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proctor density. The compaction method specification of traversing the material at least twice <br /> with a haul truck or bulldozer will be utilized for the duration of the project; the method specification <br /> will be confirmed near the start of reclamation operations by testing compacted fill. Additional <br /> compaction testing will be performed throughout the reclamation process as new borrow sources <br /> are utilized. Each lift will be limited to less than three (3) feet in thickness to promote compaction. <br /> Granite from the upper highwalls will be bulldozed over the existing slope. These slopes achieve <br /> the required factor of safety and eliminate nearly all of the existing highwall. <br /> Monitoring <br /> Castle proposes to monitor the slope conditions starting after each lift is completed and continuing <br /> for at least one-year following the commencement of grading operations. The need for additional <br /> monitoring will be evaluated following the completion of the monitoring. Data will be collected from <br /> within the slide area and from adjacent areas where no movements have occurred. Slope <br /> monitoring will include visual inspections of the slopes and benches for signs of instability such <br /> as seeps, springs, erosion, cracking, slumping, or oversteepened slopes. Castle also proposes <br /> to continue monitoring the slope using the prism monitoring system during grading operations and <br /> for the one-year(or longer if necessary) monitoring period. <br /> Castle proposes these slope stability monitoring evaluation criteria: <br /> • Generally, there should be no signs of instability, such as seeps, springs, erosion, <br /> cracking, slumping, or oversteepened slopes. <br /> • Prism monitoring should show no continued movements, and movements should be <br /> within the data scatter of the instrument capabilities. <br /> Imported Fill <br /> Castle will continue to accept imported fill from offsite sources for use as backfill. This material is <br /> excess cut from construction projects throughout the greater Colorado Springs area, and the rate <br /> material is imported to the quarry will depend on future construction projects. The material will be <br /> stockpiled on the quarry floor so that Castle can control the placement and compaction of the <br /> backfill materials. Only clean fill will be accepted, and loads containing trash and other deleterious <br /> materials have been and will continue to be rejected prior to dumping. Similarly, coarse-grained <br /> material (>50% retained on No. 200 sieve) is preferred over fine-grained material (>50% passes <br /> No. 200 sieve), and fine-grained material will either be rejected or mixed with other granular <br /> materials available onsite. Castle expects there to be sufficient material imported to the quarry to <br /> complete the backfilling within five years; however, additional grading of the "Lower Borrow Area" <br /> Pikeview Quarry Amendment 4 <br /> 2019 <br /> D-4 <br />