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4. Backfilling and grading will be ongoing as areas are mined out and room for backfilling <br />becomes available. No more than twenty five (25) surface acres will be disturbed at any <br />one time. <br />5. No refuse or acid- forming or toxic - producing materials are known. <br />6. No drill or auger holes are anticipated. <br />7. Spoil slopes shall not exceed 3H to 1V. <br />8. All areas will be graded to allow operations by farm machinery. <br />9. Only native on -site materials will be used. <br />10. No pollutants will be released. Oils and lubricants will be confined and contained. <br />11. No groundwater contamination will occur. <br />d) Reclamation Implementation <br />Topsoil Preservation, Storage & Replacement: <br />Topsoil ranges from 0 to 1 foot throughout the area. All topsoil will be stripped prior to mining <br />in any cell. Topsoil will be segregated in stockpiles or used to construct perimeter berms. <br />Concept locations are shown on Exhibit C2. As areas are reclaimed and graded to final condition <br />(as shown on Exhibit F), topsoil from the stockpiled areas will be placed on the graded reclaimed <br />area to the average depth present prior to the commencement of mining or 6 inches, whichever <br />is less. Care will be used to prevent excessive compaction of the topsoil zone. <br />Seeding: <br />Final seeding will occur in the topsoil zones. Seeding of properly graded and topsoil covered <br />reclamation areas shall occur between December 1' and May 1st. If the site must be seeded <br />outside of this date range, a long- season grain such as wheat or oats shall be planted to aid in <br />stabilization until the reclamation seed mix (shown below) can be sowed. The area will be <br />seeded as follows: <br />Reclamation Seed Mix: <br />Buffalo Grass (Texoka, Sharps Improved) 3.Olbs. /acre <br />Little Bluestem 2.5lbs. /acre <br />Sideoats Grama (Vaughn, Butte, Niner, El Reno, Haskell) 2.0 lbs. /acre <br />Blue Grama (Hachital, Lovington) 3.Olbs. /acre <br />Sand Dropseed 0.5lbs. /acre <br />Switchgrass 2.Olbs. /acre <br />3 <br />