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<br />~ slight potential for acid production. If these materials are handled <br /> separately, please describe what mitigation is proposed to ensure that <br />I the interburden will not be acid-forming. If the waste material is <br />combined during disposal, describe the projected composite effect for <br /> acid-production potential. <br /> Response: The interburden has demonstrated no acid generation. BMR is <br /> unsure why the Division believes that the interburden has a <br /> slight potential for acid production. Acidification <br /> neutralization tests indicate the presence of small amounts of <br /> pyritic sulfur (0.39% and 0.15%) with some to moderate amounts <br /> of neutralizing agents present in the rock. The humidity cell <br /> tests were performed to determine if the pyritic sulfur would <br /> react to allow acid production. The results of the eight week <br /> humidity cell tests, which were designed to represent long term <br /> field conditions, indicate no acid production, no significant <br /> changes in pH and no significant mobilization of sulfur. <br />t Therefore, no mitigation measures are necessary. <br /> No application change necessary. <br /> Section D.3.4 Facility Construction <br /> Section D.3.4.1 General <br /> 11. Pease specify the methods and disposal locations for vegetation <br /> removal planned for the various facility locations. <br />' Response: Smaller vegetation and brush will be mulched into the topsoil <br /> prior to topsoil removal,~if possible. Larger trees and brush <br />< will be cut for firewood and/or burned. <br />~ <br /> No application change necessary. <br /> 12. Please specify the depth of topsoil and subsoil removal proposed for <br />' each of the facility locations. <br /> Response: As discussed in Exhibit: I and shown on Figure I-1, most of the <br /> mill and leach pad facilities area as well as the southern waste <br /> rock disposal area lie in Blackhall Gravelly Sandy Loam. These <br /> soils exhibit topsoil six to eight inches thick and deep <br /> subsoils. Approximately 12 inches of the soils in this area will <br /> be salvaged. The lower slopes of the northern waste rock disposal <br /> areas also lie in Blackhall Gravelly Sandy Loam and similar <br /> quantities will be salvaged from these areas. The upper slopes <br /> of the northern waste rock disposal areas lie in Uracca-Morval <br /> Complex soils which include four to six inches of topsoil and a <br /> rocky subsoil. Approximately twelve inches of soil will be <br /> salvaged from these areas where possible. Finally, the pit areas <br /> lie in Comodore-Blackhall Complex soils. These soils vary from <br /> the Comodore soils of shallow stony looms over bedrock to deeper <br /> Blackhall soils. In some areas of the pit, bedrock is exposed at <br />' the surface. Twelve inches of soil will be salvaged where <br /> possible although organic matter may be lacking in some of the <br />' soil salvaged. For more information on project area sods the <br /> <br />