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<br />September 19, 2001 <br />Page 3 of 3 Pages <br />The Rail Loop Pond (Outfa11006A) <br />As reported, this pond was not in a good state of repair. <br />The approved design is found in Exhibit 7, Tab 13, Appendix F, 04-17-1998 of the Division <br />permit. The bottom of the pond is at an elevation of 6344.15 feet. The approved design is for <br />0.02 acre feet of sediment storage at a top of sediment storage level of 6344.98 feet. By reference <br />2) above, Colowyo Coal Company, L.P. (Colowyo) reports that there was approximately 5 feet <br />of sediment in the pond on June 10, 2001. This level of sediment equates to an elevation of 6349, <br />or approximately four feet higher than the design maximum. Reference 2) goes on to report a <br />current capacity of the pond to contain 0.3214 acre-feet of water prior to dischazging. This is the <br />storage capacity between the level of the S foot of sediment and the lowest dewatering hole of <br />the primary spillway riser. The water storage design capacity is 0.94 acre feet. <br />There appeared to be a level of water, frozen or with snow cover, in this pond in an aerial <br />photograph (aerial inspection) taken on Januazy 9, 2001. There was an estimated discharge of <br />0.03 cubic feet per second discharge from this pond at the time of a Division inspection of <br />February 20, 2001. There was water in, but no discharge from, this pond at the time of a Mazch <br />21, 2001 Division inspection. There was a little water in this pond but no discharge at the time of <br />the September 12, 2001 inspection. This pond has been cleaned. A picture taken of this pond on <br />September 12, 2001 is enclosed. <br />Please let me know if you have any additional questions or if I can be of additional assistance. <br />Yours truly, <br />B~ on G. Walker <br />Environmental Protection Specialist <br />1 Enclosure as stated <br />CC: Stephen R. Hinkemeyer, Engineering Manager, Colowyo Coal Company, L.P., <br />5731 State Highway 13, Meeker, CO 81641 (w/o encl) <br />Kimberley A. Wolf, Environmental Engineer, Colowyo Coal Company, L.P., <br />5731 State Highway 13, Meeker, Colorado 81641 (w/o encl) <br />Daniel L. Hernandez, CDMG (w/o encl) <br />Files: C:\WPDOCS\Colowyo\CDMR Colowyo.doc <br />CDMR, Colowyo, 151 Quarter 2001 <br />