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ATCOLORADO Division of Reclamation, Mining and Safety Department of Natural Resources 1313 Sherman St. Room 215 Denver, CO 80203 June 15, 2018 R. Chauncey Luttrell Grey Rock Aggregate Company, LLC PO Box 342 Montrose, CO 81401 Re: Grey Rock Aggregate Company, Moonscape Pit M-1997-027, Technical Revision No. 2 (TR -02) Adequacy Review Dear Mr. Luttrell: The Division of Reclamation, Mining and Safety (Division) approved your Technical Revision submission on May 17, 2018. The request has been deemed complete and the Division is now in the process of reviewing the above referenced Technical Revision in order to ensure that it adequately satisfies the requirements of the Colorado Land Reclamation Act (Act) and the associated Mineral Rules and Regulations for the Extraction of Construction Materials (Rules). During review of the material submitted, the Division determined that the following issue(s) of concern need to be adequately addressed before the Technical Revision can be considered for approval. Please provide the following: 1. A letter from Delta County granting permission to use glass in Road Base on any road in Delta County. 2. Will the road base be for Chip Seal, Asphalt orjust gravel Road Base? Please clarify the application in detail of the material. 3. Will the breakdown of glass fragments create unnecessary dust that could be detrimental to human health and safety? Please submit your response(s) to the above listed issue(s) by Thursday, lune 21, 2018 in order to allow the Division sufficient time for review. If you cannot address the above issues by June 21, 2018 please request an extension to the decision due date to ensure adequate time for the Division to review materials. A decision due date of June 22, 2018 has been set. 1313 Sherman St. Room 215 Denver, CO 80203 P (303) 866-3567 F John W. Hickenlooper, Governor I Robert W. Randall, Executive Director I Virginia Brannon, Director