2005-12-27_REVISION - M1992054 - Laserfiche WebLink

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Please include the stormwater runoff control structures within the phases or affected area. If the structures are to be within the natural drainageway(s) please include an appropriate engineering evaluation supporting the adequacy of the capacity (evaluation to be placed under Exhibit G). Discussion during the 12/13/05 pre-operation inspection included a likely new entrance location and access road. The map(s) should include that, and all other revised roadway locations. The main onsite haul road roughly paralleling the buried waterline crosses two arroyos, though there is no improved crossing structure in either arroyo. If such structures are to be installed to support the mining operation, please include them on the maps, and the descriptions under Exhibit D. Exhibit D - Minine Plan (Rule 6.4.4) Please clarify several items concerning highwall reclamation: what will be the maximum slope of the highwall during mining; what will be the maximum length of the active highwall during mining; what method of highwall reduction will be used (e.g., cut and fill, or backfilling). An important part of the reclamation costs is the earthwork required for reduction of the highwall gradient to meet the 3:1 slope for reclamation. The plan states that there will be a maximum of 20 acres disturbed by mining. Since "mining" (per Rule 1.1(27)) includes all activities and disturbances associated with an operation, this statement must extend to include haul roads, stockpile areas, processing areas, and equipment storage areas, etc. For bonding purposes it must also include areas that were affected but not yet fully reclaimed. Please revise this acreage figure if necessary. Please state whether mining will expose the underlying sandstone. To attain adequate rangeland vegetation during reclamation, a minimum depth of material, including topsoil, must overlie the sandstone. If mining exposes the sandstone, then more backfilled material must be replaced as part of reclamation, which will affect the bond amount. There are several stmctures and features that could be adversely impacted by mining or reclamation earthwork, or by mine traffic. Please clarify what the minimum setback distance(s) will be between your activities and the following features: overhead electric powerpoles, buried gaslines, sandstone outcrops (arroyo rims), gas wells or pads, gas well roads, buried waterlines, and imgation ditches. Please specify what the slope gradient will be for powerpole pedestals after mining. The slope gradient during mining as well as the depth of mining will affect the width of unmined land around the margin of the pit that is necessary for performing reclamation. Stockpiling of overburden and topsoil along some of these pit margins may necessitate need for additional room for equipment maneuvering. Please ensure that sufficient unmined land is allowed to remain so that reclamation can be performed according to your plan. The overburden and topsoil that are to be sepazately stripped and stockpiled, are also assumed to be separately replaced. Is this correct? While in stockpile prior to reclamation, will both the overburden and topsoil be vegetated? What will they be vegetated with, and at what rates? Please include a noxious weed control plan to be followed during the mining stages. Exhibit E -Reclamation Plan (Rule 6.4.5) Please provide more details about the overburden and topsoil replacement. Since some of these materials to be replaced maybe stockpiled several hundred feet from where they are to be placed during reclamation, please clarify what types of equipment will be used. Please specify the minimum depth of material, to remain or to be placed, over the sandstone bedrock. If less than two feet is proposed, please describe how the bedrock layer will be prepared (such as by fracturing) to provide adequate rooting depth.