2013-02-01_HYDROLOGY - C1994082 ‎(2)‎

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 2/1/2013
• Doc Name: 4th Quarter 2012 Sedimentation Pond Inspection Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Email Name: JLE
• Email Name: SB1
• Media Type: D
• Archive: No

INSPECTOR'S NAME: Dennis Jones
NPDES I.D. NO.: CO- 0000221 D.P. 011
FACILITY CONFIGURATION: Cross - Valley Pond
SITE NAME: Pond #011
MINE NAME: Yoast Mine(Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C -94 -082
PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil:
2. Lift thickness:
3. Compaction according to approved plan:
4. Burning (specify extent and location):
5. Angle of slope: 3.0:1 upstream, 2.8:1 downstream
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes:
At isolated points on embankment slopes:
At natural hillside:
Over widespread areas:
From downstream foundation area:
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
"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: see below
*Erosion of toe:
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
19. *Cracking or crushing of pipes
Spillway pipes:
Decant system:
20. Trash racks clear and in place:
21. Discharge rate (gpm) £ R' QVn 'eve_ g ee
DATE: f / 1 : 1 Z /39 10- (c( -1 2.
DATE LAST INSPECTION: q--(6- )2
LOCATION: NE'% SW',,, Sec. 16, T5N, R87W
LOCATION: 8.5 mi. SE of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
*Water impounded against toe:
Existing embankment freeboard: (normal = 5.1')
Increase 0/ Decrease in water level:
Cracks, bulging, or erosion on upstream face:
Yes
8 in.
Yes
No
Total = 5.8:1
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
0
Ip
0
No
No
N•
3 feet
feet
Yes N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes E9 N/A
N/A
N/A
Yes To N/A
N/A
6 No N/A
•_) to l_e 0
*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.