2015-10-07_HYDROLOGY - C1981019

• Permit No: C1981019
• IBM Index Class Name: Hydrology
• Doc Date: 10/7/2015
• Doc Name: 3rd Quarter 2015 Impoundment Report
• From: Tri-State Generation and Transmission Association, Inc
• To: DRMS
• Permit Index Doc Type: Sediment Pond Inspections
• Email Name: ZTT
• Email Name: JRS
• Media Type: D
• Archive: No

Colowyo Coal Company
5731 State Highway 13
Meeker, CO 81641
Outfall Inspection - Ponds
Third Quarter 2015
Year
I am a Licensed Professional Engineer in the State of Colorado The information contained in this document was provided by Colowyo Coal L.P.
Being familiar with the Colowyo operation, and relying on the information provided to me by Colowyo Personnel, the information contained herein is
reasonable and correct to the best of my knowledge and experience.
* Moment in time measurement of the elevation of the top of the captured pool of water within the pond.
All ponds were surveyed during 2nd quarter, 2014 other than the West Taylor and East Taylor Ponds, which were surveyed after dredging during 3rd quarter, 2014.
The East Taylor Pond required additional dredging, which was completed during 4th quarter 2014. The East Taylor Pond was re -surveyed on 10-31-14
Note: (d) Existing storage capacities were adjusted to reflect sediment import since 2014 survey.
CF 21 1 2 2014
34
26
1r7i7A'A
iFTIMM
Inspection Date:
9/21/2015
9/21/2015
9/21/2015
9/21/2015
9/21/2015
9/21/2015
9/21/2015
9/21/2015
9/21/2015
9/21/2015
9121/2015
9/21/2015
Inspector
K. Blunt/
K Blunt/
K Blunt/
K. Blunt/
K. Blunt/
K. Blunt/
K. Blunt/
K Blunt/
K Blunt/
K. Blunt/
K. Blunt/
K. Blunt/
S. Weist
S. Weist
S. Weist
S. Weist
S. Weist
S. Weist
S Weist
S. Weist
S. Weist
S. Weist
S Weist
S Weist
Rule 4.05.9 (15)
()
Does pond exhibit
No
No
No
No
No
No
No
No
No
No
No
No
structural weakness,
erosion, or other
hazardous conditions?
( b )
Quarterly/
Quarterly/
Quarterly/
Quarterly/
Quarterly/
Quarterly/
Quarterly/
Quarterly/
Quarterly/
Quarterly/
Quarterly/
Quarterly/
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
andMonitoringProcedures
and Instrumentation
Inspections
Inspections
Inspections
Inspections
Inspections
Inspections
Inspections
Inspections
Inspections
Inspections
Inspections
Inspections
C)
*Water Elevation
6583.00
7151 00
6391 00
Dry
6325.00
6348.50
6741.50
Dry
7745.00
6944.00
7468.00
Dry
J1
Existing Storage
1.62
9.84
1.29
3.70
0.35
0.46
1.94
3.87
0.58
2.39
1 65
1.67
Capacity (ac -ft)
(_eJ
Design storage below
2.63
12.33
3.00
3.82
0.38
1.00
2.25
5.50
1.26
2.85
1.77
1.67
weep holes/primary
discharge (ac -ft )
( f )
Maintenance Items
None
None
None
None
None
None
None
None
None
None
None
None
I am a Licensed Professional Engineer in the State of Colorado The information contained in this document was provided by Colowyo Coal L.P.
Being familiar with the Colowyo operation, and relying on the information provided to me by Colowyo Personnel, the information contained herein is
reasonable and correct to the best of my knowledge and experience.
* Moment in time measurement of the elevation of the top of the captured pool of water within the pond.
All ponds were surveyed during 2nd quarter, 2014 other than the West Taylor and East Taylor Ponds, which were surveyed after dredging during 3rd quarter, 2014.
The East Taylor Pond required additional dredging, which was completed during 4th quarter 2014. The East Taylor Pond was re -surveyed on 10-31-14
Note: (d) Existing storage capacities were adjusted to reflect sediment import since 2014 survey.
CF 21 1 2 2014