2012-02-28_REVISION - M1980244 ‎(3)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 2/28/2012
• Doc Name: VOL 6, PART 4: STORM WATER PLAN MAP, SUMMARY TABLE
• From: CC&V
• To: DRMS
• Type & Sequence: AM10
• Email Name: TC1
• Media Type: M
• Archive: No

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Basins and Diversion Channels - Existing Conditions and During Mining Development
Plan View
1 " =500 ft (DSize)
Legend
Basin Name
Area ECOSA -2
101 Acre 72 cfs 100yr Discharge
10yr Discharge 41 cfs 10 AcreFeet 2 x 10yr Volume
eca Channel Name
7r
100 -yr Discharge (cfs)
10 -yr Discharge (cfs)
■ ■ i an ■ ■ i ■ ■ Temporary or Existing Channel
=121mimlgiggion Proposed New Channel
■ ■' ■ ■ ■ ■ ■ Mining Boundary
mem Basin Boundary
Land Use -SCS Curve Number Criteria
Curve No. Land Use
90 Compacted Roadways and Crest of
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 /24 -Hr 2.7 inches
Depths
100Yr /24 -Hr 3.5 inches
4 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 ofthe
runoff from contributing basins.
Z
Z
0
rn
LLI
W
Receiving EMP
(Current) or
Basin Description
Alternate
Receiving
EMP during
Mining
Pdesign
�I
Total Area
Land Use 1
� ��
CN1 Areal S(in) " Ql
Land Use 2
CN2 Area2 S(in) Q2
Land Use 3
�
CN3 '+ Area3 S(in) Q3
I
Arithmetic
Average
CN
Runoff
Volume
(Ac-Ft)
)
Design Criteria
Design
Volume
Ac Ft
( )
Preliminary Issue For Review
Pond Size as
Function of
Basin Area
AF e
( p rAcre)
117112
WHEX -A1 EMP018
WHEX -Bl EMP018
WHEX -C1 EMP018
WHEX -Dl EMP010 Mine
WHEX -E1 EMP019 Mine
ECOSA -A1 EMP016
ECOSA -Bl EMP017
ECOSA -C1 EMP017
ECOSA -D1 EMP017
ECOSA-E1 EMP020
..._..._____..__._- __._.._.
EMP -10 Total Removed by WHEX
EMP- 0116Total Existing
EMP- 017Tota Rebuilt Cameron Ponds
EMP -018 Total Above WHEX High Wall - Pumpe
EMP -019 Total Removed by WHEX& Rebuilt
EMP -020 Total East of Cameron
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
2.70
___.__...__.
2.70
2.70
2.70
2.70
2.70
2.70
22.80
13.60
28.50
40.90
105.30
47.60
59.50
33.60
20.80
110.60
_.._ _...__
40.90
47.60
113.90
64.90
105.30
110.60
66
66
66
66
66
66
71
71
71
66
-.
6.8 5.15
4.1 5.15
28.5 5.15
38.0 5.15
27.4 5.15
44.7 5.15
59.5 4.08
11.8 4.08
4.2 4.08
104.0 5.15 _._
0.41 71 14.82 4.08 0.59 90 1.14 1.11 1.71 70.45
0.41 71 8.16 4.08 0.59 90 1.36 1.11 1.71 71
0.41 66
f 0.41 90 2.863 1.11 1.71 68
0.41 71 77.922 4.08 0.59 70
0.41 90 2.856 1.11 1.71 67
0.59 71
0.59 50 16.8 10.00 0.05 90 5.04 1.11 1.71 63
0.59 66 16.64 5.15 0.41 67
0,4,1 90 6.636 1.11 1.71 67
L.._.._._._._._, _._- .___.. _.__ ...... ...... ..
Ponds are sized for 2 times the 10- yr /24 -hr discharge volume from contributing
basins if there's no outlet (terminal structures); or for the 10- yr /24 -hr volume if pond
is fitted with pert pipe and volume evacuates to a downstream terminal EMP. Note
that the flowfrom basins may go to different EMP ponds throughout the life of
mine as whown on the drawing, so these Design Volumes should be considered
as a guideline for reference purposes.
1.1
0.7
1.0
1.7
4.8
1.9
2.9
1.4
0.8
4.5
_
1.7
4.8
99
2.8
7 s
4.5
AccaptedforUseandDlstrlbuton
2.3
1.5
1.9
3.4
9.6
3.9
5.9
2.7
1.5
9.0
-- --------
3.4
P 4.8
19.7
5.7
' 7.6
9.0
0.10
0.11
0.07
0.08
0.09
0.08
0.10
0.08
0.07
0.08
-_- _-- ---_ -.
0.08
0.10
0.17
0.09
0.07
2xV10
V10 - FlowT'hrough
2xV10
2xV10
V10 - FlowThrough
2xV10
Avg 0.09
'
NC -A1 EMP -8a
NC -B1 EMP8a
NC -C1 EMP8a
NC -D1 EMP8a
NC -E1 EMP8a
-- _ - -....
EMPBaTotal Existing Depression Area
PG -A1 EMP -021
PG -B1 EMP -021
PG -C1 EMP -009
PG -Dl EMP -009
PG -El EMP -009
PG -F1 EMP -009
PG -G1 EMP -022
,.._....__......,.
EMP -22 Total Flow Future - Near End ofMlning --
EMP-21 Total Flow Replaces EMP8a
Four Ponds - 3 are removed &
EMP -9 Total Flow
replaced
2.70
2.70 _[_
2.70
2.70
2.70
_ - -
2.70
2.70
2.70
2.70
2.70
2.70
2.70
� � -�_ - -�
2.70
48.20
21.40
15.80
6.30
5.43
L...__�
91.70
22.40
23.10
31.90
30.40
8.60
12.80
19.70
19.70
45.50
83.70
90
50
66
66
66 ..
66
66
66
66 I
66
66
66
66
4.8 1.11
11.8 `; 10.00
7.9 5.15
11
32 515
27 515
11.1
11.2 a 5.15
8.1 5.15
31.9 5.15
30.4 5.15
8.6 515
12.8 5.15
19.7 5.15
19.7
45.5
83.7 �
1.71 50 27.5 '! 10.00 0.05 90 15.9 1.11 1.71 67
0.05 90 9.6 1.11 1.71 68
0.41 50 7.9 10.00 0.05 58
041 71 32 4.08 0.59
041 71 27 4.08 0.59 69
._,._ .... ....... ................ .._1 .. ....... - - - 69
'
0.41 71 11.2 4.08 0.59 69
0.41 71 15.0 4.08 0.59 69
0.41 66
0.41 66
0.41 66
0.41 66
0.41 66
Pond Sizes for 2 times the 10- yr /24 -hr discharge volume from contributing basins.
Alt. Drawing Number
Scale
Noted
DRAWING NO.
CCVI0 -SA"
3.1
1.4
0.3
03
0.2
5.3
0.9
1.0
1.1
1.0
0.3
0.4
0.7
0.7
2.0
2.9
2xV10
_
- 2xV10-
2xV10
2xV10
6.1
2.8
0.6
05
0.5
10.5
0.13
0.13
0.04
0.08
Avg 0.10
1.9
2.0
2.2
2.1
0.6
0.9
1.3
3.9
5.7
0.08
0.09
0.07
pD7
0.07
0.07
0.07
- - -��-
Avg 0.08
Vindicator
VIN -Al EMP013 1
2.70
57.30
90
1.1 1.11
1.71
50 28.7
10.00
0.05
66
27.57 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 Crest of
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 /24 -Hr 2.7 inches
Depths
100Yr /24 -Hr 3.5 inches
4 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 ofthe
runoff from contributing basins.
Z
Z
0
rn
LLI
W
N0.
DATE
MADE BY
CKD, BY
REMARKS
Cresson Mine
near Victor CO
•'`'''r"• Steffens and Associates Inc.
t
1 1 1 �+ ns 'Water Resources - Environmental - Mining Engineering
mOt{ A4sOt10 {85, In[. Golden, CD 80403 - 0:303.218.1801 - C:303.378.8181
11
1211/11
SDS
Preliminary Issue For Review
117112
SDS
ME
Added Details and Tables
0
30/2012
SD3
MFJTC
AccaptedforUseandDlstrlbuton
MLE2 Storm Water Plan
Poverty Gulch Basins and
Summary Table
CLIENT: CC &V Gold Mining Co.
0
Alt. Drawing Number
Scale
Noted
DRAWING NO.
CCVI0 -SA"
Sht 2 of 6
0