2011-07-28_HYDROLOGY - C1982057

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 7/28/2011
• Doc Name: 2nd Quarter 2011 Sedimentation Pond Inspection Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Email Name: SLB
• Email Name: SB1
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones DATE: G 1 (
NPDES I.D. NO.: CO- 0000221 D.P. 005
FACILITY CONFIGURATION: Cross - Valley Pond DATE LAST INSPECTION: 3 - 22..
SITE NAME: Pond #005 LOCATION: NW SW %, Sec. 10, T5N, R88W
MINE NAME: Seneca II -W Mine (Seneca Coal Co) LOCATION: 8 mi. S of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C -82 -057 OWNER'S REP.: Roy Karo, Gen Mgr
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness: 12 in.
3. Compaction according to approved plan: Yes
4. Burning (specify extent and location): No
5. Angle of slope: 3.5:1 upstream, 2.5:1 downstream Total = 6:1
6. *Seepage (specify location, color, and approximate volume)
From underdrain pipes: G[ X 1 c-k1,9 IM : to
At isolated points on embankment slopes:
At natural hillside:
Over widespread areas:
From downstream foundation area: See, lea -lo 0„)
"Boils" beneath stream or ponded water:
7. Cracks or scarps on crest:
8. Cracks or scarps on slope:
9. Sloughing or bulging on slope:
10. *Major erosion problems:
11. Surface movements in valley bottom or on hillside:
12. *Erosion of toe:
13. *Water impounded against toe:
14. Existing embankment freeboard: (normal = 7.4')
15. Increase Decrease in water level: Ica c L.c k O"-
16. Cracks, bulging, or erosion on upstream face: Yes
17. Visible sumps or sinkholes in slurry surface: N/A
18. *Clogging
Spillway channels and pipes:
Decant system: Inoperable
Diversion ditches:
19. *Cracking or crushing of pipes
Spillway pipes: Yes d N/A
Decant system: Inoperable Yes No N/A
20. Trash racks clear and in place: Yes No N/A
21. Discharge rate (gpm)
Circle or write in appropriate response
Yes
Yes
Yes
No
1Vo
No
No
No
No
No
Yes No N/A
Yes 1.Y5) N/A
"7.4 feet
feet
Yes
Yes
Yes
Yes
Yes
Yes
13
Gd e . 5
p c.,
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 U N/A
Yea —PTA N/A
N/A
*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.