2002-11-25_REVISION - M1977344 (2)

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d. The operator should provide detailed hydrologic information, including the anticipated maximum flow, for the 100 yeaz - 24 hour precipitation event (saturated conditions). e. Does the operator plan to construct drop structures/energy dissipaters at the outlet of the last component of the constructed channel/creek? If so, provide plans and specifications for construction of the dissipaters. f. Are there any current plans to construct erosion control structures in the last component of the revised drainage? If not, why not? Significant precipitation events will increase runoff through the existing arroyo (the drainage will need to convey all water from the upland watershed plus all of the newly introduced runoff). The extra runoff may increase the chances [hat flood conditions will occur in the ravine, since there isn't much room for the flow to spread out until it gets to the Arkansas River. Provide plans for erosion control in this azea and specifications for any needed structures Exhibit H -Wildlife Information 32. The Colorado Division of Wildlife in reviewing your application recommended alternatives to the diversion of Beaz Creek for 7,155 feet based on impacts to wildlife and the cumulative impacts downstream. The DOW believes that the diversion of the creek will result in the removal of all wetlands/riparian habitats, which will severely impact the wildlife resource on and adjacent to the property. Beaz Creek provides excellent potential habitat for Arkansas Darter (State Threatened) and Southern Red $elly Dace (State Endangered). The DOW suggests [hat mining occur in increments, to allow proper reclamation of affected lands before moving on to the next area. The DOW also suggests designating stream crossings for mining equipment and areas of impact to minimize the influence of mining to Beaz Creek and the Arkansas River. The DOW suggests that reclamation efforts provide the same form, function, and value that existed previous to mining operations. The DOW is not in formal opposition to the proposed amendment. We suggest that Holcim contact Casey Cooley of the DOW at 719-277-5200 and discuss with him what Holcim is proposing to mitigate the destruction of wetlands and riparian habitat. Holcim, afrer talking with Mr. Cooley, may wan[ to consider revising the mining and reclamation plans [o include the restoration of Bear Creek. Provide your response to the these DOW concerns in this exhibit. Exhibit L -Reclamation Costs 33 The regulations, at Rule 6 Section 4.12, requue that the application include all information necessazy to calculate the costs of reclamation and that the information must be submitted and broken down into [he various major phases of reclamation. The information provided by the operator/applicant must be sufficient to calculate the cost of reclamation that would be incurred by the state, The Division will want to review reclamation cost information based on the worst case situation, which will most likely exist when the topsoil and overburden aze removed from the cut 2 and 3 areas. At that time, the pit in the northwest corner will most likely still be open with vertical highwalls and it is the Division's understanding that the overburden from cuts 2 and 3 will be located on the west side of Beaz Creek. Provide the information necessazy to complete backfill operations; site grading [o approved reclamation slopes; topsoil replacement to the required depth and revegetation including soil tillage operations, seed and seeding operations, fertilization, mulching and weed control in accordance with your reclamation plan. Provide volumes of material remaining to be blasted plus blasflng costs to [educe highwalls to 3h:ly slopes. Provide the volume of material to be hauled to pit backfdl sites and the haul distances. Provide this same information for topsoil hauling and placement. For all structures in the permit azea to be removed upon reclamation, provide enough information about their construction to calculate the cost of removal. Please also provide disposal plans and disposal costs. Include information about dimensions and types of materials structures aze constructed of. For concrete structures provide information on thickness of the concrete and whether it is reinforced. Include the same information for building foundations and floors and paved surfaces. Provide the lineaz feet of railroads to be removed from the permit azea.