2012-06-08_PERMIT FILE - C2009087A ‎(12)‎

• Permit No: C2009087A
• IBM Index Class Name: Permit File
• Doc Date: 6/8/2012
• Doc Name: DRAINAGE AND SEDIMENT CONTROL PLAN
• Section_Exhibit Name: Exhibit 2.05.3-E2 Drainage and Sediment Control Plan
• Media Type: D
• Archive: Yes

Peabody Sage Creek Mine - Drainage and Sediment Control plan
TABLE 2.05.3 -E2 -7
Postmine Channel Design Schedule
(cont d)
Seneca II Mine
Postmine
Slope
Bottom
Side
Design
Ditch
Design Flow
Design Flow
( %)
Width
Slope
Velocity
Flow Depth
Design Depth
Lining Type ''8'9
cfs 1'Z
cfs 3
11
H:1
(fps) 4
ft 5
ft 6
PM -17
1.0
1.0
2-8
2
3
1.6
0.8
1.1
Vegetated
9-13
3.8
0.2
0.7
Gravel
PM -18
1.0
1.0
8-20
2
3
4.4
0.2
0.5
Gravel
PM -19
1.0
1.0
9-21
V -ditch
3
1.4
0.7
1.0
Vegetated
PM -20
36
1.0
11-22
2
3
8.9
1.0
1.3
D5o = 9"
23-27
9.1
0.9
1.2
D50 = 12"
PM -21
1.0
1.0
4-22
V -ditch
3
2.8
0.9
1.2
Vegetated
PM -22
1.0
1.0
10-14
2
3
3.9
0.1
0.4
Gravel
PM -23
1.0
1.0
7-20
V -ditch
3
1.4
0.8
1.1
Vegetated
SCM -1
n/a
60.4
5.7-30
10
3
8.7
0.8
1.1
D50 = 9"
SCM -2
n/a
34.2
2.0-4.0
10
3
4.5
1.3
1.6
Vegetated
SCM -3
n/a
1.8
0.5-5.5
1
3
2.0
1.5
1.8
Vegetated
SCM -4
n/a
1.9
5.0-26
3
3
2.9
0.6
0.9
Vegetated
SCM -5
n/a
1.0
1.0 - 13
3
3
1.7
0.9
1.2
Vegetated
RA-1-131
n/a
1.0
0.6
1
3
0.6
1.2
1.5
Vegetated
R13-131
n/a
2.0
0.5-3.0
V -ditch
3
1.6
1.7
2.0
Vegetated
RE -Dl
n/a
1.0
0.5
V -ditch
3
0.6
1.4
1.7
Vegetated
Notes: 1) Seneca II Mine Design Flow from Seneca II Mine Permit, C- 1980 -005, Tab 3, Appendix 7 -12, Postmining Drainage Control.
2) Design flow from SEDCAD4 modeling; minimum deign flow = 1.0 cfs.
3) Postmine design flows for PM -1, SCM -1 and SCM -2 use the 100 -year, 24 -hour storm event (Rule 4.05.4); all other
channels designed for the 10 -year, 24 -hour storm event
(Rule 4.05.3).
4) Design velocity based on maximum grade (using Retardance Class D for vegetated channels).
5) Flow depth based on minimum grade (using Retardance Class B for vegetated channels, unless otherwise
noted).
6) Design Depth = flow depth plus freeboard (0.3 feet).
7) Rock riprap sized using PADER Method; design DS0 = SEDCAD value plus three (3) inches, unless otherwise noted.
8) Riprap D50= 3- inches represents typical gravel found on -site.
9) Gravel Lining represents 3 -inch minus material.
10) PM -3U is the ditch reach down to the confluence with PM -19.
11) PM -3M is the ditch reach from the confluence with PM -19 to Stock Tank T33.
12) PM -3L is the ditch reach from T33 to the ditch outlet.
13) PM -4U is above Stock Tank T28.
14) PM -4M is the ditch reach from T28 to the confluence with PM -16.
15) PM -4L is the ditch reach from PM -16 to the confluence with PM -6.
16) PM -6U is the ditch reach above PM -6b.
17) PM -6M is the ditch reach from the confluence with PM -6b to where PM -7 joins the ditch.
18) PM -6MM is the ditch reach from PM -7 to where PM -20 joins the ditch.
TR -0)r- 2.05.3 -E2.17 Revised 04/12