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AVCOLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />April 14, 2014 <br />Kimberly Dennis <br />CEMEX, Inc. <br />P.O. Box 529 <br />Lyons, CO 80540 <br />RE: Lyons Quarry; DRMS File No. M -1977 -208; Technical Revision 12 — Adequacy Review <br />Dear Ms. Dennis, <br />The Division of Reclamation, Mining and Safety (Division) received Technical Revision - 12 <br />(TR -12) for the above referenced site on March 11, 2014 and the Technical Revision was filed <br />for review on March 24, 2014. The decision date for this Technical Revision is April 23, 2014. <br />The Division has reviewed the proposed revisions and has the following comments: <br />1. The Operator has proposed increasing the height of the cement kiln dust (CKD) stockpile in <br />C -Pit to support continued operations in the future. Please provide an estimate of how much <br />longer the operations will continue if the CKD could be stockpiled to 20 feet above the <br />existing grade. <br />2. Please specify how much additional CKD could be stored if the stockpile was increased to 20 <br />feet above the existing grade; provide all estimates in cubic yards. <br />3. The current Reclamation Plan specifies how the CKD stockpile will be reclaimed if the CKD <br />does not extend above the existing grade. Please specify how the CKD stockpile, with a <br />proposed height of 20 feet, will be reclaimed. The Reclamation Plan should include a <br />discussion of how the stockpile will be capped, including replacement of topsoil as well <br />revegetation techniques. <br />4. Please confirm that the proposed CKD stockpile will be contained within the footprint of C- <br />Pit. In addition, provide a revised Reclamation Plan Map which depicts the final <br />configuration of the CKD stockpile and include a cross - section of the CKD disposal area. <br />5. Currently any stormwater runoff in the CKD disposal area will report into C -Pit. Please <br />describe how stormwater runoff will be managed when the CKD stockpile extends above the <br />existing grade. In addition, specify how the Operator intends on controlling fugitive dust. <br />6. The Operator was authorized to use C -Pit as a CKD disposal area after conducting extensive <br />hydro - geologic investigations. The Operator has not addressed how the proposed increase in <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. Hickentooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />cel <br />N O <br />1876 <br />