2012-11-05_HYDROLOGY - C1994082

• Permit No: C1994082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/5/2012
• Doc Name: 3rd Quarter 2012 Sedimenation 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

PERIODIC INSPECTION FORM
Water, Sediment, or Slurry Impounndments
INSPECTOR'S NAME: Dennis Jones DATE: ( N
NPDES I.D. NO .: N/A � _ � � ` I
FACILITY CONFIGURATION: Cross - Valley Pond DATE LAST INSPECTION:
SITE NAME: Pond #012A LOCATION: NE'% NE /,,Sec. 19, T5N, 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.: Roy Karo, Gen Mgr
Circle or write in appropriate response
1. Foundation preparation (removal of vegetation, stumps, topsoil: Yes
2. Lift thickness:
3. Compaction according to approved plan:
4. Burning (specify extent and location):
5. Angle of slope: upstream,
6. *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: see below
"Boils" beneath stream or ponded water:
Cracks or scarps on crest:
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
Cracks or scarps on slope:
Sloughing or bulging on slope:
*Major erosion problems: $ eQ (,Q t
Surface movements in valley bottom or on hillside:
*Erosion of toe:
*Water impounded against toe:
Exiting embankment freeboard: (4.6' when full)
Increase Decrease in water level • '-- 5, - - b4.5i
Cracks, bulging, or erosion
on upstream face:
Visible sumps or sinkholes in slurry surface:
*Clogging
Spillway channels and pipes:
Decant system:
Diversion ditches:
in.
Yes
No
downstream Total =
Yes
Yes
Yes
Yes
Yes
Yes
Yes
N/A
Yes
N/A
N/A
6. Spoil spring at north end of dam toe, appears to not causing a problem.
1 0 _ s V y t'e cc- c- "Lac. %A. in. , a_ S to €_[ o L.) G¢.t ._ o X c loo
8 1„a h e•eck O Vt MJ caw` i 5 k
No
0
No
Yes
Yes
es
Yes
Yes
Yes
-f eet
im.S ec ∎fly feet
f Yes ^
No
N
No
19. *Cracking or crushing of pipes
Spillway pipes: Yes 60
Decant system: N/A
20. Trash racks clear and in place: 6e2 No
21. Discharge rate (gpm) k) c4 ku k (e.).o..A 14242(Dc,) C.�osc�jQ
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
N/A
N/A
*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.