2010-07-06_HYDROLOGY - C1981041 ‎(3)‎

• Permit No: C1981041
• IBM Index Class Name: HYDROLOGY
• Doc Date: 7/6/2010
• Doc Name: 2nd Quarter 2010 Pond Inspection Report
• From: J.E. Stover & Associates, Inc
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: MPB
• Email Name: SB1
• Media Type: D
• Archive: No

QUARTERLY POND INSPECTION REPORT
Snowca Coal Com an Quarter:
C-1981-041 Inspection Date:
Pond Identification
Type of Pond
Status During Inspection:
Design Depth
Design Max Water Depth
Design Max Sed. Depth
Sediment Level
Water Level
Outflow
Erosional
Rills & Gulleys
Inadequate Vegetation
Outlet Channel Erosion
Burrows
Page 2/3 11
Second 20101
28-Jun-10
9 RSRDA 10 CRDA-2 11-CBA-2 13-North Portal SAE N Decl CBA-1
Sediment Sediment Sediment Sediment E/W Sums Sum
9.0 9.0
n/a n/a
4.3 5.3
6.4 5.6/6.1
D D
0 0

Problem Problem
Yes/No Yes/No

No No
No No
No No
No No
No No
Actual Depth from Spillway Invert
8.0 6.0 n/a 4.4
n/a n/a n/a n/a
n/a 2.0 n/a 4.0
3.5 5.8 n/a 3.8
_
D D D D
0 0 0 0

Problem Problem Problem Problem
Yes/No Yes/No Yes/No Yes/No

No No No No
No No No No
No No No No
_
No No 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 adequate capacity within the 3.5 feet to contain 25-year event.
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Name of Inspector: Jim Stover '
J. E*8Q .1 s
Colorado P. E. 19230 Date