HYDRO29931

• Permit No: C1994082
• IBM Index Class Name: Hydrology
• Doc Date: 10/20/2006
• Doc Name: 3rd Quarter 2006 Sedimentation Pond Inspections
• 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 Impoundments
INSPECTOR' S NAME: Dennis Jones DATE: ~' S '~ V
NPDES I.D. NO.: CO-0000221 D.P. 011 ^ ' - /
FACILITY CONFIGURATION: Cross-Valley Pond DATE LAST INSPECTION:
SITE NAME: Pond #011 LOCATION: NE'/, SW+/,, Sec. 16, TSN, R87W
MINE NAME: Yoast Mine (Seneca Coal Co) LOCATION: 8.5 mi. SE of Hayden, CO
MINE I.D. NO.: CMLRD Permit No. C-94-082 OWNER'S REP.: Greg g Kitchen Gen Mar
C1ICle Or Wrlto 1n apDTODr].a to IeBDOIISe
1
2
3
4
5
6
7.
8.
9.
10
11
12
13
14
15
16
17
18
19
20
Foundation preparation (removal of vegetation, stumps, topsoil
Lift thickness:
Compaction according to approved plan:
Burning (specify extent and location):
Angle of slope: 3.0:1 upstream, 2.8:1 downstream
*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 on hillside:
*Erosion of toe:
*Water impounded against toe:
Existing embankment #reeboard: (normal = 5.1~)
Increase / Decrease in water level.:
Cracks, bulging, or erosion on upstream face:
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
*Cracking or crushing of pipes
Spillway pipes:
Decant system:
Trash racks clear and in place:
Yes
8
Yes
No
Total
in.
5.8:1
Yes N
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Yes No
Lb feet
T feet
Yes No
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
N/A
Yes ~ N/A
_ NL?a
_ NL
Yes ® N/A
Y s 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.