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Mr. Gilbert F. Rindahl - 2 - June 17, 1985 <br /> Exhibit C - Pre-mining Plan Map <br /> 1. Several structures are within 200 feet of proposed mining operations. <br /> Please provide documentation that the respective owners do not appose the <br /> mining activities proposed to occur within 200 feet of the following <br /> structures: <br /> a. Gas well <br /> b. Gas lines <br /> c. Telephone line <br /> d. Ditch <br /> e. County road <br /> Be sure to show that the owners of the telephone line and gas lines are aware <br /> that mine-related excavation and earth moving will occur directly above and <br /> below said structures. <br /> 2. Please verify that the minimum 100' <br /> setback from St. Vrain Creek will remain completely undisturbed. <br /> 3. It is the Division's understanding that the minimum 50' setback from pit <br /> areas to the permit boundary is measured from the top of 3H: 1V pit slopes. <br /> 4. Please describe the wet areas designated to the south of St. Vrain Creek. <br /> Are these slough areas, partially flowing channels, or marsh? <br /> 5. Please amend this map to show the total permit area. (Current permit <br /> boundary and proposed amendment boundary. ) <br /> Exhibit C - Mining Plan Map <br /> 1 . There will be an excess of topsoil removed during mining operations. The <br /> staff will be recommending that enough topsoil be retained to allow 12 inch <br /> replacement rather than 8-10 inches. <br /> 2. It seems that topsoil would not be economically stored at the northwest <br /> location during the mining of Phases III, IV and V. Please comment as to <br /> whether additional storage sites will be utilized. <br /> 3. The application (page D-1) states that the northwest topsoil area will <br /> exchange acreage with the potential plant site (SE). This would seem to imply <br /> that the topsoil storage area will be cleared and reclaimed prior to plant <br /> site development. If this is the case, there would be no remaining topsoil <br /> storage area for additional mining. Please clarify. <br /> 4. Please describe the drainage system for dewatering. It seems that the <br /> north (Phase I) pump will actually drain upslope. Are there trenches planned <br /> which do not show on the maps. Please also specify the direction/route for <br /> dewatering drainage at the south area. <br />