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When the topsoil is used in reclaiming a disturbed <br /> area, it will be distributed over the area in depths appropriate <br /> to the type of material being covered. <br /> Soil types, chemical characteristics, and salvage <br /> depths (generally from 6 to 12 inches) are covered in detail in <br /> Sections G. 3 & 4 . , Chapter III. <br /> 7 . Overburden <br /> The handling of "overburden" related to the Coal Basin <br /> underground mining operations will be limited to the rock materials <br /> that will be generated by the construction of the two-bore rock <br /> tunnel . No cover material above the underground workings will be <br /> disturbed . <br /> In constructing the 15, 000 foot long rock tunnel, <br /> approximately 920, 000 cubic yards of rock spoil materials will be <br /> removed and disposed of at a rock disposal site near the tunnel <br /> portals (See Appendix II-B-5, Rock Tunnel Plan) . The rock spoil <br /> disposal site has been inspected and approved by OSM and the <br /> CMLRB . <br /> Prior to commencing construction of the twin bore <br /> tunnel, Mid-Continent conducted an environmental survey to <br /> determine the best methods of disposing the rock spoil with the <br /> least adverse environmental impacts . This survey included <br /> studies of soils, hydrology, geology and vegetation conditions in <br /> the area . Methods of collection and the results of the baseline <br /> data collection efforts are covered in Appendix II-B-5 . <br /> The tunnel project will disturb approximately 32 acres <br /> of surface land . This includes the portal area (6 . 4 acres) , <br /> Jg <br />