2009-10-13_HYDROLOGY - C1981019

• Permit No: C1981019
• IBM Index Class Name: HYDROLOGY
• Doc Date: 10/13/2009
• Doc Name: 3rd Quarter 2008 Impoundments/Stock Ponds Inspection
• From: Colowyo Coal Company
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspect
• Email Name: JRS
• Media Type: D
• Archive: No

0 Colowyo Coal Company
5731 State Highway 13
Meeker, CO 81641
4
T:970-824-1500
DATE: 9/24/09
ANNUAL IMPOUNDMENT INSPECTION
SMALL IMPOUNDMENTS / STOCK PONDS
RIO TINTO
rn1 nwvn Cne1 rnnnDAK1V t D

mpoundment Name Erosion, Instability,
Structural Weakness,
Hazardous Conditions
4.05.9 (15)(a)
Monitoring procedures
and Instrumentation
4.05.9 (15)(b)
Depth of
Impounded Waters
4.05.9 (15)(C)
Elevation of
Impounded Waters
4.05.9 (15)(c)
Existing Storage
Capacity
4.05.9 (15)(d) Other Structural
Instability or Main
Required
4.05.9 (15)(e)
Experienced
Impoundment
Inspector 4.05.9 14
Date
Of
Inspection
Stock Pond A None Annual Inspections Dry 7259.5 ft. 0.041 ac-ft. None R. Pawlowski 9/24/2009
Stock Pond B None Annual Inspections Dry 7220.0 ft. 0.068 ac-ft. None R. Pawlowski 9/24/2009
Stock Pond C None Annual Inspections Dry 7206.5 ft. 0.060 ac-ft. None R. Pawlowski 9/24/2009
Stock Pond D None Annual Inspections Dry 7222.0 ft. 0.042 ac-ft. None R. Pawlowski 9/24/2009
Stock Pond E None Annual Inspections Dry 7302.5 ft. 0.036 ac-ft. None R. Pawlowski 9/24/2009
Stock Pond F None Annual Inspections Dry 7342.0 ft. 0.072 ac-ft. None R. Pawlowski 9/24/2009
Stock Pond G None Annual Inspections Dry 7789.5 ft. 0.283 ac-ft. None R. Pawlowski 9/24/2009
Stock Pond H None Annual Inspections Dry 7870.0 ft. 0.219 ac-ft. None R. Pawlowski 9/24/2009
Stock Pond I None Annual Inspections Dry 7821.5 ft. 0.036 ac-ft. None R. Pawlowski 9/24/2009
Stock Pond J None Annual Inspections Tem porarily covered by topsoil stockpile R. Pawlowski 9/24/2009
Stock Pond K None Annual Inspections Dry 7889.0 ft. 0.990 ac-ft. None R. Pawlowski 9/24/2009
Stock Pond L None Annual Inspections Dry 7288.5 ft. 0.113 ac-ft. None R. Pawlowski 9/24/2009
Stock Pond M None Annual Inspections Dry 7297.5 ft. 0.039 ac-ft. None R. Pawlowski 9/24/2009
I am a Professional Engineer in the State of Colorado and a representative of Environmental Solutions, Inc. The
information contained in this document was provided by Colowyo Coal L.P. Being familiar with the Colowyo operation and
the coal permitting process in Colorado, the information contained herein is reasonable and correct to the best of my
experience.
Certified By/: C
-7/1- 410?lp Thomas C. Peterson
Date:
Qd , C. Pfl %
%
cs ? err . d
32257 =
• 4r
?a `??26149 • ?
rrrv
CF 21.1.2 Note: (d) impoundment volumes are estimated from existing as-built surveys and estimates of accumulated sediment P.E. .E. NO.
.
CF 17.18 2009 Revised 924/2009