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• COLORADO fev) 1-a k <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />4cember 3, 2014 <br />Tom Smith <br />/Rocky Mountain Materials & Asphalt, Inc. <br />1910 Rand Ave <br />Colorado Springs, CO 80906 <br />RE: outh Asphalt Plant; DRMS File No. M- 2009 -004; <br />(/Preliminary Adequacy Review - Technical Revision No. 1 (TR -01) <br />Dear Mr. Smith, <br />The Division of Reclamation, Mining and Safety (Division) received Technical Revision No. 1 <br />for the above referenced site on December 2, 2014. The decision date for this Technical <br />Revision is January 1, 2015. The Division has reviewed the Technical Revision Application and <br />has the following comments: <br />1. Please characterize the expected or typical material to be imported. Characterization should <br />address: <br />a. potential sources, <br />b. gradation generalization, <br />c. largest size (e.g., Dtoo), <br />d. organic content, <br />e. other parameters that may affect compaction and/or settling. <br />2. Please indicate if the final contours which are depicted on the approved Reclamation Plan <br />Map will change. If so, provide a revised Reclamation Plan Map which shows the proposed <br />topography of the area with contour lines of sufficient detail to portray the direction and rate <br />of slope of all reclaimed lands. <br />The Division is concerned with the potential for sinkholes developing over the long term due <br />to piping where voids occur and /or compaction is insufficient. The formation of sinkholes is <br />not considered compatible with the approved industrial post- mining land use (reference Rule <br />3.1.5(9)(e). Per Construction Materials Rule 3.1.5(9)(f), please provide additional detail on <br />how the imported material will be placed such that voids in the backfilled area do not occur. <br />In addition, describe how complete compaction of the backfilled material will be achieved. <br />or corn, <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />W. Hickentooper, Governor I Mike King, Executive Director ( Virginia Brannon, Director '876 „' <br />