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approximately 21,300,000 tons of waste rock. Natural ground <br />• slopes at the site vary from 2H:1V to 20H:1V and average <br />approximately 12H:1V or eight percent. The vegetation is <br />characterized as sagebrush flats and is discussed in Exhibit <br />J of the approved permit. Soils are of the Blackhall gravelly <br />sandy loam and are discussed in Exhibit I of the approved <br />permit. <br />Waste Rock Disposal Area D lies south of 'the Rito Seco <br />between the haul road and the eastern permit boundary. Area <br />D covers approximately 42 acres and has been designed to store <br />approximately 3,200,000 tons of waste rock. Slopes at Area D <br />range from 2.5H:1V to 20H:1V and average approximately 8H:1V. <br />Vegetation and soils at Area D are the same as described for <br />the South Area above. <br />A geotechnicalfield investigation program was conducted <br />as part of the original application. This program is discussed <br />• in Section D.3.2.2 and presented in Appendix C of the approved <br />permit. Based on the results of this program, the sites are <br />underlain by relatively deep colluvial/alluvial deposits of <br />silty and gravelly sands similar to those found elsewhere on <br />the project site. <br />D.3.3 Material Characteristics <br />The material characteristics for the waste rock, both <br />geotechnical and geochemical, outlined and approved as part <br />of the existing permit have been used in the design of the <br />amended waste rock disposal areas since the waste rock material <br />is the same in either case. A complete discussion of these <br />characteristics can be found in Section D.3.3 of the approved <br />permit and is briefly summarized below. <br />The Santa Fe Conglomerate i s anticipated to be the 1 east <br />competent constituent material of the waste rock. The waste <br /> <br />D-4 <br />