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Colowyo Coal Company <br />?• 5731 State Highway 13 <br />O Meeker, CO 81641 <br />O-q T:970-824-1500 <br />pod* <br />Z <br />C June 9, 2011 <br />Mrs. Janet Binns <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Minerals, and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />A TV <br />piv?ps&?o?? of <br />ST, <br />RE: 2010 Annual Hydrology and Reclamation Report, Colowyo Coal Company L.P, <br />Permit No.: C-81-019 <br />Dear Mrs. Binns: <br />Colowyo received the Division's review letter of the 2010 Annual Hydrology Report on <br />May 27, 2011. Colowyo has the following responses: <br />SECTION 1 <br />General Discussion <br />The text in the permit application indicates that sediment in sediment ponds will be <br />surveyed (page 4.05-14). In 2010, was this survey completed? If not, please explain why <br />this was not necessary. <br />Response: Colowyo completes estimated sediment surveys on all sediment ponds on a <br />quarterly basis. These surveys were submitted to Mr. Jim Stark on April 9, 2010, July 6, <br />2010, September 14, 2010, and January 7, 2011 respectively. <br />Data from DMRs was not provided in the AHR, but a review of this data was deemed to <br />be important when assessing CCC water quality. Therefore DRMS reviewed this data <br />and found that there was only one day all year when parameters exceeded effluent <br />limitations in the CDPHE permit: on May 4, 2010, there were elevated level of Iron in <br />discharge from Prospect Pond (CDPS point 007A) and elevated level of TSS in discharge <br />from West Taylor Pond (CDPS point 011A). Please explain if a report was filed with <br />CDPHE, or, if not, why it was not filed. <br />Response: A waiver request under the alternative limitations for the elevated Iron level <br />was submitted to CDPHE for the May 4, 2010 sample from Outiall 007A.