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D.3.2 Site Descriptions <br />• D.3.2.1 Waste Rock Disposal Area A <br />Area A is the western most waste rock disposal location <br />north of Rito Seco. Natural ground slopes at Area A vary from <br />2.5H:1V to 20H:1V with an average slope of approximately <br />15H:1V. Vegetation at the site is characterized by sagebrush <br />flats in the lower reaches and pinion juniper woodlands in the <br />upper reaches. Soils are primarily Blackhall sandy loam. <br />Exhibits I and J of the approved permit contain a complete <br />discussion of the soiis and vegetation within the permit area. <br />The original disposal area was designed to cover 40 acres <br />and store 4,320,000 tons of waste rock. The disposal area size <br />has been reduced by approximately 52 percent and now covers <br />approximately 19.2 acres and is designed to store approximately <br />700,000 tons of waste rock. <br />• As part of the original permit application a geotechnical <br />field investigation program was conducted throughout the permit <br />area including the area of Waste Rock Disposal Area A. The <br />results of this geotechnical investigation are discussed in <br />Section D.3.2.1 and presented in Appendix C of the approved <br />permit. These results indicate that Area A is generally <br />underlain by a deep colluvial/alluvial deposit composed <br />predominately of poorly consolidated silty and gravelly sands. <br />Beneath the alluvial/colluvial material lies the Santa Fe <br />Conglomerate. <br />D.3.2.2 Waste Rock Disposal Area D and South Waste Rock Disposal <br />Area <br />The South Waste Rock Disposal Area lies north of the <br />plant and crusher area and south of the Rito Sec:o. The South <br />Area covers approximately 125 acres and is capable of storing <br />D-3 <br />