HYDRO29315

• Permit No: C1982057
• IBM Index Class Name: Hydrology
• Doc Date: 7/17/1998
• Doc Name: QUARTERLY SEDIMENTATION POND INSPECTIONS SENECA II-W MINE
• From: SENECA COAL CO
• To: DMG
• Permit Index Doc Type: SEDIMENT POND INSPECTIONS
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Micha 7 A7-av;77a DATE: Ofy~/29/9A
NPDES I.D. NO.: CO-0000 l D.P. 006
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION: 03~17~98
SITE NAME: Pond #006~P -ce 7;nq Rae;n LOCATION: NW'q NW1r. _cec. 79 TcN R88W
MINE NAME: Seneca 71'-W Min (ceneca oa7 07 LOCATION: 8 mi_ 5 of Hayden, CO
MINE I.D. NO.: CMi Rn p m; No -8 -OC7 OWNER'S REP.: Brad Brown. Gen Mgr
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Foundation preparation (removal of vegetation, stumps, topsoil:
Lift thickness: -.
Compaction according to approved plan:
Burning (specify extent and location):
Angle of slope: 3:1 upstream,
*Seepage (specify location, color, and
3.1 downstream
approximate volume)
From underdrain pipes:
At isolated points on embankment elopes:
At natural hillside:
Over widespread areas:
From downstream foundation area:
"Boils" beneath stream or ponded water:
Cracks or scarps on crest:
Cracks or scarps on elope:
Sloughing or bulging on elope:
*Major erosion problems:
Surface movements in valley bottom or on hillside:
12. *Eroeion of toe:
13. *Water impounded against toe:
14. Existing embankment freeboard: apprr,r;mately
15. Increase Decrease in water level: No change
16. Cracks, bulging, or erosion on upstream face:
17. Visible sumps or sinkholes in slurry surface:
18. *Clogging
19
20
Spillway channels and pipes:
Decant system:
Diversion ditches:
*Cracking or crushing of
Spillway pipes: _
Decant system:
Trash racks clear and in place:
pipes
es No
~2- in
es No
Yes No
Total = 6:1
Yee No
Yee ~10~
Yee .j~i~
Yee
Yea o
Yee
Yee
Yee (~
Yee ~°
Ye6 ®°
Yes
Yee
Yee No
l0_8 feet
feet
Yes No
Yee No
N/A
N~A
N~A
`l`L"'J
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
~A
Yes N® N A
Yee No N A
Yes ©o N/A
Yee No N A
Yee No N A
Yee No
*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 apace on
the back of this sheet.