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environmental impact, the yellow, fine-grained matrix is visually similar to the stream- <br /> side tailings and may therefore contain similarly elevated concentrations of lead. <br /> The stream-side tailings and additional intermixed tailings piles will be regraded to <br /> achieve stable slope configurations prior to covering. Side slopes will typically be no <br /> steeper than a horizontal slope of 2:1. Tops will be rough-graded to range from <br /> approximately horizontal to slopes of less than 10%. Areas to be covered will be <br /> identified visually based on the previous site assessment work by CDPHE and further <br /> observations by Summit County personnel. <br /> The regraded stream-side and intermixed tailings piles will be covered using dredge rock <br /> from the Swan River valley near the iXURoyal Tiger site. A minimum cover thickness of <br /> 9 to 12 inches will be achieved, depending on the clast size of the dredge rock placed on <br /> any particular pile. Due to the coarse nature of the dredge tailings, the cover will be <br /> allowed to follow the underlying graded contours without further grading after placement. <br /> Covering the stream-side and intermixed tailings will effectively eliminate direct contact <br /> by humans and wildlife. This action will also reduce or eliminate water and wind erosion <br /> of the tailings material, thereby reducing the potential transport of metals from these <br /> sources into the environment. <br /> 9.2.6 Institutional Controls <br /> Institutional controls will be implemented to further reduce potential risks to human <br /> health at the iXURoyal Tiger site. Public usage will be limited to open space and <br /> recreational uses with overnight camping prohibited at the site. Hiking trails will be <br /> routed away from the surface of the waste-rock pile. Approximately 1,000 feet of fencing <br /> will be installed to prevent direct access to the waste-rock pile. The approximate <br /> location for fencing shown in Figure 3 assumes that the existing road through the site will <br /> remain open to public use. Signage will also be installed describing the mining history <br /> of the site and warning recreational users to avoid contact with the waste-rock materials. <br /> The use of appropriate institutional controls will limit human contact with remaining <br /> impacted materials at the site. This will also preserve the historical nature of the <br /> IXURoyal Tiger site. <br /> 9.3 Permits <br /> Work performed pursuant to this VCUP application will be performed in compliance with <br /> the administrative and substantive requirements of federal, state, and local permitting <br /> authorities. <br /> Because a portion of the work will be performed within the Swan River channel,a permit <br /> for such work will be obtained from the Army Corps of Engineers. We anticipate that the <br /> work can be completed under a general Section 404 permit; however,if that is not the <br /> case a site-specific permit will be obtained prior to initiating the phases of work within the <br /> stream channel. <br /> A grading and drainage plan will be submitted for review and approval by the Buyers. <br /> The appropriate grading and drainage permit will be obtained by the contractor before <br /> site work commences. <br /> Based on conversations with CDPHE personnel and experience at other similar sites, <br /> we do not believe that the improvements to the alit drainage will require a National <br /> Pollutant Discharge Elimination System (NPDES)permit. The NPDES program is <br /> EXURoyal Tger VCUP Application _.... .... - "Pa go 26 of 33 <br />