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_ Section 780.11(b) Continued. <br />• <br />The volume of the temporary overburden stockpile was estimated aY 7,100,000 cubic <br />yards. A plan view of the original pile is provided on Map 34a, Kerr Mine Area <br />Premining Topography. This volume was determined through aerial photogrametery <br />and related volumetrics and reflects all additions to or removal of material from the <br />stockpile. <br />Dependent on variations in material properties, conditions at the time of recovery and <br />placement, and material handling and placement methods, material swell may vary <br />significantly. Significant changes in material placement methods and material <br />breakdown as a result of multiple handling will have the greatest impact on swell <br />factors. A detailed discussion of material swell factors is presented on page 780-4aa. <br />As shown on Map 31, Kerr Mine Area Soil Removal and Storage, nine temporary <br />topsoil and subsoil stockpiles were constructed. These new topsoil and subsoil <br />stockpiles have been strategically located and designed to accommodate the design <br />volumes shown on Map 31a, Kerr Mine Area Soil Removal and Storage, with 3:1 slope <br />• or less. Stockpiles were maintained and seeded with a rapidly growing cereal grain <br />species so as to minimize erosion. No traffic will be permitted on the stockpiles. <br />Stockpiles are appropriately marked with conspicuous signs made of a durable <br />material. Generally, stockpiled topsoil will not be moved until required for <br />redistribution on a regraded area. Topsoil will be redistributed so as to achieve an <br />approximate uniform and stable thickness and to minimize compaction. On cessation <br />of all mining operations, all topsoil stockpiles will be removed and topsoil will be <br />redistributed prior to revegetation. <br />Coal Handling Storage and Transportation Areas and Structures <br />All coal removed from the mining area was hauled to the Kerr Tipple Area where it <br />was stockpiled until crushed and loaded <br /> <br />TR-19 780-10a Revised 11/98 <br /> <br />