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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />COLORADO <br />Denver, Colorado 80203 IV IS I o N <br />D <br />Phone: (303) 866-3567 RECLAMATION <br />FAX: (303) 832-8106 MINING <br /> <br />November 05, 2010 SAFETY <br /> <br />Brian A. Watterson Bill Ritter, Jr. <br />Governor <br />Twentymile Coal Company Mike King <br />29515 Routt County Road #27 Executive Director <br />Oak Creek, CO 80467 Loretta E. Pineda <br /> Director <br />RE: Twentymile Coal Company, Permit C-1982-056 <br />Third Quarter 2010 Discharge Monitoring Report Review (Permit CO-0027154, CO- <br />0036684, COG-850051, CO-0042161, COG-850054) <br />September 2010 Discharge Monitoring Report Review (Permit COG-073311) <br />Dear Mr. Watterson, <br />The Colorado Division of Reclamation, Mining, and Safety (CDRMS) has reviewed and found the <br />above referenced reports to be in compliance with Rule 4.05.13(2). The 2nd quarter 2010 Discharge <br />Monitoring Reports for the above referenced CDPS Permits were received by the Division on 01 <br />August 2010; the reports cover the time period from 01 April 2010 through 30 June 2010. <br />Permit CO-0027154 - Only outfalls 005A/MON5/005W (Pond D), 003A (Pond B), 008A and (Pond <br />G) discharged during the third quarter 2010. No exceedances were noted. Outfalls 002A (Pond T), <br />004A (Pond C), and007A/007W/MON7 (Pond F) did not discharge during the month noted. Whole <br />Effluent Toxicity tests were collected for analysis for Outfall 005W during the quarter. The tests <br />indicated that the effluent was not acutely toxic to Daphina magna. <br />Permit CO-0036684 - Outfall 001A/001 W/MON1 (Site 62) discharged throughout the quarter with no <br />exceedances noted. Whole Effluent Toxicity tests were collected for analysis during the quarter. The <br />tests indicated that the effluent was not acutely toxic to Ceriodaphnia dubia or Pimephales promelas. <br />Permit COG-850051 - Outfall 001/OOW (6MN Pond) did not discharge during the quarter. <br />Permit CO-0042161 - Outfall 002A (sites 300E and 3001) discharged during the quarter. No <br />exceedances were noted. Outfalls 001A/001W/MON1 (site 115) did not discharge during the quarter. <br />Permit COG-073311 - Outfall 001A (Fish Creek Construction Crossing) discharged during the month <br />of September 2010. No exceedances were noted. <br />It is noted that this permit has received approval for termination at the end of October 2010. <br />Permit COG-850054 - Outfall 001A (18LT Pond) did not discharge during the quarter. <br />Office of Office of <br />Minpd I nnrd Rarlamatinn Denver • Grand lunction • Duraneo Active and Inactive Mines