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Overburden stockpiles will be placed within the 50 ft geotechnical setback to create <br />visual barriers to the mining operation from adjacent properties across the road, and from <br />the road itself. Backfilling of Phase 12 will occur concurrently with mining using the <br />overburden stockpiles adjacent to the phase. This will serve a dual purpose, the first <br />being backfilling back to approximately existing grades closest to the road first to ensure <br />availability of adequate backfill material quantities on a priority basis with adjacent to the <br />road being a higher priority than at the edge of the floodplain to the west. The second <br />purpose is to backfill the first phase as soon as possible thereby creating a low <br />permeability barrier that will minimize impacts of dewatering on domestic and irrigation <br />wells across Brighton Road to the east. Portions of Phases 13, 14 and 17 may have to be <br />similarly mined and backfilled to extend the currently planned Phase 12 ground water <br />barrier depending upon the results of ground water monitoring during mining of Phase <br />12. <br />Following completion of Phase 12, mining will generally proceed from south to <br />north toward the existing plant area. Phase 13 will mine the furthest south 11.2 acres of <br />the Arends property within the proposed expansion area. Phase 14 will include mining of <br />the east side of the relocated McCann Ditch in the north half of the Arends property and <br />will comprise approximately 6.9 acres. Phase 15 will include mining of the west side of <br />the relocated McCann ditch within the Arends property and will include the presently <br />unmined southeast corner of existing Phase 10. This new Phase 15 will comprise about <br />16.4 acres. Phase 16 will mine the remaining parts of the Reinoehl property in the <br />middle of the proposed new mining phases. Phase 16 will be east of the relocated ditch <br />and comprise approximately 16.8 acres. Phase 17 will comprise the Archuleta property <br />and there will be a 50 ft geotechnical stability setback along Third Creek along the east <br />and north sides of this phase, which will include 6.7 acres of mining. The final mining <br />will occur in Phase 18, north of the proposed new expansion area and this phase comprise <br />s the existing plant area (presently permitted disturbance, but not for mining). During <br />mining, only approximately 40 acres maximum will be undergoing disturbance by <br />stripping or active mining at any given time. All mining, except for Phase 11 will be dry. <br />Based on our current assessment of the property's reserves and overburden <br />thickness, volume calculations for the minable acreage as shown on Figure D1, and a <br />22