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• TAB 21 MINESOIL RECONSTRUCTION Introduction This chapter outlines Peabody Coal Company's (Peabody~.s) plan for reconstructing mined-land soils and spoil at the Seneca II-N Mine. The plan addresses those, reclamation activities that are conducted during and immediately after backfilling and grading (Tab 20), but prior to revegetation (Tab 22). The objectives of the plan are to reconstruct plant growth and aquifer mediums that are capable of supporting the postminin9 Land uses. u The plan objectives are achieved by insuring that a sufficient thickness of suitable spoil is replaced in the pit bottom and a minimum of four feet of suitable plant grouch material, including topsoil, exists on the surface of graded lands prior to the commencement of revegetation activities. The plan presents an account of the plant growth material and aquifer medium requirements based upon current and projected disturbance areas and plant growth material and aquifer medium availability based on topsoil depth • mapping and overburden assessments. The plan also describes the ,procedural aspects of i removal, storage, redistribution, and testing of topsoil materials. n Overburden/SOOiI Nandlina Plan The following overburden/spoil handling plan was developed to ensure that a minimum of three feet of suitable plant growth material exists on graded .lands prior to the commencement of topsoiling activities. The plan is based upon the overburden assessment information previously discussed in Tab b. Overburden and Underburden Characteristics. Overburden and underburden characteristics are presented in Tab 6, Geology and Overburden Assessment. Overburden suitability is very similar to [he .wadge mining area for Peabody's Seneca .II Mine. The only significant difference between mine areas is more shaley Lennox overburden exists within the disturbance area at Seneca II-w. Approximately 78 percent of the overburden material is classified as suitable for root growth and aquifer medium material (Tab b, Appendix 6-5 and Table 6-3). All overburden and underburden strata had suitable values for salinity, • sodium adsorption ratio, molybdenum, selenium, arsenic, cadmium, mercury, and lead.