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• ATTACHMENT 9-7 <br />TOPSOIL HANDLING PLAN <br />The East Wadge Extension Area topsoil handling plan, based predominantly upon the detailed <br />soil survey contained in Attachment 9-6 and secondarily on historic reclamation at Seneca <br />II Mine, was developed to insure that the most suitable topsoil within the disturbance <br />area is salvaged. The handling plan evaluates the topsoil resources, describes salvage <br />depths, and specifies an average redistribution thickness. Existing topsoil handling <br />techniques, storage methods, and maintenance or testing procedures for Seneca II hline, <br />which will remain applicable to the East Wadge Extension Area are described within <br />Attachments 9-1 and 9-4 of this tab, in the Topsoil Removal and Storage section of Tab 12, <br />and in the Topsoil Maintenance and Replacement section of Tab 13. <br />Evaluation of Topsoil Resources <br />The best sources of topsoil material within the East Wadge Extension disturbance area are <br />the Skylick silt loam (66E), Wineveda silt loam (53E), Wineveda-Splitro silt loam complex <br />• (X8E), Routt silty clay loam (2VE), Routt-Routt variant silty clay loam complex (2VD), and <br />Buckskin silty clay loam (12E) mapping units. These units occupy about 80 percent of the <br />projected disturbance area and contain from 1.0 to 4.0 feet of salvageable topsoil <br />material. These soils have thick (greater than 10 inches), organic matter enriched <br />surface horizons which overlie sandstone bedrock, loamy subsoil, or clay subsoil. <br />Generally, those soils which have a very high percentage of clay or possess shallow to <br />moderately deep ground water levels have little suitable topsoil to be salvaged. Only 0.5 <br />feet of topsoil is salvageable from the Bi nco-Aaberg silty clay complex (25E) and Capo <br />variant silt loam (23B) mapping units. <br />Topsoil Salvage Depths <br />The suggested salvageable depths of topsoil material presented in this section are based <br />on laboratory data and extensive field observations, and represent only the most suitable <br />sources of topsoil material. No unsuitable sources of topsoil will be salvaged and used <br />during reclamation activities. Topsoil salvage depths, presented in Table 9-7-1 and <br />• Exhibit 9-1, were determined in one-half foot increments after considering soil loss <br />attributed to brush clearing, slope steepness, and unsuitable inclusions (coarse fragments <br />9-7-3 Revised 05/16/88 <br />