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.: 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
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PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
DATE: g (0-(
Circle or write in appropriate response
DATE LAST INSPECTION: C l - Z l
-12
LOCATION: SW NWl /,, Sec. 16, T5N, R87W
LOCATION: 8.5 mi. SE of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness:
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: (JQUy Iat..3.5En04 , Vv -0,.. J4.5cLtivlp 1 4 :
At isolated points on embankment slopes: Yes N/A
At natural hillside: Yes N/A
Over widespread areas: Yes N/A
From downstream foundation area: Yes N/A
"Boils" beneath stream or ponded water: Yes N/A
Cracks or scarps on crest: Yes N/A
Cracks or scarps on slope: Yes N/A
Sloughing or bulging on slope: Yes N/A
*Major erosion problems: Yes N/A
Surface movements in valley bottom or on hillside: Yes N/A
*Erosion of toe: Yes N/A
*Water impounded against toe: Yes N/A
Existing embankment freeboard: (normal = 4.5') 5 2, feet
Increase ✓ Decrease in water level: O•'2, feet
Cracks, bulging, or erosion on upstream face: Yes 0 N/A
N/A
'No1
No
No
No
No
No
No
No
No
No
No
• N&
in.
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels and pipes: Yes 6 N/A
Decant system: N/A
Diversion ditches: N/A
19. *Cracking or crushing of pipes
Spillway pipes: Yes N6
Decant system: N/A
20. Trash racks clear and in place: No
21. Discharge rate (gpm) L sdv., leu.l 0.1 cetQA be(v�a GI4samc,i1 2 d
*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 ALLOWABLE SEDIMENT LEVEL IS 2.1 FEET BELOW TOP OF SPILLWAY PIPE
SeA le_ u 4 4 a • ( 4 e—t ce- 10 , � o —(3(
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