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Colowyo, C1981-019, PR3 adequacy No. 2 8 April 22, 2011 <br />Rule 2.05 - Operations and Reclamation Plan : <br />Colowyo Coal Company has informed the Division that significant changes to the mine plan for <br />the Little Collom X pit are anticipated. The Division has reviewed the original (1/23/2009) <br />Operations and Reclamation plan submitted by Colowyo and has questions more general in nature. <br />The Division acknowledges that a revised mine plan will be submitted" by CCC during this PR3 <br />review. The Division may then have new adequacy review questions after reviewing the new mine <br />plan that have not been raised herein. <br />1. Please include elevation values on the pre-mining topography map, Map 18B. <br />The response was adequate. Elevations were added to contours on Map 18B and numerous <br />other maps. <br />2. Revised Mine plan Map 28B shows the proposed dimensions of the Little Collum°X pit. This <br />map does not show haul roads into or out of Little Collum X pit, nor are" any ramps depicted. <br />How will Colowyo access the pit? Please show haul roads and.raraps into Little Collum X pit. <br />Haul roads are shown for Collum. Lite Pit, but no ramps are shown. Please add placement of <br />Ramp locations Collom Lite Pit. <br />Rule 2.05.3(3)(c) Mine Faci ities-Roads and 4.03 Maul Roads and Access Roads <br />CCC's responses to adequacy Items 2.05.3(3)(c), 1, 2, 3, and 4 are currently being evaluated by the <br />Division. If additional questions remain regarding this section, the Division will send a third adequacy <br />letter under separate cover with regards to these items. <br />Rule 2.05.3(4) Ponds, Impoundments, and Diversions <br />The application includes a plan to use an in-pit sump in combination with a large sediment pond <br />located below all mining within Collom Gulch. Geotechnical analyses for the pond were included <br />with the application. In general, the Division finds the plan adequate. However, based on recent <br />information regarding changes to the mine plan in the northern portion of the proposed permit area <br />due to Federal coal lease issues, runoff and sediment modeling will need to be rerun for the <br />proposed worst case disturbance. Other issues that were identified during the review' are as <br />follows: <br />• Some of the secondary drainages appear to be improperly located with regard to the post-. <br />mining topography. <br />• Disturbed areas are shown downgradient of sediment control ditches. <br />• It is not clear, given the timing of mining and reclamation, how reclaimed areas in the Collom. <br />Lite pit will be routed around the temporary spoil pile that will block Collom Gulch. <br />