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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 />September 11, 2014 <br />Sean Frisch <br />Lafarge West, Inc. <br />8700 Bryn Mawr Ave, Ste 300 <br />Chicago, IL 60631 <br />RE: Bluestone Pit; DRMS File No. M- 1991 -035; Receipt of Technical Revision No. 4 <br />Dear Mr. Frisch, <br />The Division of Reclamation, Mining and Safety (Division) received Technical Revision - 4 for <br />the above referenced site on August 12, 2014. The decision date for this Technical Revision is <br />September 12, 2014. The Division has reviewed the Technical Revision Application and has the <br />following comments: <br />1. A review of the permit file found that several of the requested changes were already <br />approved through Technical Revision No. 3 (TR -03). Please confirm that these requested <br />changes were addressed through TR -03 and withdraw them from further consideration under <br />this submittal: <br />a. Breach existing silt ponds to create a single flow through system that drains water <br />from the site. <br />b. Minor changes to the grading plan to better match the existing contours and allow for <br />better flow through the site. <br />c. Change seed mixtures to be used during final reclamation. <br />2. Please indicate if the Operator holds a storm water discharge permit from the Water Quality <br />Control Division and if so, provide a copy of the permit. <br />3. Please indicate if the proposed channel on the south side of the groundwater pond has been <br />designed to accommodate a particular size storm, i.e. I Oyear /24hour. <br />4. The design for the proposed overflow channel does not include armoring. The Division is <br />concerned about possible erosion within the channel during a flood event. Please provide a <br />justification for not armoring. Alternately, the Applicant may revise the plan to include <br />armoring within the channel. <br />of C0 <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 1876 <br />