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DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866 -3567 <br />FAX: (303) 832 -8106 <br />May 14, 2013 <br />STATE OF COLORADO <br />COLORADO <br />ID IV I S I O N O F <br />RECLAMATION <br />MINING <br />SAFETY <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Brian A. Watterson Executive Director <br />Twentymile Coal Company Loretta E. Pineda <br />29515 Routt County Road #27 Director <br />Oak Creek, CO 84067 <br />RE: Twentymile Coal Company, Permit C -82 -056 <br />First Quarter 2013 Discharge Monitoring Report Review (Permit CO- 0027154, CO- 0036684, CO- 0042161, <br />COG - 850054, COG - 850051) <br />March 2012 Discharge Monitoring Report (CO- 0027154) <br />Dear Mr. Watterson: <br />The Colorado Division of Reclamation, Mining, and Safety (CDRMS) has reviewed and found the above referenced reports <br />to be in compliance with Rule 4.05.13(2). The First Quarter Discharge Monitoring Reports for the above referenced CDPS <br />Permits were received by the Division on 06 May 2013; the reports cover the time period from 01 January 2013 through 31 <br />March 2013 and O1 March 2013 through 31 March 2013 (CO- 0027154). <br />Permit CO- 0027154 — During the month of March 2013 only Outfall 005A/MON5 /005W (Pond D). flowed. <br />No outfalls discharged during the months of January and Febuary of the quarter <br />No exceedances were noted for the quarter or during the month of March. <br />During the first quarter 2013 WET tests were collected for Outfalls 005. The tests indicated that the effluent was not acutely <br />toxic to Ceriodaphina dubia, which is the required species for outfall 007. The required WET test for 005 is for Daphia <br />magna <br />Permit CO- 0036684 — Outfall 001A/001W/MONI (Site 62) did not discharge during the quarter. <br />Permit CO- 0042161 — Outfall 002A (sites 300E and 300I) discharged during March, with no exceedances noted. Outfall <br />00 1 A/00 I W/MON I (site 115) did not discharge during the quarter. <br />Permit COG - 850051 — Outfall 001 /OOW (6MN Pond) did not discharge during the first quarter 2013. <br />Permit COG - 850054 — Outfall 00 IA (181-T Pond) did not discharge during the first quarter 2013. <br />If you have any questions feel free to contact me. (303) 866 -3567 ext 8134 <br />Sincerely, <br />Jason Musick <br />Environmental Protection Specialist <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines <br />