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• ATTACHMENT 9-8 <br />SOIL BASELINE STUDY AND TOPSOIL HANDLING PLAN <br />Soil Baseline Study <br />Detailed soil survey information for the North Wadge Deadhead revision area is presented <br />within two previous sections of this tab. The 1979 soil ha seline study completed by <br />Claude Fly and Associates includes the 18.7 acres of additional North Wadge Deadhead <br />disturbance area requested within the existing Seneca Nine permit area. This soils data <br />is described in Tab 9 and the soil map units are shown on Exhibit 9-1 (Sheet 1 of 2). The <br />1988 soil baseline study of the East Wadge Extension Area encompasses the 12.6 acres of <br />additional permit area requested by the North Wadge Deadhead revision. This soils <br />information is presented in Attachment 9-6 and the soil map units are shown on Exhibit <br />9-1 (Sheet 1 of 2). <br />Topsoil Handling Plan <br />• <br /> The North Wadge Deadhead Area topsoil handling plan, based predominantly upon the detailed <br /> soil surveys of Seneca Mine and the East Wadge Extension Area presented previously in this <br />tab and secondarily on historic reclamation at Seneca II Mine, was developed to insure <br />that the most suitable topsoil within the disturbance area is salvaged. The handling plan <br />evaluates the topsoil resources, describes salvage depths, and specifies an average <br />redistribution thickness. Existing topsoil handling techniques, storage methods, and <br />maintenance or testing procedures for Seneca II Mine, which will remain applicable to the <br />North Wadge Deadhead Area are described within Attachments 9-1 and 9-4 of this tab, in the <br />Topsoil Removal and Storage section of Tab 12, and in the Topsoil Maintenance and <br />Replacement section of Tab 13. <br />Evaluation of Topsoil Resources. The best sources of topsoil material within the North <br />Wadge Deadhead disturbance area are the Skylick silt loam (66E), Wi neveda silt loam (53E), <br />Wi neveda-Splitro silt loam complex (XBE), and Routt silty clay loam (2VE) mapping units. <br />These units occupy about 95 percent of the projected disturbance area and contain from 1,5 <br />to 4.0 feet of salvageable topsoil material. These soils have thick (greater than 10 <br />• inches), organic matter enriched surface horizons which overlie sandstone bedrock, loamy <br />subsoil, or clay subsoil. <br />9-8-3 Revised 04/06/89 <br />