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February 12, 2009 iM1 <br />FEB 1,3, <br />Mr. Jared Ebert Division of, ii,ecl „67arion, <br />Division of Reclamation, Mining and Safety Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Response to t-view for Riverbend Operation, <br />VDRMS File #M-2000-16, Technica Revision nt <br />Dear Mr. Ebert: <br />We received your Adequacy Review comment letter regarding Riverbend Operation, DRMS <br />File #M-2000-1.6 Technical. Revision 01 dated January 9, 2009 and have addressed your <br />comments. Below is ourxesponse to both of your comments. <br />1. Attached are revised versions of Exhibits C and F for the Riverbend Operation containing. the <br />information required by the DRMS Rules and Regulations. Both exhibits show the mining <br />and reclamation of Phase 9, Cell 1 which was not shown on the AMUSR=1259 maps we <br />submitted to you on December 22, 2008. <br />2. On Exhibit F the Reclamation Plans, we added a note to indicate that the Phase 8, Cell 1 and <br />Phase 9, Cell I augmentation ponds both need to be constructed with 3:1 slopes from the top <br />of the,pit to the bottom: The note can be found on sheet 3 of 3 with a leader from the note to <br />each pond. <br />We believe that these changes adequately address both of your adequacy review comments. In <br />addition, as part. of the process of updating Exhibits C and F, Tetra Tech identified a some other <br />minor adjustments we had to make to the mining cells and reclamation areas in order to leave <br />space for future.oil.and gas well operation facilities and make sure the mining cells are setback at <br />least 200' from the top of bank of the South Platte River. Therefore, Pam Hora updated the <br />attached table titled "Riverbend Operation Currently Permitted and Revised Mining and <br />Reclamation Areas and Uses" to reflect the information shown on the updated Exhibits C and F. <br />If you have any questions regarding the map changes or information contained in the attached <br />table, you can contact-me at 303.684-2307 or Pam Hora with Tetra Tech at 303-772=5282. <br />LAFARGE NORTH AMERICA INC. <br />11409 Business Park Circle, Ste 200 <br />Longmont, Co 80504 <br />(303) 657-4000 <br />www.lafargenorthamerica.com