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Mr. AI Amundson Mr. Anthony J. Waldron Environmental Protection Specialist State of Colorado Deparhnent of Natural Resources Division of Minerals and Geology July 8, 2002 Page 3 9. GCC Rio Grande, Inc. has amended the affected azea boundary. Total azea remains the same as the original permit application. Revised Exhibit C-2. B. 6 4.4 EXHIBIT D -MINING PLAN 1. (page 4) -Attached new Exhibit D-1 is a schematic of the mine operation that illustrates mining and reclamation activities and the sedimentation control plan in Year 8. The maximum footprints of overburden and topsoil stockpiles aze shown on Exhibits D-1 and D-2. Attached new Exhibit D-2 illustrates the status of reclamation efforts at the end of the eighth yeaz of mining. Both figures illustrate the location of potential stockpiles. Note that the azeas illustrate the maximum possible stockpile footprint, and that not all of the azea may be used for stockpiles. Significant portions of the stockpile illustrated in the area outside of mining years 4 and 5 will be removed during reclamation of the Years 1 through 5 mining panel. The stockpile footprint for year 6pre-stripping will be located above the Year 15 mining block, which is not illustrated on Exhibits D-1 or D-2. 2. (page 4) -Attached new Exhibit D-3 illustrates detailed design elements for the surface water management plan. Exhibit D-3 shows the locations of in-pit sediment/detention ponds, cleaz-water diversions for the mine and plant site, arroyo protection measures, reconstructed arroyos, culverts for the access road and railroad spur, sediment and detention pond for the plant area, plant area storm sewer system, and other pertinent features. These facilities are further described in revised Exhibit D for the mining permit application and the detailed report provided in Appendix F of the Application titled "Surface Water Management Plan." These supplemental documents address how storm water will be passively discharged and flow unimpeded back into the St. Chazles River, and how the arroyo watersheds aze restored. 3. (Page 4) -GCC Rio Grande does not plan to use dorm water for dust control. Should GCC Rio Grande, however wish to do so, it would first obtain a suitable augmentation plan. However, given the present plan, references to such use have been removed from the application. 4. (Page 5) -The final reclamation contours were designed to not impound water; however, attached revised Exhibit F-1 is submitted based on an alternative final reclamation and drainage philosophy that restores all of the disturbed arroyos, as discussed on pages D-12 and D-13 and the detailed report provided in Appendix F of the Application titled "Surface Water Management Plan." {80600:1 }