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Colorado <br />Planning Department <br />1060 East 2nd Ave <br />Durango, CO 81301 <br />(970)382-6263 <br />July 24, 2015 <br />Robin Reilley <br />Mined Land Reclamation Board <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: King Coal Mine (C-1981-035) Technical Revision No. 25 (TR -25) <br />Dear Ms. Reilley: <br />Thank you for notification and the opportunity to provide comment on the King Coal Mine Technical Revision <br />No. 24. We reviewed the material submitted to the Division of Reclamation Mining and Safety (DRMS) related <br />to site drainage conveyance and detention in relation to a drainage study GCC submitted to the County on <br />September 5, 2013. <br />While DRMS regulations requires detention of the 25 -year storm for release at the historic 25 -year flow, La <br />Plata County Code requires detention of the 100 -year storm for release at the historic 100 -year flow. The data <br />provided to our two agencies are consistent with one another and demonstrate that the pond is of sufficient <br />size to meet county requirements. <br />Thus, our only concern is that periodic sediment removal occurs as required. Specifically, we request that <br />GCC's Operation and Maintenance plan specify, if it doesn't already: <br />1. That sediment be removed at 60% of maximum sediment level (based on our understanding of <br />DRMS requirements) and <br />2. The method of disposal of the sediment (handling, location, and any other DRMS requirements). <br />Thank you again for the opportunity to comment. <br />Sincerely, <br />Victoria Schmitt, PE <br />La Plata County Planning Engineer <br />Cc: Joe Kerby, County Manager <br />Damian Peduto, Community Development Director <br />Daniel Murray, Senior Planner <br />Sheryl Rogers, County Attorney <br />