HYDRO27879

• Permit No: C1981012
• IBM Index Class Name: Hydrology
• Doc Date: 2/9/2005
• Doc Name: 2004 Annual Sedimentation Pond Inspections
• From: Peak Project Management
• To: DMG
• Permit Index Doc Type: Prof Pond Certifications
• Media Type: D
• Archive: No

ANNUAL SEDIMENTATION POND INSPECTION REPORT
CDMR Rule 4.05.9(15)
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Mine: New Elk
NPDES ID. No.: None: Containment Area RDA-SE
Inspection Period: Fourth Quarter 2004
Inspection Date: 11/26/04
General Description or Reference to Site Plan:
This containment area lies East of the RDA refuse conveyor and south of Hwy. 12. It is designed
to contain run-off from this area of the RDA belt conveyor. Specifications are detailed on the
Containment Area RDA-SE As built drawing dated Zf26/93. The stage storage curve shows
top of embankment at 7413' with sediment accumulation to 7412.1'.
EMBANKMENT
1). Adequacy of the vegetative cover:
2). Erosion forming Gullies:
3). Is wave action causing erosion:
On the Upstream embankment?
Excellent Moderate Few Poor
Extensive >~ Few None
Yes
4). Erosion of the downstream toe of the embankment? Yes
Cause of erosion can be attributed to:
No
No r~
5). Is seepage occurring through the dam? Yes
Could thist°5eepage cause potential instability?
No /j-
SEDIMENT STORAGE CAPACITY
1). Has the design storage capacity of the reservoir been surpassed?
Yes
Page 1
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Elevation @ top of: ~,n (~Qn wn curt 7Y/ 3 (.Srv Crc•N«`
Elevation of Water Surface: ,cc
Elevation to top of Sediment: - , 6S = 7 ~ • 3
OTHER OBSERVATIONS