2011-02-28_REVISION - M1980244 ‎(8)‎

• Permit No: M1980244
• IBM Index Class Name: Revision
• Doc Date: 2/28/2011
• Doc Name: Teller County Mining Development Plan Amendment for Mine Life Extension 2 MLE2 Storm Water Plan 2
• From: CC&V
• To: DRMS
• Type & Sequence: AM10
• Media Type: M
• Archive: No

Basins and Diversion Channels - Existing Conditions and During Mining Development
Plan View
1 " =500 ft (DSize)
Legend
Basin Name
Area EC SA -2
101 Acre 72 cfs 100yr Discharge
10yr Discharge 41 cfs 10 AcreFeet 2 x 10yr Vo/ume
E�Channel Name
a�
100 -yr Discharge (cfs)
10 -yr Discharge (cfs)
■ m ■ i ■ a Temporary or Existing Channel
mi'?imimimim Proposed New Channel
■ i M i N i M 1 M 1 M i M Mining Boundary
Basin Boundary
Land Use -SCS Curve Number Criteria
Curve No.
Alternate
90
Compacted Roadways and Crestof
Land Use 1
Land Use 2
Land Use 3
Pre -and Post Reclamation Grassed
Area or Revegetation
66
Pond Size as
Receiving EMP
Arithmetic
Receiving
Runoff
Design
Function of
(Current) or
(
Average
Basin
EMP during
Pdesign
Total Area
CN1 Area S(in) Q1
CN2 Area2 S(in) Q2
CN3 Area3 S(in) Q3
Volume
Design Criteria
Volume
Basin Area
Description
CN
Mining
i
(Ac -Ft)
(Ac -Ft)
(AF perAcre)
WHEX -A1 EMP018
2.70
22.80
66 1
6.8
5.15
0.41 71 14.82 4.08 0.59 90 1.14 1.11 1.71 70.45
1.1
2.3
0.10
WHEX -B1 EMP018
2.70
13.60
66
4.1
5.15
I
0.41 71 8.16 4.08 0.59 90 1.36 1.11 1.71 71
0.7
1.5
0.11
WHEX -C1 EMP018
2.70
28.50
66
28.5
5.15
0.41 66
1.0
1.9
0.07
WHEX -D1 EMP010 Mine
2.70
40.90
66
38.0
5.15
0.41 90 2.863 1.11 1.71 68
1.7
3.4
0.08
WHEX -E1 EMP019 Mine
2.70
105.30
66
27.4
5.15
0.41 71 77.922 4.08 0.59 70
4.8
9.6
0.09
ECOSA -A1 EMP016
2.70
47.60
66
44.7
5.15
0.41 90 2.856 1.11 1.71 67
1.9
3.9
0.08
ECOSA -B1 EMP017
2.70
59.50
71
59.5
4.08
0.59 71
2.9
5.9
0.10
ECOSA -C1 EMP017
2.70
33.60
71
11.8
4.08
0.59 50 16.8 10.00 0.05 90 5.04 1.11 1.71 63
1.4
2.7
0.08
ECOSA -D1 EMP017
2.70
20.80
71
4.2
4.08
0.59 66 16.64 5.15 0.41 67
0.8
1.5
0.07
ECOSA -E1 EMP020
2.70
110.60
66
104.0
5.15
0.41 90 1 6.636 1.11 1.71 67
4.5
9.0
0.08
_ _ _...-.....__._ ...................._--....._...._ ___.___...---__._._.-- -.__.._ -_
___...__.-.._.._......_....._. .._..__...._.......__...._._.
--
- -___
__
__._..__._
......................__...-_. ......- ,...- ...__.....- .. -.. -.. ---.,- ..- ._---- . ........._ - .- ..,,.._.. .._..- ....._.._._... .. __......,.....,_..._., ..... ...._..- ...,..._. -._,. - ......._........
- -
EMP-1 0 Total Removed by WH EX
2.70
40.90
Ponds are sized for 2 times the 10- yr /24 -hr discharge volume from contributing
1.7
2 xV10
3.4
0.08
EMP -016 Total Existing
2.70
47.60
basins if there's no outlet (terminal structures); or for the 10- yr /24 -hr volume if pond
4.8
V10 - FlowThrough
4.8
0.10
EMP- 017Total Rebuilt Cameron Ponds
2.70
113.90
is fitted with pert pipe and volume evacuates to a downstream terminal EMP. Note
9.9
2xV10
19.7
0.17
EMP -018 Total Above WHEX High Wall - Pumpe
2.70
64.90
64.9
28
2xV10
5.7
0.09
that the flowfrom basins may go to different EMP ponds throughout the fife of
EMP -019 Total Removed by WHEX& Rebuilt
2.70
0
7.6
V10 - FlowThrough
7.6
0.07
mine as whown on the drawing, so these Design Volumes should be considered
EMP -020 Total Eastof Cameron
2.70
110.60
aSaguideline for reference purposes.
4.5
2xV10
9.0
Avg 0.09
NC -A1 EMP -8a
2.70
48.20
90
4.8
1.11
1.71
50
27.5
10.00
0.05
90
15.9
1.11
1.71
67
1 3.1
6.1
0.13
NC -B1 EMPSa
2.70
21.40
50
11.8
10.00
' 0.05
90
9.6
1.11
1.71
68
1.4
2.8
0.13
NC -C1 EMP8a
2.70
15.80
66
7.9
5.15
j 0.41
50
7.9
10.00
0.05
58
0.3
0.6
0.04
'
NC -D1 EMP8a
2.70
6.30
66
3.2
5.15
0.41
71
3.2
4.08
0.59
69
0.3
0.5
0.08
NC -E1 EMP8a
2.70
5.43
66
2.7
5.15
0.41
71
2.7
4.08
0.59
69
0.2
0.5
EMPBaTotal Exstin Depression Area
91.70
66
11.1
5.3
2xV10
10.5
Avg 0.10
PG -A1 EMP -021
2.70
22.40
66
11.2
5.15
0.41 71 11.2 4.08 0.59 69
0.9
1.9
0.08
PG -B1 EMP -021
2.70
23.10
66
8.1
5.15
0.41 71 15.0 4.08 0.59 69
1.0
2.0
0.09
PG -C1 EMP -009
2.70
31.90
66
31.9
5.15
0.41 66 ii
1.1
2.2
0.07
PG -D1 EMP -009
2.70
30.40
66
a 30.4
5.15
0.41 66 I
1.0
2.1
0.07
PG -E1 EMP -009
2.70
8.60
66
8.6
5.15
0.41 66
0.3
0.6
0.07
PG -F1 EMP -009
2.70
12.80
66
12.8
5.15
0.41 66
0.4
0.9
0.07
PG -G1 EMP -022
2.70
19.70
66
__.__..__
19.7
...- ..__._.
5.15
_.._ ........
0.41 66
_ - ......... ..._......,.- ._ - -_._- .- ____ -___ -_ ....,....,..,__..,._..,.
0.7
...-- ......
... _._
1.3
0.07
_ ..................,..._.,_.. _._._.._.___.__- .._- __- ._ - - -_ --
EMP -22 Total Flow Future -Near End of Mining
.,..._.____
__,........_..._,._
19.70
19.7
0.7
-_
2xV10
1.3
EMP -21 Total Flow Replaces EMP8a
45.50
1 45.5
Pond Sizes for 2 times the 10- yr /24 -hr discharge volume from contributing basins.
2.0
2xV10
3.9
Four Ponds -3are removed &
EMP -9 Total Flow
2.70
83.70
83.7
2.9
2xV10
5.7
Avg 0.08
replaced
Vindicator
VIN -A1 EMP013
2.70
57.30
90
1.1
1.11
1.71
50
1 28.7
10.00
0.05
66
27.5
5.15
0.41
58
1.2
2.4
0.04
Land Use -SCS Curve Number Criteria
Curve No.
Land Use
90
Compacted Roadways and Crestof
Stockpiles
71
Pre -and Post Reclamation Grassed
Area or Revegetation
66
Post Reclamation Forested, Pre- mining
Natural Areas
50 Overburden Fill Areas Face of Stockpiles
Design Precipitation Depths and Return
Period Criteria
2Yr /24 -Hr 1.8 Inches
Precipitation 10Yr /24 -Hr 2.7 inches
Depths
100Yr124 -Hr 3.5 inches
:Summary of Calculated Pond Sizes Based on Land Use
2)Table
Calculation of Excess Precipitation for
Each Land Use (SCS Method)
S= Potential Retention (inches) = (1000- 10xCN) /CN
Excess Precip (Q in inches) = (P- 0.2xS)2 /(P- O.SxS)
Runoff from each land use area is independent of
others within the same basin because the runoff is
independently collected by channels. Therefore,
Excess Precip (runoff) values from each land use are
summed to provide the total volume from each basin.
The EMP storage volume is based on the sum of the
runoff from contributing basins.
scow"