2010-07-28_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 7/28/2010
• Doc Name: 2nd Quarter 2010 Sedimentation Pond Inspection Pond
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: DTM
• Email Name: SB1
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Dennis Jones
NPDES I.D. NO.: CO-0000221 D.P. 013
FACILITY CONFIGURATION: Cross-Valley Pond
SITE NAME: Pond #013
MINE NAME: Yoast Mine(Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C-94-082
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Yes No
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Yes
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Yes No N/A
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Yes No N/A
,4-c. b. `( S
*Major adverse changes in these items could cause instability and should be
the Engineering Manager and Mine Superintendent for further evaluation
conditions noted in these items should normally be described (extent,
volumeetc.) in the space on the back of this sheet.
DATE : 6'' -10-
DATE LAST INSPECTION: 3 12"10
LOCATION: SEl/, NWl/,, Sec. 19, TSN, R87W
LOCATION: 8.5 mi. SE of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
Circle or write in appropriate response
Foundation preparation (removal of vegetation, stumps, topsoil: Yes
Lift thickness: in.
Compaction according to approved plan:
Burning (specify extent and location): No
Angle of slope: 3:1 upstream, 3:1 downstream Total = 6:1
*Seepage (specify location, color, and approximate volume)
From underdrain pipes: N/A
At isolated points on embankment slopes: Yes
At natural hillside: Yes g
over widespread areas: Yes

From downstream foundation area:
Sec o'k ?A S i?Q
Ye o
"Boils" beneath stream or ponded water: Yes
Cracks or scarps on crest: Yes
Cracks or scarps on slope: Yes o

Sloughing or bulging on slope:
Yes No
*Major erosion problems: Yes
Surface movements in valley bottom or on hillside: <Es? No
*Erosion of toe: Yes No
*Water impounded against toe: Ye No
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Existing embankment freeboard: (normal = 4
) feet
Increase Decrease in water level: feet
Cracks, bulging, or erosion on upstream face: Yes ®o
Visible sumps or sinkholes in slurry surface: N/A
*Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
*Cracking or crushing of pipes
Spillway pipes:
Decant system:
Trash racks clear and in place:
Discharge rate (gpm)
reported)ko
Adverse
location,