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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmem o(Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: 130J) 866-3567 <br />FAX: (303) 832-8106 <br />September 19, 2001 <br />Ms. Carla Lenkey <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80222-1530 <br />Re: Colowyo Coal Co <br />Reference: <br />DIVISION OF <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MINING•SAFETY <br />Bit I Owens <br />Governor <br />GregE Watcher <br />Executive Director <br />Michael B. Long <br />Division Director <br />1) Colorado Division of Minerals and Geology letter of September 18, 2001, same subject. <br />2) Colowyo Coal Company L.P. letter of June 14, 2001, Re: Colowyo Coal Company L.P. <br />(Colowyo); CDPS No. CO-0045161 First Quarter Follow Up Letter <br />3) Colowyo Coal Company L.P. letter of July 18, 2001, Re: Colowyo Coal Company L. P. <br />(Colowyo); CDPS No. CO-00045161 First Quarter Follow Up Letter for Outfalls OOIA and <br />OOSA <br />Dear Ms. Lenkey: <br />This letter is in response to our telephone conversation of this morning. Your clarification was <br />for an assessment of the state of repairs and conditions of the ponds at the time of exceedences <br />reported in the 1~` Quarter 2001 Dischazge Monitoring Reports. Such state of repairs or <br />conditions aze measured against the approved pond designs in the Colorado Division of Minerals <br />and Geology (Division) Permit Application Package for Permit C-81-019. <br />The sedimentation ponds at Colowyo Coal Company, L.P. Colowyo Coal Mine (Colowyo) are <br />now operated as treatment ponds (passive, automatic dewatering) in lieu of the former <br />containment mode. As such, if the pond contains water to the level of the drawdown weep holes, <br />any water (in any amount) entering the pond will simultaneously initiate a discharge. Initially, <br />runoff into the pond will displace [he clear water (if any) [hat was retained in the pond. After <br />displacement, [he pond is designed to hold new mnoff water long enough for any discharges to <br />meet settleable solids limitations. <br />The Streeter Pond (Outfa11001A) <br />The condition and state of repair of this pond was marginal. <br />~ir ~ / 8 <br />