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2.05.3 <br />drainage plan for the site were prepared under the direction of Tammerin K. <br />Stover - Bishop, Colorado Professional Engineer, No. 43402. <br />A description of the ponds are presented above. Detail drawings of the ponds <br />are presented on Map No. 13. <br />The preliminary hydrologic and geologic information required to assess the <br />hydrologic impact of the structures is included in the vegetation information, soils <br />report, and alluvial valley floor report, located Volume I, Exhibit 5, 7 and 14 <br />respectively in Volume I. <br />No underground mining has occurred under any of the sediment ponds and none <br />is anticipated. <br />Not applicable. <br />(ii) Detailed Design Plans <br />(ii)(A) Sediment ponds 1 -3 and the drainage plan for the rail spur and loadout were <br />prepared under the direction of Tammerin K. Stover - Bishop, Colorado <br />Professional Engineer, No. 43402. <br />(ii)(B) Topsoil will be salvaged from a small portion of pond #2; ponds #1, 3 and the <br />remaining portion of pond #2 are in previously disturbed areas and no topsoil is <br />available for salvage. Ponds will be excavated to depths shown on Map -13, with <br />side slopes not to exceed 2HAV. Excavated material will be placed in the <br />Construction Materials Storage pile. Side slopes will be tracked with a dozer to <br />assure the cut slopes are firm and stable. <br />Ponds 1 - 3 will be lined with a 12 -inch thick low permeability soils liner. The soils <br />liner is proposed to be constructed using native clay soils or native soils amended <br />with bentonite. For the native soils proposed to be used as liner material, pre - <br />construction testing will initially include grain size analysis, Atterberg limits <br />determination, Proctor, and hydraulic conductivity to determine whether or not the <br />native soils can meet the Hydraulic Conductivity specification of 1x10'' cm /sec. <br />Where the native soils are determined to be capable of meeting the specification, <br />the remainder of the borrow material testing will be completed as outlined in <br />Exhibit 20, Table 1. Where the native soils are unable to meet the Hydraulic <br />Permit Application 2.05 -18 01/12 <br />