2011-10-21_HYDROLOGY - C1981019 (2)

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Colowyo Coal Company O 573 State Highway 13 Meeker, CO 81641 T: 970-824-1573 I am a Licensed Professional Engineer in the State of Colorado and a representative of Environmental Solutions, Inc., P. O. Box 2996, Cheyenne Wyoming. 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. Note: (d) impoundment volumes are estimated from pre- existing as -built surveys, and estimates o't accumulated sediment. CF 21.1.2 2011 Outfall Inspection - Ponds 3rd Quarter 2011 Year 0 01111 II/40 O�•� C. ;II FI�� St� i :'' 3227 /OtJA E C� ��,� THOMAS C ERSON P.E. No. 32257 001A 002A 003A 004A 005A 006A 007A 008A 009A 01OA, 011A 012A Other Other Other Other Other Other Streeter _.. r. Sediment Pond . ;.--, .: Work Area Pond .. Gossard- Loadout Pond Gulch A � Pond Siding Stoker Sidrng, „ , Pond . - , • -Loop-- Rer[ -Prospect Pond r Pond , °West Pit Pond , Section .16A- Pond ._' Taylor East Pond West Taylor :. Y Pond _. �s <.., Sec�°28 Pond ..- Wash Pond Ta Ior�Pum ' Y P Hoidin Pond Aeration Ae Pond Westflvertlow Pond . East Overflow Pond Washha - y Sediment Sump Inspection Date: 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 9/9/2011 Inspector: Chip Brown Chip Brown Chip Brown Chip Brown Chip Brown Chip Brown Chip Brown Chip Brown Chip Brown Chip Brown Chip Brown Chip Brown Chip Brown Chip !frown Chip Brown Chip Brown Chip Brown Chip Brown Rule 4.05.9 (15) No No No No No No No No No No No No No No No No No No (a) Does pond exhibit structural weakness, erosion, or other hazardous conditions? (bl Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections I Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Quarterly/ Annual Inspections Monitoring Procedures and Instrumentation (c) 6583.0 ft. 7150.2 ft 6385.8 ft. 6609.3 ft. 6324.8 ft. 6348.2 ft. 6743.8 ft. 6823.1 ft. 7745.2 ft. 6944.0 ft. 7468.0 ft. DRY 7202.5 ft. I 6546.3 ft. 7203.0 ft. DRY DRY 7238.5 ft. Elevation & As -built Depth Water Level ( 1.43 ac - ft. 7.16 ac - ft. 1.35 ac - ft. 4.83 ac - ft. 0.40 ac - ft. 1.02 ac - ft. 2.37 ac - ft. 3.21 ac - ft. 0.75 ac - ft. 2.74 ac - ft. 1.39 ac - ft 1.05 ac - ft 6.18 ac - ft. 4.56 1 ac - ft. 0.79 ac - ft. 1.40 ac - ft. 1.70ac - ft. 0.67 ac - ft. Existing Storage Capacity None None Cleaning Septepmber 2011 None None None None None None Cleaning Complete August 2011 None None None None None None None None Maintenance Items Colowyo Coal Company O 573 State Highway 13 Meeker, CO 81641 T: 970-824-1573 I am a Licensed Professional Engineer in the State of Colorado and a representative of Environmental Solutions, Inc., P. O. Box 2996, Cheyenne Wyoming. 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. Note: (d) impoundment volumes are estimated from pre- existing as -built surveys, and estimates o't accumulated sediment. CF 21.1.2 2011 Outfall Inspection - Ponds 3rd Quarter 2011 Year 0 01111 II/40 O�•� C. ;II FI�� St� i :'' 3227 /OtJA E C� ��,� THOMAS C ERSON P.E. No. 32257