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<br />.~ <br />operation's lzach fseld may contribute additional water to Dry Creek's <br />alluvium but it is not expected to be significant. <br />Pursuant to Rule 2.07.6(2)(c), the assessment of the probable consequences of <br />the proposed mining operation and the assessment of the probable cumulative <br />impact of all anticipated mining in the azea on the hydrologic balance, as <br />described in Rule 2.05.6(3), have been made. The proposed operation has <br />been found to be designed to prevent material damage to the hydrologic <br />balance outside the permit area. <br />IV. TOPSOIL -RULES 2.04.9.2.OS.3(sl. 2.OS.4(211d1 AND 4.06 <br />Information regazding soil resources and salvage may be found in Tab 9, Tab 17, <br />Tab 19, Attachment 9-1, 9-2, 9-3, 9-4, and Exhibit 9-1 in the permit. <br />The Hayden Gulch Terminal loadout facility and railroad spur was constructed - <br />from 1977 to 1979. This facility was previously permitted under Permit No. C-80- <br />003. Topsoil was stripped from the facilities site, railroad spur, and railroad loop <br />and stockpiled. All suitable A horizon topsoil and some upper B horizon subsoil <br />material was salvaged. <br />Existing topsoil stockpiles were inventoried in November 1992 to confirm <br />volumes and suitability of stockpile material. Results of this inventory aze located <br />in Attachment 9-1 of the permit. Approximately 55,100 cubic yazds of soil <br />material have been stockpiled. Analyses of the stockpiled material indicate <br />elevated SAR and increased salinity levels at the lower depths of topsoil piles #1 <br />and #3. Due to these factors, somewhat less than the 55,100 cubic yards of the <br />stockpiled topsoil material will be redistributed on disturbed azeas during <br />reclamation. This volume will allow for replacement depths of 6 to 9 inches over <br />54 acres of disturbance. <br />Soil mapping units identified during a Soil Conservation Service survey consist of <br />Spicerton variant, an unnamed soil type occurring along the first terrace of Dry <br />Creek, and Morapos soil types. The Spicerton variant soil exhibits elevated SAR <br />values below a 1-inch depth and high EC levels below 8 inches. The Spicerton <br />variant soils are not recommended for topsoil salvage. The Morapos soils and the <br />unnamed soil mapping unit have loamy to silty clay loam textures and no limiting <br />characteristics in the surface horizons. The Morapos soil is salvaeeable from 0- to <br />9-inch depths while the unnamed soil is suitable for topsoil salvage from 0 to <br />24 inches. <br />Anticipatzd new disturbance associated with the reopening operations at the <br />loadout is limited to 0.2 acre associated with construction of haul road number <br />two. This proposed disturbance is within the Disturbed Land, Topsoiled mapping <br />unit. HGTL will salvage all suitable topsoil prior to construction of this haul road. <br />