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construction will be comprised of native soil, end no spoil materiels will be used for • <br />bat kfilling these crossings within the buffer zone. Conveyance ditches proposed along <br />Haul Road B et culvert YB-b will k>e designed to feature sufficiently low gradients (.02 <br />ftlft average), and in combined or. with riprepped downdre(ns to the Armand Draw stream <br />channel, will adequately convey runoff from the haulroad without contributing significant <br />additional suspended soilds. <br />The crossing of Scotchman's Gulch nt Culvert YA-6 along Haul Road A will be comprised of <br />two 72-inch CNP culverts riprepped at both up-end downstream ends similarly backfilled <br />with native materials, and are designed to pass the 10-year 24-hour runoff event. <br />Riprepped downdrains will be constructed along the haulreod at this crossing to convey <br />runoff from the low gradient (.OZS ft/ft average) ditches proposed to control heulroad <br />runoff. The ditches will be designed to adequately convey the 10-year, 24-hour runoff <br />volume, and in combination with the low gradient design and riprepped downdrains, will <br />prevent additional significant contributions of suspended soilds to Scotchmen's Gulch. <br />Following reclamation grading, salvaged tposoil will be replaced et each crossing and will <br />be disked to partially tie in with the adjacent undisturbed vegetation. Revegetation • <br />methods will follow those described in Tab 22, Revegetation. An appropriate seed mixture <br />which contains a number of the native species found in the stream disturbance areas as <br />well as other desirable species, will be used for revegetation. <br />The impact of the culvert crossings along Armand Draw and Scotchman's Gulch on the <br />hydrologic balance should be negligible. The disturbance areas ere minimal end do not <br />significantly affect the main channels. Haul road ditches are properly designed. Salvaged <br />topsoil will be replaced and a seed mix containing native species will be used to <br />revegetate the disturbance area when it is reclaimed. <br />Vater Rights and Alternative Water Suoolies <br />Introduction. Adjudicated surface and ground water rights, as well as unadjuditated water <br />sources within and adjacent to the Yoast Mine have been investigated with regard [o <br />SCC's proposed operation of the Yoast Mine. Table 16-1 provides a listing of water rights <br />investigated including locations, decreed amounts, use classifications and adjudication <br />dates. Exhibit 16-1 depicts the locations of the water rights presented in Table 16-1, • <br />including one unadjuditated, recently-drilled well along Sage Creek used for domestic <br />drinking eater end two unadjuditated small stock tanks. <br />B Revised 03/01/95 <br />