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• Introduction <br />Peabody proposes to construct stock tanks in the reclaimed drainage <br />channels at the Seneca II Mine. These small tanks will benefit both <br />livestock grazing and wildlife utilization of the reclamation. This <br />will enhance the postmining land use at the reclaimed areas. These <br />stock tanks will slow the peak runoff of precipitation events and help <br />to minimize erosion in the drainage channels. See Exhibit 7-7 for <br />location of existing and proposed stock tanks. <br />Design <br />The stock tanks will be structures to enhance postmine wildlife and <br />livestock utilization. The capacity of the tanks will be not more than <br />two acre-feet and the vertical height of the embankment will be five <br />feet or less, as measured from the upstream toe of the dam to the bottom <br />of the emergency spillway. The drainage area of the tanks will be large <br />enough to maintain an adequate supply of water into the tank. All stock <br />tanks will be created in channels which are normally dry. <br />Construction <br />All stock tanks will be constructed according to State of Colorado, <br />Office of State Engineer's "Specifications to Govern the Construction of <br />a Livestock Water Tank" and USDA Soil Conservation Service's <br />specifications for tanks. These specifications are contained in <br />Addendums 1 and 2. Access to tank sites in reclaimed areas during the <br />construction phase will be accomplished, when possible, by trucking a <br />dozer down existing drainages to minimize damage to vegetation. If <br />necessary, access routes to the construction sites will be reseeded with <br />the approved seed mix. All topsoil will be salvaged prior to tank <br />construction and spoil material will be used for construction of the dam <br />embankment. After construction, topsoil will be replaced on the dam and <br />adjacent disturbed reclaimed areas above the elevation of the emergency <br /> <br />13-9-1 Revised 02/06/91 <br />