2012-08-30_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/30/2012
• Doc Name: 2nd Quarter 2012 Sedimentation Inspection
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Email Name: SLB
• Email Name: SB1
• Media Type: D
• Archive: No

INSPECTOR'S NAME:
NPDES I.D. NO.: N/A
FACILITY CONFIGURATION: Cross - Valley Pond
SITE NAME: Pond #011A
MINE NAME: Yoast Mine(Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C -94 -082
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: in.
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 3.0:1 upstream, 3.0:1 downstream Total = 6.0:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes:
At isolated points on embankment slopes:
At natural hillside:
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
Over widespread areas:
From downstream foundation area:
"Boils" beneath stream or ponded water:
Cracks or scarps on crest:
Cracks or scarps on slope:
Sloughing or bulging on slope:
*Major erosion problems:
Surface movements in valley bottom or on hillside:
*Erosion of toe:
*Water impounded against toe:
Existing embankment freeboard:
Increase Decrease in water level:
Cracks, bulging, or erosion on upstream face:
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels and pipes: Yes
N/A
N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes Tic
Decant system: N/A
20. Trash racks clear and in place: No
21. Discharge rate (gpm) D
Decant system:
Diversion ditches:
*Major adverse changes in these items could cause instability and should be reported to
the Engineering Manager and Mine Superintendent for further evaluation. Adverse
conditions noted in these items should normally be described (extent, location, volume,
etc.) in the space on the back of this sheet.
MAXIMUM SEDIMENT LEVEL IS 2.1 FEET BELOW TOP OF SPILLWAY PIPE
1,0 .J54. waA .e_( cL) cs ,1,_c4
PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundmeents
C�v S Wl LA DATE: " L
Circle or write in appropriate response
DATE LAST INSPECTION:
LOCATION: SW'% NW' %, Sec. 16, T5N, R87W
LOCATION: 8.5 mi. SE of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
(normal = 4.5')
N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes o N/A
Yes No N/A
Yes No N/A
Yes No N/A
Yes � No N/A
Yes No N/A
Yes No N/A
Yes C N/A
Yes N/A
.S.`1 feet
feet
Yes e N/A
N/A
N/A