2015-09-25_REVISION - M2001038 - Laserfiche WebLink

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4.3 RLL PHASING The Site is divided into five separate areas (labeled Phases A through E) and will be filled with inert material in four distinct fill phases (see Mining and Reclamation Phase Plan map). The Phase A area, a 5.11 acres area, has been previously mined and has been partially reclaimed. It will provide access for all future phase areas. The Phase B area, a 6.93 acre area, will be the first fill phase area. Based on an estimated annual fill rate of 46,800 cubic yards/year and an estimated 167,706 cubic yards of available fill volume, the Phase B area will be completely filled in approximately 3.5 years. The area will be filled and graded consistent with reclamation plan contours. Both Phase A and Phase B areas will be seeded with native grasses concurrently while moving fill operations to Phase area C. The Phase C area, a 5.2 acre area, will be the second fill phase area. Based on an estimated annual fill rate of 46,800 cubic yards/year and an estimated 251,680 cubic yards of available fill volume, the Phase C area will be completely filled in approximately 5.5 years. The area will be filled and graded consistent with reclamation plan contours and seeded with native grasses prior to commencement of fill operations in the Phase D area. The Phase D area, a 13.84 acre area, will be the third fill phase area. Based on an estimated annual fill rate of 46,800 cubic yards/year and an estimated 558,213 cubic yards of available fill volume, the Phase D area will be completely filled in approximately 11.9 years. The area will be filled and graded consistent with reclamation plan contours and seeded with native grasses prior to commencement of fill operations in the Phase E area. The Phase E area, a 7.17 acre area, will be the fourth and final fill phase area. Based on an estimated annual fill rate of 46,800 cubic yards/year and an estimated 115,676 cubic yards of available fill volume, the Phase E area will be completely filled in approximately 2.5 years. Only the western portion of the depicted Phase E area (Mining and Reclamation Phase Plan map) will be excavated/ filled to maintain the required set- back from Kiowa Creek, located south and east of the area. The disturbed portion of the Phase E area will be filled and graded consistent with reclamation plan contours and seeded with native grasses. 4.4 FINAL GRADES As indicated in Section 2, Site final grades will be generally consistent with pre - development grades. A final cover thickness of approximately twelve inches (12") will be placed on top of any imported inert fill. Final cover will be derived from stockpiled Site surficial and overburden materials. The final grades shown in the DRMS mining reclamation permit #M2001-038 (Appendix 1) will generally be consistent surrounding property grades. Final grades will allow for Bennett Sand & Gravel Pit#2 Inert Fill Page 10 of 30 MOLEN & ASSOCIATES, LLC August 3, 2015