2012-02-28_REVISION - M1980244 ‎(4)‎

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

v )
i
I
1 EMP -018
Plan View
1 " =50' (D -Size Dwg)
E�.
9
c� pSP
EGB
\
6'0 HDPE
. , A SDR171rpeline
Ctest 15 Replaced with Open _
Ditch after WHEX
fslrL --
is backfrl/ed -
4i
i� Pump Station -
"M�" � � Normal Withdrawal 0.7Acrefeet
030 with 3 -Solar Pumps in Parallel
�� �p g0 , C7 5gpm /40 psi
N N(§ _ ` , 1 rStorm withdrawal 2.6Acre feet
l using Mobde/Die e120 HP Pump
at 1 cfs 1110 it TDH it -
�ey tjfo
Emergency Spillway for IMP- x N�ing
Backflow from Pond through Ditch N
7 Total Earthwork
Balanced Cut7FX - 8,200 CY
6 "0 Riser Pipe
Spillway with
6- 1 "O Perforations
at12 "centers
o�
Cut 4ft below
grade and build
Embankment
to Elev. 10055 to
provide 9.9 Acre feet
Capacity
Note. EMP -019 is
d will be `
Temporary an Y
removed by WHEX. It will s
be replaced after WHEX ^Y
Backtill with Permanent \ ;
EMP -019
3
2 EMP -019
Plan View
1"=50'(D-Size Dwg)
EMP- 017N- Coarse Sediment
Trap Upgrade Existing pond as
needed. Pond wlVremove all Sand
and coarse Silt Basing B-1, C -1 and 'EMP- 017Main - Rehabilitate
outfall from EMP -016 o Capacity Cameron Pond for Ton
8s Capacity of 19.7Acre Feet. ,Pond
Designed for Sediment Removal �J �ydD 6' serves as Clear -water pool and
effieieacy Eu f a - source for dust - control &
6
construction water,
12" Outlet Riser with y o�
Inlet at El. 10014. Routes �6
and reduces flow to EMP- 019Main
to 6 tivmproved settling
effecenes
100 yr Spillway to Pump System to
EMP -17 Clear -water Pond Evacuate EMP -017 and use
Q
-Grass - linedInterceptor water for Dust Control and
forBas ri ECOSA-CI Construction water
W" EMP - 017S - Coarse
Sediment Trap for Basin ECOSA-DI From Basin
Existingpond upgraded as ECOSA-DI
necessary.
Ew ^-
t
1
4 EMP -017 (Rebuilt Cameron Ponds)
Plan View
1"=50'(D-Size Dwg)
Notes and General Specifications:
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 shat/ 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
embankmant.
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 nprap place on 6- inches of sandy- gravel bedding and a layer
of Mirifi drain fabric.
I
I
�� II
I / 6 Low -level
Diaia and Riprap
.Spilhway
0
s'6, 1 /
10 1
rn
I
Temporary--
ti o rn o o
;
Basm
rn co
r:
DA7 U1VL FLF
_ m � _ �_�
WHEX -D
cD N co ai cfl
-��_ tr N
-��i
0 0
- 9950.00 O O O
Basin
�I
', WHEX -i
EMP -010
Tea
E«
g
h1 b
CIO b'
o�
MIN
CS
i
r
1
Total Earthwork
Balanced d Cut/Fill -3,000 CY
North Interceptor at
Toe ofECOSA
South Interceptor
at Toe ofECOSA embankment
EMP -020
Plan View
1 "=50'(D-Size Dwg)
Grassy Valley Storm Water Management Area Transfer Pumps - 18
Wild Horse Extension (WHEX) and ECOSA gpm Solar z One cis
Basin Basin Mobile @ 100 ft TDH
IHEX - -A WHEX -B Vindicator
Basin
�VINAI Basin
EMP -018 T
5.7AF
3.9 AF Basin
'� ------ - - - - -- WHEX-.
toe Basin
Pond ECOSA-A1
�_..
Perforated
Weep Pipe
Dram --
Clay Basin
Area ECOSA-Bl
Basin 1
ECOSA-Cl
''BMMMOMn •MME EMP -013 Spillway
■ 111, 1.8 AF
■
Spillway
EMP -019 ■ After WHEX
9.9 AF ■ / Backfill, Grassy
■ / Valley is Restored
■ Highway Basins
Perforated ■ Flow Direct to
V� Weep Pipe 0 Grassy Creek
MP -016 Drain ■ w/o Detention
5.2AF - �`- Basin
0 ECOSA-E1
■
■
■ EMP 020
Spillway ■
:EC asin ■ OAF
way SA-D1
■ J l
I A1
O Upper Grassy Valley Storm Water Management Area
10
i
EadstingEMP -016
Verify Capacity at
`� l9 5.2 Acre feet,
� 1
Existing
O
Riprap Lmed
Channel `
from EMP 10 \ 1
Construct Perforated Riser oo
Spillway - 670 Pipe with `
6 ea. 1' O Perf. @ 2" Centers -'
EC�
Channel from NW Toe
ofECOSAStockpile
Existing EMP -016
3 Plan View
1 " =50' (D -Size Dwg)
i
1024 10200 �t
10160 Natur.
10120 Slope
10080
10040
WHEX Mine Area Backflll
Cut through
Ridge
Natural Slope
100K ca
ti o rn o o
r o rn
� co r- N rn
rn co
r:
DA7 U1VL FLF
_ m � _ �_�
- % tri
rn
cD N co ai cfl
-��_ tr N
-��i
0 0
- 9950.00 O O O
A c
O O O O Cl) O O
N X,
O O O
`" ti o 0 0 0
o O O O O O
O O
6'S
6
10204.0
7
EMP -10
0 +00 5 +00 10 +00 15 +00 20 +00 25 +00
30 +00 35 +00 40 +00
45 +00
7 PROFILE B, SHEET
3- Reconstructed Stream
Corridor Across
WHEX after Backfill
9
Profile View
10
.375
1.72
9.9
1" =500 ft (DSize)
6..0
10055.0
11
EMP -16
Total Earthwork
Balanced Cut/Fill- 16,000CY -6"0 Riser Pipe
Pond Capacity 9Acre Feet 15' 6 ea. 1 "0 Holes at
12" Vertical Centers
(nom
p� -Crest Area (Ac) 2 ft. (typ)
��'�. Spillway
- Elevation
I I I I 1 I
- -Base Area (Ac) \
1 Sediment Allowance
I (2 ft. typ) Pond Dimensions
Riprap Emergency
Spillway
SEDCAD
Structure
ID
EMP -
Name
Depth
(ft)
Area
Base
(Ac)
Area
Crest
(Ac)
Capacity
@Crest
(Ac -Ft)
Outlet
Pipe
(in)
E Spillway
Width
(ft)
Spillway
Elev.
4
18 EMP
15
22
.55
5.7
6'S
6
10204.0
7
EMP -10
10
.20
.55
3.9
None
6..0
101250
9
EMP -19
10
.375
1.72
9.9
67
6..0
10055.0
11
EMP -16
15
.21
76
5.2
67
6
10039.0
15
EMP -17N
8
.131
.283
1.6
12 "S
10.0
10018.0
16
EMP -17M
15
.88
1.57
19.7
None
6-0
9989.0
S2
EMP 20
15
.39
.84
9.0
None
6 -0
9942.5
V1
EMP -13
10
.10
.27
1.8
None
6.0
10100.0
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
Depth
2
1
Width
Bedding: Mirifi Drain Fabric
or 6" well graded cobble
to sand crushed stone.
Channel Dimensions
Fbd
6 " +HV@
Q100 -24
SEDCAD
Channel
ID
3hannel
Name
10 -Yr
Flow
(cfs)
100 yr
Flow
(cfs)
Avg.
Slope
( %)
Bottom
Width (ft)
Flow
Depth
(ft)
Chan.
Depth
(ft)
MpRap
D50(nom)
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
70
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
20
6
8
WH -E
60
120
3.3
6.5
1.8
3.0
6
WH -F
2.5
3.4
50
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
SIA
EC -E
21
42
4.7
4
1.1
23
6
SIB
ED -F
41
84
4.7
8
1.1
2.5
6
V1
VIA
10
36
25
6
0.6
21
6
contents are automatically evacuated to a terminal storage basin.
(EMP- Pond Dimensions �bChannel Dimensions and Design Specifications
� )Table
Runoff from 6tt HDPE Pipeline EMP-1 7
Brow Ditch along Cameron Ponds
Crest of WHEX Mine Area County Road from EMP -18 to Reconstructed to
10320 EMP -16 (SDR17) EMP -19
10280 - ---- - -- -- - - - - -- existin Receive water from all
10240 ~ } [ g] EMP- s for reuse as
L tt Construction Water
1 0200 2 Ven tat
10160 High Point EMP -16
10120 �
EMP -18 with 75 HP [existing]
10080 Transfer Pump
10040 M o 0 0 rr o N o r. o N o -- - -- o
o M o co M o N
cd (:6 116 1.6 i o
A 7,Uy L,M� ° v-: a5 r aS oo cd K er 0
M M N N N N N ti N N N N N N N ( n Q o o O o o O o 0 0 o O
9980.00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
� n n n n n P t` n n n ti n ti n !�
0 +00 5 +00 10 +00 15 +00 20 +00 25 +00 30 +00 35 +00 40 +00 45 +00 50 +00 55 +00 60 +00 65 +00 70 +00 75 +00 80 +00
PROFILE A SHEET 3- Grassy Valley Storm Water Channel and EMP- Polnds
Profile view Steffens and Associates
1" =500 ft (DSize) Cresson Mine1%u6nc-",
Water Resources - Environmental - Mining Eng