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<br />Mining Phase <br />Year or Activity Description of Minims and Other Disturbance Activities <br />Phase 4 Only <br />5-6 Slurry Wall If PSCo. doesn't grant permission to cross their right-of--way, then <br />approximately 1 year prior to beginning mining in Mining Phase 4, the slurry <br />wall will be installed around the area north of the PSCo. right-of--way. The <br />proposed slurry wall setbacks are 10' from any property line, except along the <br />S. Platte River side. In this area, starting at from the PSCo. right-of--way, the <br />slurry wall will be located IO' west of the Sinclair gasoline pipeline. <br />Calculations on the lineal footage of slurry wall are included on Exhibit C-2, <br />Mining Plan Map. <br />Mining <br />7-10 Phase 4 Phase 4 mines 99± acres over a 4± year period and encompasses Parcel D-3. <br />This 99± acres does not include acreage within the low flow channel of the S. <br />Platte River east of the Adams County trail easement area, but does include <br />some area within 400' of the S. Platte River channel along portions of the <br />eastem boundary ofParcel D-3 as the mining limit follows the trail easement <br />and then the Sinclair pipeline. The mining does include construction of a ditch <br />along the boundary with the PSCo. right-of--way to convey irrigation tail and <br />drainage water to the S. Platte River to replace the ditch that presently crosses <br />Parcel D-3. As muting within 400' of the S. Platte River channel requires <br />approval by UD&FCD and agreement on what S. Platte River channel <br />improvements should be installed as a condition of approval, no mining will <br />occur without such approval and agreement. This 400' area and the proposed <br />mining setback area is shown on Exhibit C-2, Mining Plan Map. <br />Mining <br />7-10 Phase 4 Mining is proposed within 200' of the Sinclair Pipeline along the eastern <br />side of the phase. No mining shall be allowed within 200' of the Sinclair <br />Pipeline without an agreement by Sinclair or approval by the DMG of <br />a lesser setback based on a revised slope stability study. This 200' area <br />and the proposed mining setback are shown on Ezhibit C-2, Mining Plan <br />Map. In addition, as with Phase 3, mining is proposed within 200' of the <br />five PSCo. towers, and no mining shall be allowed within 200' of these <br />towers without an agreement PSCo., or in the event an acceptable license <br />agreement cannot be obtained, approval by the DMG of a lesser setback <br />with appropriate conditions based on a revised Slope Stability Analysis. <br />/tem #7- .Sorenson's comments <br />