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2.05.3(5) Topsoil <br />Topsoil as used in this application will be defined to be the "A" soil horizon. From the <br />soils information Section 2.04.9, it has been determined that topsoil is either scarce, non- <br />existent or difficult to salvage in a major portion of the area to be disturbed by mining. <br />Results of chemical analyses indicate that horizon 'B" and "C" offer suitable revegetation <br />potential, particularly in Falfa clay loam, 3 to 8 percent slopes. The basic soil salvage <br />plan is to retrieve all existing, suitable soil in areas where retrieval is practicable and <br />make up deficiencies from disturbed areas occurring on the Falfa clay loam soil. <br />The delineation of stripping areas and depths are shown on Map 5 -3 and Table 5 -2 <br />(Exhibit O of Appendix 2.05) indicating soil balance numerics. Existing stockpile <br />locations are shown on Map 5 -7; approximate dimensions are shown on Table 5 -3 <br />(Exhibit O). <br />The operational aspects of soil stripping and respreading occur in the following order. <br />Initially, trees and large shrubs are grubbed and removed from the area. Next suitable <br />soil materials are salvaged and either stockpiled or returned to an area ready for re- <br />topsoiling. After respreading, the replaced soil materials are seeded and mulched. <br />The soil stockpiles have been seeded with the following seed mix: <br />Species lbs. /acre <br />Slender Wheatgrass 10.0 <br />Western Wheatgrass 10.0 <br />Thickspike Wheatgrass 10.0 <br />Crested Wheatgrass 3.0 <br />Perennial Rye Grass 3.0 <br />Cicer Milkvetch 1.0 <br />Utah Sweetvetch 1.0 <br />Total Seed Rate 38.0 <br />2.05.3(6) Overburden <br />From the early mining activities the swell factor has been estimated at 30%. This swell is <br />based upon a calculation made from the existing pit and fill area. It should be noted that <br />there is a slight variance between the original topographic maps and those flown in 1990 <br />by Air Photo Surveys. <br />Prior to placement of material in the permanently reclaimed spoils area (box cut spoil), <br />and after the removal of soil materials, the applicant placed a sandstone underdrain in the <br />bottom of the spoil. The size of the underdrain was as designed with no less than 15 feet <br />• <br />Abridged Permit Document 5 -17 Feb 2008 <br />