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1 <br />' Minor grading will also occur along the crown of the bench to assist in <br /> <br /> <br /> <br />1 <br />1 <br /> <br />1 <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br />~~ <br />shedding runoff. The long dimension of the mine bench will slope towards <br />the south at about a 7 to 10 percent grade. The mine bench is anticipated <br />to be around 150 feet or so in width. <br />In order to minimize the size of water catchment areas and length of <br />slope on the mine bench, drainage to the outside of the bench will be <br />controlled by the construction of several simple periodic swales across the <br />bench. These will be constructed subperpendicular to the direction of <br />slope and will function to divert water to the adjacen[ slope; riprap will <br />be placed at outfall areas where the runoff is directed in order to <br />minimize incision and sedimentation potential. In addition, ditches along <br />the access road and the minor sediment trap described in Exhibit B will <br />remain on site until vegetation has been established with sufficient cover <br />to minimize erosion. <br />During the course of operations, any recoverable topsoil will be <br />stripped and stockpiled for use in reclamation. Additionally, any sediment <br />which may accumulate in the sediment trap will be removed and used as a <br />growth medium to augment the available soil. Any soil salvaged will be <br />placed on the mine bench and adjacent disturbed areas to a minimum depth of <br />about 6 inches to the extent soil is available. Live handling of soil will <br />occur when possible. Each mound of overburden backfilled against the <br />highwall will be planted with 12 one-inch diameter ponderosa pine. The <br />disturbed areas will be reseeded will the mixture given below. This grass <br />mixture, and seeding rates, was recommended by the Jefferson County Soil <br />Conservation District (and approved as part of the rezoning) for the <br />affected area following a review of the company's application to Jefferson <br />County. <br /> <br />