br />30,830 <br />0.71 <br />Non - contact <br />Small triangular area above east Upper Diversion Structure <br />1,440 <br />0.033 <br />Non - contact <br />Adjacent sub -basin, reports to Upper Diversion Structure <br />N -D <br />39,820 <br />0.91 <br />Non - contact <br />Reports to Middle Diversion Structure <br />3,430 <br />0.079 <br />Non - contact <br />Adjacent sub -basin, reports to Middle Diversion Structure <br />N -E <br />62,230 <br />1.43 <br />Non - contact <br />Reports to Lower Diversion Structure, flowing east <br />N -F <br />81,040 <br />1.860 <br />Non - contact <br />Reports to Lower Diversion Structure, flowing north <br />4.2 Sub -Basin Intercepted by CR EE19 <br />Stormwater from sub -basin N -G is collected in the borrow ditch along County Road EE19. This runoff is <br />derived from upslope (west) of the mine site, in a 4.37 -acre sub -basin that extends from the local ridgeline <br />to CR EE19. As shown in Figure 2, stormwater runoff that arrives in the borrow ditch is routed northward <br />into the natural drainage north of the mine. This water does not contact mine facilities and this sub -basin is <br />not included in the WinTR55 model. Montrose County maintains the EE19 road and associated ditches. <br />Table 8. Sub -Basin Intercepted by EE19 Road <br />Sub -Basin Area Area (ft) (acres) Type Description / Type <br />N -G 190,150 4.37 Non - contact Ridgeline to borrow ditch on County Road EE19 <br />4148A.131028 Whetstone Associates • <br />
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