HYDRO23755

• Permit No: C1980005
• IBM Index Class Name: Hydrology
• Doc Date: 7/30/2007
• Doc Name: 2nd Quarter 2007 DMRS
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Media Type: D
• Archive: No

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry ImpCoundments
INSPECTOR'S NAME: Dennis Jones DATE: C~ - ~ '~
NPDES I.D. IQO.: CO-0000221 D.P. 004
FACILITY CONFIGURATION: Cross-Valley Pond
SITE NAME: South Section 12 Pond #004
MINE NAME: Seneca II Mine (Seneca Coal Co)
MINE I.D. NO.: CMLRD Permit No. C-80-005
DATE LAST INSPECTION: 3 -`~ ~ ~ 1
LOCATION: SW~/, SEA/. Sec 12 TSN R87W
LOCATION: 7.1 mi. SE of Hayden, CO
OWNER'S REP.: Grego Kitchen Gen Mar
Circle or write in appropri.a to re~onse
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Foundation preparation (removal of vegetation, stumps, topsoil: Yes
Lift thickness: 12
Compaction according to approved plan: ~ Yes
Burning (specify extent and location): No
Angle of slope: 5:1 upstream, 2:1 downstream Total =
*Seepage (specify location, color, and approximate volume)
From underdrain pipes:
At isolated points on embankment slopes:
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 slope:
Sloughing or bulging on slope:
*Maj or erosion problems:
Surface movements in valley bottom or o n hillside:
*Erosion of toe:
*Water impounded against toe:
Existing embankment freeboard: ( normal = 4.8')
Increase Decrease in water level: lao c~a~,y~
Cracks, bulging, or erosion on upstream face:
Visible sumps or sinkholes in slurry su rface:
*Clogging
Spillway channels and pipes:
Decant system: 4a W ~
Diversion ditches:
*Cracking or crushing of pipes
Spillway pipes:
Decant system: Inoperable
Trash racks clear and in place:
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Y~
Yes
NSA
7:1
No N/A
No N/A
No N/A
No N/A
No N/A
No N/A
No N/A
No N/A
No N/A
No N/A
No N/A
N N/A
feet
feet
No N/A
Yes ~ N/A
~~~-~:r~
Yes ~ N/A
Yes -~~ N/A
Yes FIe--F:7A
Yes No N/A
*Maj or 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.