2011-01-11_HYDROLOGY - C1981041 ‎(3)‎

• Permit No: C1981041
• IBM Index Class Name: HYDROLOGY
• Doc Date: 1/11/2011
• Doc Name: 4th Qtr 2010 Pond Inspections
• From: J.E. Stover & Associates
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: MPB
• Email Name: SB1
• Media Type: D
• Archive: No

Page 2/2
QUARTERLY POND I NSPECTION REPORT
Operator: Snowca coal company Quarter: Fourth 2010
Permit: C-1981-041 Inspection Date: 08-Dec-10
Pond Identification 9 RSRDA 10 CRDA-2 11-CBA-2 13-North Portal SAE N Decl CBA-1
Type of Pond Sediment Sediment Sediment Sediment E/W Sums Sum
Status During Inspection: Desi n and Actual De th from S illwa Invert
Design Depth 9.0 9.0 8.0 6.0 n/a 4.4
Design Max Water Depth n/a n/a n/a n/a n/a n/a
Design Max Sed. Depth 4.3 5.3 n/a 2.0 n/a 4.0
Sediment Level 6.4 5.6/6.1 3.5 5.8 n/a 3.8
Water Level D Dry I D Dry I D D
Outflow 0 0 0 0 0 0
Features Problem Problem Problem Problem Problem Problem
Yes/No Yes/No Yes/No Yes/No Yes/No Yes/No
Erosional
Rills & Gulleys No No No No No No
Inadequate Vegetation No No No No No No
Outlet Channel Erosion No No No No No No
Burrows No No No No No No
Other No No No No No No
Structural
Differential Settling No No No No No No
Cracks or Slides No No No No No No
Seepage No No No No No No
Other No No No No No No
Appurtenant Structures
Defective Spillways No No No No N/A N/A
Dewatering Devices Clogged No No No No N/A N/A
Faulty Gates, Etc. No No No No N/A N/A
Other No No No No No No
Additional Comments Sediment level in pond 11 is about 3.5 feet below the top of the sediment poles.

Pond 11 has a
dequate capacity within the 3.5 feet to contain 25- ear eue, z" " "'?
"n
??
,

Maintenance Required: None
?f9
?? C??G-7(?
i
J
c77''
?'
??
-
6
? ?
tee € r
? ? O v 7
jZb it
%
Name of Inspector: Jim Stover 0 r"
S
A
P
J. E. Stover
Colorado P. E. 19230 Date