2013-07-09_HYDROLOGY - C1982057 ‎(2)‎

• Permit No: C1982057
• IBM Index Class Name: HYDROLOGY
• Doc Date: 7/9/2013
• Doc Name: 2nd Quarter 2013 Quarterly Sedimentation Pond Inpspection 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

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impoundments
INSPECTOR'S NAME: Chris Miller
NPDES I.D. NO.: CO- 0000221 D.P. 006
FACILITY CONFIGURATION: Cross - Valley Pond
SITE NAME: Pond #006
MINE NAME: Seneca II -W Mine (Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C -82 -057
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DATE: 6 -10-13
DATE LAST INSPECTION: 10 -20 -12
LOCATION: NWT NW'-4, Sec. 22, T5N, R88W
LOCATION: 8 mi. S of Hayden, CO
OWNER'S REP.: Roy Karo, Gen Mgr
Circle or write in appropriate response
Foundation preparation (removal of vegetation, stumps,
Lift thickness:
Compaction according to approved plan:
Burning (specify extent and location):
Angle of slope: 3.5:1 upstream, 2.5:1 downstream Total =
*Seepage (specify location, color, and approximate volume)
topsoil:
From underdrain pipes:
No
At isolated points on embankment
slopes:
At natural hillside:
N/A
Over widespread areas:
No
From downstream foundation area:
(see below)
"Boils" beneath stream or ponded
water:
Cracks or scarps on crest:
No
Cracks or scarps on slope:
Yes
Sloughing or bulging on slope:
N/A
*Major erosion problems:
No
Surface movements in valley bottom or
on hillside:
*Erosion of toe:
N/A
*Water impounded against toe:
No
Existing embankment freeboard:
(normal = 7.51)
Increase Decrease in water
level: no change
Cracks, bulging, or erosion on upstream
face:
Visible sumps or sinkholes in slurry surface:
Yes
*Clogging
N/A
Spillway channels and pipes:
No
Decant system:
7.5
Diversion ditches:
*Cracking or crushing of pipes
feet
Spillway pipes:
Yes
Decant system:
N/A
Trash racks clear and in place:
No
Discharge rate (gpm)
Yes
12 in.
Yes
No
6.1
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
7.5
feet
feet
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
Yes
No
N/A
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*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.