2020-03-02_REVISION - M1977211 - Laserfiche WebLink

Home Browse Search

CMC CONTINENTAL MATERIALS CORPORATION Table D-1 Monitoring Frequency Monitoring Type Frequency Visual inspection Daily/Monthly Robotic theodolite/prism Continuous Drone inspection Monthly CMC proposes these slope stability monitoring evaluation criteria: • Generally, there should be no signs of instability, such as seeps, springs, erosion, cracking, slumping, or oversteepened slopes. • Prism monitoring should show no continued movements, and movements should be within the data scatter of the instrument capabilities. Imported Fill CMC will continue to accept imported fill from offsite sources for use as backfill. This material is excess cut from construction projects throughout the greater Colorado Springs area, and the rate material is imported to the quarry will depend on future construction projects.As discussed above, all the material necessary to reclaim the quarry is available onsite, and as fill material is imported, the volume of material needed to be excavated onsite will be reduced. Imported material will be stockpiled on the quarry floor so that CMC can control the placement and compaction of the backfill materials. Only clean fill will be accepted, and loads containing trash and other deleterious materials have been and will continue to be rejected prior to dumping. CMC will visually inspect each truck-load for confirmation that the material is fill that is free of deleterious materials. Similarly, coarse-grained material (>50% retained on No. 200 sieve) is preferred over fine-grained material (>50% passes No. 200 sieve), and fine-grained material will either be rejected or mixed with other granular materials available onsite. CMC expects there to be sufficient material imported to the quarry to complete the backfilling within five years; however, additional grading of the "Lower Borrow Area" may be required to supplement the imported fill. CMC will submit a Technical Revision if additional grading is required. CMC is currently negotiating with the City of Colorado Springs and private companies to develop the property adjacent to the mine. Regardless of the development type, all or nearly all of the imported material necessary for reclaiming the mine can be provided by this development with the costs to deliver the material to the existing quarry stockpile area burdened by the developer. Temporary haul roads on the face of the fill slope will be used to transport material from the loading areas to the fill areas. The exact location of access and haul roads are not shown on the Pikeview Quarry Amendment 4 D-5