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• TAB 21 <br />MINESOIL RECONSTRUCTION <br />Introduction <br />This chapter outlines SCC's plan for reconstructing mined-land soils and spoil at the Seneca II-W Mine. <br />The plan addresses those reclamation activities that are conducted during and immediately after <br />backfilling and grading (Tab 201, but prior to revegetation (Tab 221. The objectives of the plan are to <br />reconstruct plant growth and aquifer mediums that are capable of supporting the postmining land uses. <br />The plan objectives are achieved by insuring that a sufficient thickness of suitable spoil is replaced in <br />the pit bottom and a minimum of four feet of suitable plant growth material, including topsoil, exists on <br />the surface of graded lands prior to the commencement of revegetation activities. The plan presents an <br />account of the plant growth material and aquifer medium requirements based upon current and <br />projected disturbance areas and plant growth material and aquifer medium availability based on topsoil <br />depth mapping and overburden assessments. The plan also describes the procedural aspects of <br />removal, storage, redistribution, and testing of topsoil materials. <br />• Overburden/Spoil Handling Plan <br />The following overburden/spoil handling plan was developed to ensure that a minimum of three feet of <br />suitable plant growth material exists on graded lands prior to the commencement of topsoiling <br />activities. The plan is based upon the overburden assessment information discussed in Tab 6. <br />lab 6 includes overburden assessment information, including overburden and underburden <br />characteristics and acid and toxic-forming materials, representative of the Wadge and Sage CreeklWolf <br />Creek mining areas in the southern mining block. Lithologic logs of bore and core holes located in the <br />southern block used for overburden analysis have been added to Appendix 6-1. Laboratory results from <br />analyses of overburden samples (cores and drilling chips) collected in the southern mining block have <br />been inserted in Appendix 6-3. Appendix 6-5, which provides unsuitable quality zones by parameter in <br />overburden and underburden, has been updated to identify unsuitable zones in the southern block <br />Wadge and Sage Creek/Wolf Creek mining areas. Appendix 6-5 also identifies the measures that will <br />be used to mitigate unsuitable materials identified. <br />Overburden and Underburden Characteristics. Overburden and underburden characteristics are <br />presented in Tab 6, Geology and Overburden Assessment. Overburden suitability is very similar to the <br />• <br />TR-50 1 Revised 11!04 <br />