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South Hinsdale Response to Objections <br /> 12 July 2022 <br /> h <br /> ".ems <br /> Reaig^,mcnt of Klecl nccr tare no:show. _ <br /> r r"' pth of mining 20 da feet liTftec by basement shale. <br /> Berm and sha lye excavat}c n Slope of floor between 5H:1V to 204:1V skrpe <br /> Outside ROW*Or Sediment la.Wrs. <br /> For purposes of preventing discharge of water associated with the mining, there will be <br /> areas excavated 3-6 feet below the elevation of Piedra Road, OUTSIDE the ROW, and <br /> with slopes no steeper than 3H.-1 V. These will be about 20 feet above the OHWM of the <br /> river, or higher. As mining and reclamation progress, basins may be moved further from <br /> the road and backfilled to reduce their depth but still provide capacity to allow water to <br /> evaporate and infiltrate, so that there is less chance of any discharge. There will be berms <br /> of varying height and width along the outside of the ROW to provide reduced visual, sound, <br /> and odor/dust impact to users of Piedra Road and others within viewshed. <br /> (Please note that although shown on Google Earth, there is NOT a campground on the near bank <br /> of the Piedra north of the permit area. Also note that maps in Exhibit E now show general grade <br /> information ("3H:1 V"etc.) to help understand the post-mining terrain (in addition to contour lines). <br /> This has been confirmed through coordination with the Piedra Ranger District. <br /> County Specific Comment 13): armored outfall, design requirements, receiving waters. <br /> (Discharges north of Kleckner Lane) <br /> Response: WASTELINE Inc. and the Preparer (a Colorado-licensed Professional <br /> Engineer) have designed and constructed or supervised construction of hundreds of <br /> surface water control measures and associated structures, since 1978. These are often <br /> field-designed but based on standard plans and specifications of CDOT, other State DO Ts <br /> and environmental regulators, US Army Corps of Engineers, USFS, National Resource <br /> Conservation Service, various professional societies, and original designs prepared by us <br /> and other engineering firms. The designs are based on standard precipitation frequencies <br /> and shallow-pan or pond evaporation data (National Weather Service and cooperating <br /> climate centers) for the specific location, length of service required, runoff constants for <br /> specific sites, anticipated sediment loading, available materials, availability of secondary <br /> containment for water-priority chemicals, local agency requirements (if they exist), and <br /> years of experience in designing, building, maintaining, removing, and inspecting such <br /> measures. <br /> 5182-22-003 WASTELIN£, INC. Page 57 of 107 <br />