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110 Permit Application Colorado Division of Reclamation, Mining and Safety <br />I RECLAMATION PLAN -EXHIBIT D <br />' BDM has prepared responses to each of the review standards in Section 6.3.4 in the <br />Construction Material Rules and Regulations. The review standard is stated followed by BDM's <br />response. <br />' (1) Rule: The purpose of the Reclamation Plan is to describe the timing, procedures, criteria and <br />materials that will be used to reclaim the affected land to the proposed future land use. This plan <br />must be correlated to Exhibit E - Map. The description of the Reclamation Plan must be <br />adequate to satisfy the requirements of Section 3.1 and demonstrate compliance with Rule 3. At <br />a minimum, the Application shall include the following information: <br />' (A) Rule: specify at what point in the mining plan and to what depth(s) overburden will be <br />replaced in relation to ongoing extraction. <br />' Response: No overburden is anticipated to be generated during the mining other than <br />topsoil suitable for the revegetation of portions of the permit area. While not anticipated <br />to be generated, waste rock if generated, would be stockpiled adjacent to the topsoil <br />' stockpile and during reclamation would be graded in along the toe of the cut face to <br />moderate the transition between the pit bottom and the cut face. <br />(B) Rule: specify the maximum gradient of reclaimed slopes (horizontal:vertical). If the <br />Application proposes slopes steeper than 3:1, the Operator/Applicant must include a <br />justification that supports steeper slopes for the proposed post-mining land use, and <br />demonstrates compliance with the applicable performance standards of Section 3.1. <br />Response: The pit bottom (Exhibit E) will be graded to an approximate slope of <br />8(H):1(V). The slope in this area will be kept shallow to enhance the potential for the <br />' limited available topsoil to successfully establish vegetation and to minimize erosion. <br />The cut face or highwall is proposed to be left at final slopes of no stepper than <br />1.8(H):1(V) slope below the bench and no steeper than 1.2(H):1(V) above the bench. A <br />25 foot wide bench will be constructed across the face of the highwall to break the slope <br />into upper and lower sections to increase the stability and safety of the remaining slope. <br />A shallower slope is not being proposed due to minimize the disturbance area and the <br />' technical infeasibility of laying back the slope by excavating further into to the hillside. <br />The final highwall will be comprised of competent bedrock with relatively flat lying <br />bedding that will be scaled to remove loose rocks, resulting in a stable slope that is <br />relatively resistant to erosion. <br />(C) Rule: specify the measures that will be taken to revegetate the site. <br />(i) Rule: state the thickness of plant growth medium to be replaced. Sample and <br />analyze available soils sufficiently to establish quantity and quality. <br />Response: Salvagable plant growth medium is limited at the site due to previous <br />disturbance of the proposed pit area. Approximately 1,200 square feet of topsoil <br />is present on the south end of the pit. This is the approximate extent of new <br />disturbance at the pit. Following mining, the salvaged soil will be placed at the <br />toe of the highwall or bench, excepting any topsoil windrowed around the <br />margins of the pit highwall. The placement of the topsoil at the toe of the <br />highwall will occur in a 6 inch lift. The location of the topsoil placement is <br />Tetra Tech April 2008 (July 2008 Application Amendment Page) 12