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Colowyo Coal Company <br />O• 5731 State Highway 13 <br /> Meeker, CO 81641 <br /> T:970-824-1573 <br />1o+• <br /> February 10, 2011 <br />Mr. James R. Stark <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RECEIVED <br />FEB 09 2011 <br />Lw u;i u; ,.eciamawn, <br />Mining and Safely <br />RE: Minor Revision - 106, Rill and Gully Plan, Colowyo Coal Mine, Permit No. C-1981- <br />019. <br />Dear Mr. Stark, <br />Enclosed please find two copies of materials provided in response to your adequacy <br />review for Minor Revision - 106. Colowyo has included the original comments generated <br />from your Preliminary Adequacy Review Letter dated February 3, 2011. <br />Your comments and Colowyo's response are as follows: <br />1. Colowyo has not provided any detail on the timing of the repairs following the <br />rill and gully survey. Colowyo states that a survey will be performed in the <br />spring and a final report will be submitted to the Division no later than 15 June <br />of the survey year but there is not mention of when Colowyo will fix any rills <br />and gullies. Colowyo states that they will provide an "...anticipated time <br />frame of repair..." but a more detailed description is required. All rills and <br />gullies must be fixed within the same calendar year that the rill and gully <br />survey was conducted. Please provide an additional description of the <br />proposed timing of the rill and gully repair on page 4.14-4. <br />Response: Colowyo has provided revised text on page 4.14-4 addressing timing <br />of any rill and gully repair. Colowyo is committed to repairing rills <br />and gullies in a timely manner and will have all rills and gullies <br />repaired within three months of being identified during the spring <br />inspection. Should grounds conditions not be favorable to access an <br />area within the three month time frame, Colowyo will access the <br />area for repairs as soon as conditions allow. <br />2. In question 22(b) of the Divisions 10 May 2010 Midterm Review of the <br />Colowyo Mine the Division requested that Colowyo submit a map of the rill <br />and gully areas in the annual rill and gully survey. In the text on revised page <br />Colowyo Coal Company • 5731 State Highway 13 • Meeker, CO 81641 <br />T+ 1 970 824 1529 • F+ 1 970 824 1598 • http://prospect.riotinto.org/irj/portal