2012-02-28_REVISION - M1980244 ‎(56)‎

• Permit No: M1980244
• IBM Index Class Name: Revision
• Doc Date: 2/28/2012
• Doc Name: SHEET 2 OF 6, STORM WATER PLAN
• From: CC&V
• To: DRMS
• Type & Sequence: AM10
• Email Name: TC1
• Media Type: M
• Archive: No

Basins and
Plan View
1" =500 ft (DSize)
Diversion Channels - Existing Conditions and During Mining Development
Legend
Basin Name
Area EC SA -2
101 Acre 72 cfs 100yr Discharge
10yr Discharge 41 offs 10 AcreFeet 2 x 10yr Volume
� Channel Name
.� 100 -yr Discharge (cfs)
10 -yr Discharge (cfs)
■ i ■ ■ ■ i ■ m Temporary or Existing Channel
miSimffminffm Proposed New Channel
IN 10 1 ■ i . I ■ 1 ■ 1 W Mining Boundary
Basin Boundary
Land Use -SCS Curve Number Criteria
Curve No.
Land Use
90
Compacted Roadways and Crestof
Land Use 1
Land Use 2
Land
Use 3
Area orRevegetation
66
Post Reclamation Forested, Pre- mining
Pond Size as
Natural Areas
Receiving EMP
Alternate
I
Arithmetic
Runoff
Design
Function of
(Current)or
Basin
Receiving
EMP during
Pdesign
Total Area
CN1 Areal S(in) Q1
CN2 Area2 S(in) Q2
CN3 Area3
S(in) Q3
e
Average
CNg
Volume
Design Criteria
Volume
Basin Area
Description
Mining
(Ac -Ft)
(Ac -Ft)
(AF perAcre)
WHEX -A1 EMP018
2.70
22.80
66
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
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 -Dl 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 I
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
I
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-El EMP020
2.70
110.60
66
104.0
5.15
0.41 90 6.636 1.11 1.71 67
.- ___.....___ -._ __,._ - _.._....._._- _- . -.__- .._... -. -- .__
4.5
_
�-
-2
9.0
0.08
--
-- _._-... _...__.___._- _..--- ---_ --
EMP -10 Total Removed by WHEX
_
- 2.70
_.-- -- _.._..__--- --
40.90
._ --
_ -_
-_
.....__......_. _._...,_._ _,.....-
Ponds are sized for 2 times the 10- yr /24 -hr discharge volume from contributing
( 1.7
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
2 xV10
19.7
0.17
EMP- 018Total Above WHEX High Wall - Pumpe
2.70
64.90
that the flow from basins may go to different EMP ponds throughout the life of
2.6
2xv1 o
5.7
0.09
EMP- 019Total Removed by WHEX& Rebuilt
2.70
105.30
mine as whown on the drawing, so these Design Volumes should be considered
7.6
V10 - FlowThrough
7.6
0.07
EMP -020 Total East of Cameron
2.70
110.60
as a guideline 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
3.1
6.1
0.13
NC -Bl EMP8a
NC-C1 EMP8a
2.70
2.70
21.40
15.80
50
66
11.8
7.9
10.00
515
0.05 90 9.6 1.11 1.71 68
0.41 50 7.9 10.00 0.05 58
1.4
0.3
2.8
0.6
0.13
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
270
5.43
66
2.7
5.15
0.41 71 2.7 4.08 0.59 69
0.2
0.5
EMP8a Total Existing Depression Area
91.70
66
1 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
1.1
2.2
0.07
PG -D1 EMP -009
2.70
30.40
66
30.4
5.15
0.41 66
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
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
EMP -22 Total Flow Future - Near End of Mining
19.70
19.7
0.7
2xV10
EMP-21 Total Flow Replaces EMP8a
45.50
45.5
Pond Sizes for 2 times the 10- yr /24 -hr discharge volume from contributing basins.
2.0
2 xV10
3.9
Four Ponds -3 are removed&
270
83.70
83.7
2.9
2xV10
5.7
Avg 0.08
EMP -9 Total Flow
replaced
Vindicator
VIN -A1 EMP013
2.70
57.30
90
1.1
1.11
i 1.71 50 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 orRevegetation
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 124 -Hr 2.7 inches
Depths
100Yr /24 -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- 0.8xS)
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.
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