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Revised 11/15/81 <br /> nutrients present in the soil and to specifically determine the required <br /> fertilization rates. A typical suite of soil parameters as recommended <br /> by the Colorado State University Department of Range Science or similar <br /> organizaiton will be utilized to determine the suitability of the <br /> topsoil material . Following determination of topsoil suitability, the <br /> appropriate fertilization rates will be utilized to enhance the <br /> revegetation potential of the disturbed area. <br /> Particular care will be utilized in the construction of the coal <br /> processing waste banks to ensure that this material does not constitute <br /> a fire hazard nor will cause acid-forming or toxic-forming material . <br /> Significant studies completed by CF&I Steel Corporation indicate that <br /> the coal processing waste material does not constitute a fire hazard nor <br /> is it acid-forming or toxic-forming. Exhibit 7, Overburden and <br /> Underburden Analyses, shows the chemical constituents of this material . <br /> CF&I Steel Corporation plans to utilize available soil material to cover <br /> the coal processing waste banks to ensure that revegetation of these <br /> areas is enchanced and to minimize the possibility for this material to <br /> cause damage to the environmental resources. Should any debris or <br /> acid-forming and toxic-forming material be located, this material will <br /> be buried under at least 4 feet of non-toxic or acid-forming material . <br /> Sealing and Managing Mine Openings <br /> Sealing of the openings which access the underground coal mining <br /> operations at the Maxwell Mine will be completed upon the final closure <br /> of the operation. Sealing will consist of installation of bulkheads <br /> near the surface of the openings to prevent entry to the mine or <br /> collapse of the surface. Bulkheads will consist of a minimum of 8 <br /> inches of reinforced concrete installed below the ground surface. A <br /> typical mine opening seal is shown on Figure 7. Particular care will be <br /> taken to ensure that excessive pressures do not accumulate on the inside <br /> of the seal and cause seepage or erosion around the seal . In addition, <br /> the seal will be sufficiently strong to support the surface material <br /> placed over the opening. The existing portal entrance excavation will <br /> be left intact to provide access to the sealed mine in the future. <br /> 2.05-34 <br />