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COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />February 5, 2015 <br />To: Brock Bowles <br />From: Jason Musick <br />RE: New Horizon Mine, C- 1981 -008 <br />TR -65, Adequacy Review Memo <br />Per your request, I have reviewed the proposed surface water portion of the above referenced revision. <br />According to the revision WFC is proposing to utilize straw wattles as sediment control measures to <br />prevent contributions of sediment to streamflow or runoff outside the permit area. The Division has the <br />following adequacy comments: <br />Based on the proposed page 2.05.3(3) -1 -85 and approved pages 2.05.3(3) -1 -87 and 88, WFC is proposing to <br />utilize straw wattles to maintain compliance with Rules 4.05.2 and 4.05.5. In order for the Division to <br />determine if the use of straw wattles will be in compliance as appropriate sediment control measures, <br />additional information must be provided. The approved and proposed information presented on the <br />referenced pages does not state the size of the wattles to be used to control sediment and runoff from <br />the Morgan property. In addition, the specifications and properties regarding the straw wattles ability to <br />control soil loss based on a 10 year -24 hour storm event was not included. Please provide a <br />sedimentology demonstration that represents the amount of soil loss predicted from the disturbance <br />area. Please also provide testing specifications and properties to include; size, minimum sediment <br />yield value, and installed freeboard height for the straw wattles to be used to prevent soil loss based <br />on the model to include size of wattles. <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http: / /mining.state.co.us <br />John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />OF'c <br />\876. <br />