2011-02-28_REVISION - M1980244 ‎(5)‎

• 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 4
• From: CC&V
• To: DRMS
• Type & Sequence: AM10
• Media Type: M
• Archive: No

VOITA
Halt
{
EMP -018
Plan View
1 " =50' (D -Size Dwg)
Ew/0
�t!{oJCOSP
EGB
rEmergency Spillway for EMP -
Backt7owfrom Pond through Ditch
Total Earthwork
Balanced Cut7Fi11- 8,200 CY
6 "C4 Riser Pipe
Spillway with
6- 1 "0 Perforations
at12 "centers
Cut 4itbelow `
grade and build 5
Embankment
to Elee 1005 -s to
provide 9.9 Acre feet
Capacity y _
Note: EMP-019 is
Temporary and will be
removed by WHEX It will
be replaced after WHEX
Backall with Permanent
2 EMP -019
Plan View
v,=501 (D-Size Dwg)
EMP- 017N- Coarse Sediment - -
nee Trap - UpgradeExistingpond
nee %j
ded. Pond wig all Saa nd �// � EMP- 017Main - Rehabilitate
and coarse Silt BasingB -1, C -1 and Existing Cameron Pond for Total
ounall from EMP -016 Capacity of 19.7 Acre Feet. Pond
Designed for Sediment Removal serves as Clear -water pool and
efficiency. Eu source for dust - control &
construction water
12" Outlet Riser with
Inlet at El. 10014. Routes a 6 V
and reduces flow to EMP- 01 9Main
to 6 cis for effectiveness proved settling
6" Low level
Drain and R'prapo
100-yr Spillway to Pump System
- - -- Spillway
EMP -17 Clear-water Pond Evacuate EMP -017 and use / od
- Grass -lined Interceptor water for Dust Control �� \
for Basin ECOSA -C1 _ -
S EMP- 017S - Coarse
\ Sediment Trap for Basin ECOSA-D1 From Basin
Existing pond upgraded as ECOSA -DI 1, 1
necessary.
EGO \
i
EMP -017 (Rebuilt Cameron Ponds)
4 Plan View
V =50' (D -Size Dwg)
Notes and Genera! s7ecifications:
1. The dimensions and construction of ditches are listed on Tables at
right, along with the armoring requirements (3" Riprap, 6" Riprap or
vegetated channels). The freeboard includes a minimum of 6- inches
at the 100 year calculated discharge plus the velocity head depth.
2. EMP Ponds and their embankments are intended to be water tight
because of their proximity to high walls of the mining areas.
Accordingly, they shall be constructed to conform to the following
general specifications:
a. Strip the footprint of the pond area down to suitable non - organic
soils with no less than 15 -20% fines ( <200 mesh). Proof roll the
footprint and compact as needed to achieve a target density of no less
than 90% in the basin and no less than 95% Std. Proctor in the
embankment
b. Select soils for the embankment that have at least 15% fines.
Place and compact the embankment soils in 8 -inch maximum loose
layers and compact to at least 95% Std. Proctor density.
c. Maximum slope of embankment shall be 2 :1. Maximum slope
inside sediment basin shall be 1.75:1. Maximum slope of reseeded
areas shall be 3:1.
3. An emergency spillway shall be constructed at each pond with a
finished invert elevation approximately 2 -0 feet lower than the crest
and a base width of 6.0 feet. The spillway shall be armored with 6"
angular rlprap place on 6- inches of sandy - gravel bedding and a layer
of Mirifr drain fabric.
a '
h'1 b
bb�
,
i
j
go
' w
Total Earthwork
Balanced CutlFill -3,000 Cy
North Interceptor at
Toe ofECOSA
\\ \, South Interceptor
\ at Toe of embankment
EMP -020
Plan View
1 " =50' (D -Size Dwg)
-- Grassy Valley Storm Water Management Area Transfer Pumps - I8
Wild Horse Extension (WHEX) and ECOSA gpm Solar &One cfs
Temporary. Basin MI obile @ 100 ft
TDH
Basin
WHEX-81 - Vindicator
WHEX -A Basin
Basin -- V Basin
lN -A1
WHEX -D
;[Basin EMP -018
WHEX - -C 5.7AF
EMP -010 Temporary *40 m m m o o m s o m~ EMP -013 Spillway
■ 1.8 AF
19AF Basin ■
- -_ WHEX-E Spillway ■
EMP -019 = J ■ After WHEY
9.9AF ■ Backfill, Grassy
■ Valley is Restored &
to Basin M/ Highway Basins
Pond ECOSA_A1 �� Perforated ■ Flow Direct to
Perforated Weep Pipe ■ Grassy Leek
Weep Pipe _- EMP-06 Drain 0 -- n/o Detention
Drain - - -�- 5.2 AF ■ Basin
■ ECOSA-E1
■
Clay
Basin ■
Area ECOSA-Bt ■ Spillway
■ EMP -020 -'
Sed Ewip -017 Basin ■ 9.0 AF
Tra 19J AF way ECOSA-D 1 ■
[Cos4­C I
-------- - - - - --
Upper Grassy Valley Storm Water Management Area
(�O)Schernatic
A.
�
t�
Existing EMP -016
Verify Capacity at
5.2 Acre feet
�� !M \�\\\Z\
Existing
Riprap Lined
Channel
from EMP -10 \
Construct Perforated Riser
Spillway -6'0Pipewith `
ea.1'oPerf @12 "Centers /
�E A
channel from NW Toe
of ECOSA Stockpile
3 Existing EMP -016
Plan View
1 " =50' (D -Size Dwg)
Total Earthwork
BalancedCuty9 -16,0001
Pond Capacity 9Acre Feet
Riprap Emergency
Spillway
10240, I�YdP- 18
� h
10160
10200 l L Natural Slope
Natural �! Cut through _ -9
9 R
Slope -- WHEX Mine Area Backfill - Ridge -
10 120 �
10080
10040 -
100 cfl r\ r\ o rn o 0 o rn t� co of co
Q
DATUM EL �. � _ N N � o,
ti n O O O O O O
9950.00 0 0 0 0 0 0 0 Q1 0 0 o O o 0 0 0 Q1 0 0 0
0 +00 5 +00 10 +00 15 +00 20 +00 25 +00 30 +00 35 +00 40 +00 45 +00
PROFILE B, SHEET 3- Reconstructed Stream Corridor Across WHEX after Backfill
Profile View
1" =500 ft (DSize)
6 "0 Riser Pipe
15' 6 ea. 1 "0 Holes at
(non') 12" Vertical Centers
Crest Area (Ac) - 2 ft. (typ)
-
i � 1
;J
� T ,
�T T
spilhvay
Elevation
Base Area (Ac)
Sediment Allowance 1
(2 ft. typ) Pond Dimensions
S illlwa
SEDCAD EMP- epth Area Area Capacity Outlet E Spillway P Y
Structure Name Base Crest @Crest Pipe Width Ellev.
ID (ft) (Ac) (A c) (A Fl) (in) (ft)
4 EMP -18 15 .22 .55 5.7 6'S 6 10204.0
7 EMP -10 10 .20 .55 3 -9 None 6.0 101125.0
9 EMP -19 10 .375 1.72 9.9 6 7P 6.0 100155.0
11 EMP -16 15 .21 .76 5.2 60P 6 101039.0
15 EMP -17N 8 .131 .283 1.6 12 HS 10.0 101018.0
16 EMP -17M 15 .88 1 -57 19.7 None 6.0 9989 -0
S2 EMP -2o 15 .39 .84 9.0 None 6.0 95742.5
V1 EMP -13 10 10 .27 1 -8 None 6.0- 101100.0
Notes:
1. Select Ponds include outlet risers consisting of 6" HDPE Pipe and
1,0 perforations, 6 per row, at 12 -inch intervals.
2. Pond sizes include 2 ft. deep allowance for sediment accumulation.
3. Emergency Spillways are generally 24- inches below Crest.
4. EMP Ponds with Perforated Outlet drains are not terminal facilities
and may be designed for one 10- yr /24 -hr storm volume since their
.� nre no tnmatir,,1lv evacuated to a terminal storage basin.
Depth
- 2 11
Width
Bedding: Mirifi Drain Fabric
or 6" well graded cobble
to sand crushed stone.
Channel Dimensions
Fbd
6 " +HV@
Q1oo-24
SEDCAD hannel
10 -Yr
100 yr
Avg.
\
670 HDPE
Chan.
SDR17Pipeline
Channel Name
Replaced with Open
rest
Ditch after WHEX
- .
ishackSll ed� ■� ■� -
Depth
D50(n0m)
ID
pump Station -
Normal Withdrawal 0 -7Acre feet
(cfs)
with 3 -Solar Pumps in Par"U"
�7a 0 psi
IOyrStormwithdrawal2.liAcrefeet
r Storm
1 WH -A
usingMobile/Diesel20UPPump
17
at 1 cfs/110 ft TDH it
l00,
4
ea
rEmergency Spillway for EMP -
Backt7owfrom Pond through Ditch
Total Earthwork
Balanced Cut7Fi11- 8,200 CY
6 "C4 Riser Pipe
Spillway with
6- 1 "0 Perforations
at12 "centers
Cut 4itbelow `
grade and build 5
Embankment
to Elee 1005 -s to
provide 9.9 Acre feet
Capacity y _
Note: EMP-019 is
Temporary and will be
removed by WHEX It will
be replaced after WHEX
Backall with Permanent
2 EMP -019
Plan View
v,=501 (D-Size Dwg)
EMP- 017N- Coarse Sediment - -
nee Trap - UpgradeExistingpond
nee %j
ded. Pond wig all Saa nd �// � EMP- 017Main - Rehabilitate
and coarse Silt BasingB -1, C -1 and Existing Cameron Pond for Total
ounall from EMP -016 Capacity of 19.7 Acre Feet. Pond
Designed for Sediment Removal serves as Clear -water pool and
efficiency. Eu source for dust - control &
construction water
12" Outlet Riser with
Inlet at El. 10014. Routes a 6 V
and reduces flow to EMP- 01 9Main
to 6 cis for effectiveness proved settling
6" Low level
Drain and R'prapo
100-yr Spillway to Pump System
- - -- Spillway
EMP -17 Clear-water Pond Evacuate EMP -017 and use / od
- Grass -lined Interceptor water for Dust Control �� \
for Basin ECOSA -C1 _ -
S EMP- 017S - Coarse
\ Sediment Trap for Basin ECOSA-D1 From Basin
Existing pond upgraded as ECOSA -DI 1, 1
necessary.
EGO \
i
EMP -017 (Rebuilt Cameron Ponds)
4 Plan View
V =50' (D -Size Dwg)
Notes and Genera! s7ecifications:
1. The dimensions and construction of ditches are listed on Tables at
right, along with the armoring requirements (3" Riprap, 6" Riprap or
vegetated channels). The freeboard includes a minimum of 6- inches
at the 100 year calculated discharge plus the velocity head depth.
2. EMP Ponds and their embankments are intended to be water tight
because of their proximity to high walls of the mining areas.
Accordingly, they shall be constructed to conform to the following
general specifications:
a. Strip the footprint of the pond area down to suitable non - organic
soils with no less than 15 -20% fines ( <200 mesh). Proof roll the
footprint and compact as needed to achieve a target density of no less
than 90% in the basin and no less than 95% Std. Proctor in the
embankment
b. Select soils for the embankment that have at least 15% fines.
Place and compact the embankment soils in 8 -inch maximum loose
layers and compact to at least 95% Std. Proctor density.
c. Maximum slope of embankment shall be 2 :1. Maximum slope
inside sediment basin shall be 1.75:1. Maximum slope of reseeded
areas shall be 3:1.
3. An emergency spillway shall be constructed at each pond with a
finished invert elevation approximately 2 -0 feet lower than the crest
and a base width of 6.0 feet. The spillway shall be armored with 6"
angular rlprap place on 6- inches of sandy - gravel bedding and a layer
of Mirifr drain fabric.
a '
h'1 b
bb�
,
i
j
go
' w
Total Earthwork
Balanced CutlFill -3,000 Cy
North Interceptor at
Toe ofECOSA
\\ \, South Interceptor
\ at Toe of embankment
EMP -020
Plan View
1 " =50' (D -Size Dwg)
-- Grassy Valley Storm Water Management Area Transfer Pumps - I8
Wild Horse Extension (WHEX) and ECOSA gpm Solar &One cfs
Temporary. Basin MI obile @ 100 ft
TDH
Basin
WHEX-81 - Vindicator
WHEX -A Basin
Basin -- V Basin
lN -A1
WHEX -D
;[Basin EMP -018
WHEX - -C 5.7AF
EMP -010 Temporary *40 m m m o o m s o m~ EMP -013 Spillway
■ 1.8 AF
19AF Basin ■
- -_ WHEX-E Spillway ■
EMP -019 = J ■ After WHEY
9.9AF ■ Backfill, Grassy
■ Valley is Restored &
to Basin M/ Highway Basins
Pond ECOSA_A1 �� Perforated ■ Flow Direct to
Perforated Weep Pipe ■ Grassy Leek
Weep Pipe _- EMP-06 Drain 0 -- n/o Detention
Drain - - -�- 5.2 AF ■ Basin
■ ECOSA-E1
■
Clay
Basin ■
Area ECOSA-Bt ■ Spillway
■ EMP -020 -'
Sed Ewip -017 Basin ■ 9.0 AF
Tra 19J AF way ECOSA-D 1 ■
[Cos4­C I
-------- - - - - --
Upper Grassy Valley Storm Water Management Area
(�O)Schernatic
A.
�
t�
Existing EMP -016
Verify Capacity at
5.2 Acre feet
�� !M \�\\\Z\
Existing
Riprap Lined
Channel
from EMP -10 \
Construct Perforated Riser
Spillway -6'0Pipewith `
ea.1'oPerf @12 "Centers /
�E A
channel from NW Toe
of ECOSA Stockpile
3 Existing EMP -016
Plan View
1 " =50' (D -Size Dwg)
Total Earthwork
BalancedCuty9 -16,0001
Pond Capacity 9Acre Feet
Riprap Emergency
Spillway
10240, I�YdP- 18
� h
10160
10200 l L Natural Slope
Natural �! Cut through _ -9
9 R
Slope -- WHEX Mine Area Backfill - Ridge -
10 120 �
10080
10040 -
100 cfl r\ r\ o rn o 0 o rn t� co of co
Q
DATUM EL �. � _ N N � o,
ti n O O O O O O
9950.00 0 0 0 0 0 0 0 Q1 0 0 o O o 0 0 0 Q1 0 0 0
0 +00 5 +00 10 +00 15 +00 20 +00 25 +00 30 +00 35 +00 40 +00 45 +00
PROFILE B, SHEET 3- Reconstructed Stream Corridor Across WHEX after Backfill
Profile View
1" =500 ft (DSize)
6 "0 Riser Pipe
15' 6 ea. 1 "0 Holes at
(non') 12" Vertical Centers
Crest Area (Ac) - 2 ft. (typ)
-
i � 1
;J
� T ,
�T T
spilhvay
Elevation
Base Area (Ac)
Sediment Allowance 1
(2 ft. typ) Pond Dimensions
S illlwa
SEDCAD EMP- epth Area Area Capacity Outlet E Spillway P Y
Structure Name Base Crest @Crest Pipe Width Ellev.
ID (ft) (Ac) (A c) (A Fl) (in) (ft)
4 EMP -18 15 .22 .55 5.7 6'S 6 10204.0
7 EMP -10 10 .20 .55 3 -9 None 6.0 101125.0
9 EMP -19 10 .375 1.72 9.9 6 7P 6.0 100155.0
11 EMP -16 15 .21 .76 5.2 60P 6 101039.0
15 EMP -17N 8 .131 .283 1.6 12 HS 10.0 101018.0
16 EMP -17M 15 .88 1 -57 19.7 None 6.0 9989 -0
S2 EMP -2o 15 .39 .84 9.0 None 6.0 95742.5
V1 EMP -13 10 10 .27 1 -8 None 6.0- 101100.0
Notes:
1. Select Ponds include outlet risers consisting of 6" HDPE Pipe and
1,0 perforations, 6 per row, at 12 -inch intervals.
2. Pond sizes include 2 ft. deep allowance for sediment accumulation.
3. Emergency Spillways are generally 24- inches below Crest.
4. EMP Ponds with Perforated Outlet drains are not terminal facilities
and may be designed for one 10- yr /24 -hr storm volume since their
.� nre no tnmatir,,1lv evacuated to a terminal storage basin.
Depth
- 2 11
Width
Bedding: Mirifi Drain Fabric
or 6" well graded cobble
to sand crushed stone.
Channel Dimensions
Fbd
6 " +HV@
Q1oo-24
SEDCAD hannel
10 -Yr
100 yr
Avg.
Bottom
Flow
Chan.
RipRap
Channel Name
Flow
Flow
Slope
Width (ft)
Depth
Depth
D50(n0m)
ID
(cfs)
(cfs)
(%)
(ft)
1 WH -A
9
17
5.8
4
1.5
2.6
3
2 WH -B
14
27
3.1
4
.7
1.5
3
3 WH -C1
6
15
7.0
4
.6
1.5
3
WH -C2
23
44
8.0
4
1.0
2.3
6
6 WH -D
22
46
10.7
7
0.8
2.0
6
8 WH -E
60
120
3.3
6.5
1.8
3.0
6
WH -F
2.5
3.4
5.0
4
0.5
1.5
6
Pipe MP -18
1
1
6 PE
10 EC -A
20
45
4.2
4
1.1
2.3
6
12 EC -B
55
106
11.5
6
1 -4
3 -1
6
Pipe EC -C
6
6
8
12'PE
13 ED -G
10
26
1.4
4
.9
1.7
6
14 EC -D
10
21
1.4
4
.9
1.7
6
S1A EC -E
21
42
4.7
4
1.1
2.3
6
SIB ED -F
41
84
4.7
8
1.1
25
6
V1 - Vi -A
10
36
25
6
0.6
2.1
6
8 EMP- Pond Dimensions C-)Table
Channel Dimensions and Design Specifications
Table
- - - Cameron Ponds J -
- EMP -17
-- � _ - 6tt HDPE Pi eline -
_ - - Runoff p
Brow Ditch along County Road from EMP -18 to
Reconstructed to i
Crest of WHEX Mine Area - - EMP -16 (SDR17) - EMP -19
10320 Receive water from all
10280 ,� i _ , ; - - ----" --- ------ [exlshng] EMP -'s for reuse as
10240 -; 2 „ Vent Construction Water
at
10200 -
10160 - High Point EMP-16
10120 EMP -18 with 7.5 HP
[existing]
10080 Transfer Pump
10040 M o 0 M <r I'- � N o K o N `o -a - - - -6 - -- U3 L6 L6 K L6 o o � o
cfl N d ai o N c6 ci co N N o °j °p
DATUM EMOV ° ni ai ad co R o 0
e� N N N O O_ O_ A � O O O O O O O
0 0 0 0_ o_ o o_ o_ o_ o_ o_ o o_ o_ _o �
9980.00 0 0 0 0 0 0 o O_ O o_ o 0 0 _
A +00 20 +00 25 +DO 30 +00 35 +00 40 +00 45 +00 50 +00 55 +00 60 +00 65 +00 70 +00 75 +00 80 +00
0 +00 5 +00 10+00 15
-
dO
C�)P ROFILE A SHEET 3- Grassy Valley Storm Water Channel and EMP- Ponds Steffens and Associates
Profile View Cresson Mine psw5 Water Resources - Emdronmental - Mining Ens
1 " =500 ft (DSize) Near victor CO Golden CO 80403 -0: 303.21 L1801 -C: 303.;
net lsreru>♦es. Yfr. _