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Probable Effects on Ground Water Quantity: <br />The Lewis shale is an aquitard and should not be much affected by any additional <br />waters that might be contributed to the site as a result of mining operations at <br />the loadout. Water used at the site is drawn from Yampa River alluvium. It is <br />conceivable that waters seeping from sediment ponds and from the operation's <br />leach field may contribute additional water to Dry Creek's alluvium but it is not <br />expected to be significant. <br />Pursuant to Rule 2.07.6(2)(c), the assessment of the probable consequences of the <br />proposed mining operation and the assessment of the probable cumulative impact <br />of all anticipated mining in the area on the hydrologic balance, as described in <br />Rule 2.05.6(3), have been made. The proposed operation has been found to be <br />designed to prevent material damage to the hydrologic balance outside the permit <br />area. <br />IV. TOPSOIL -RULES 2.04.9. 2.05.3(5, . 2.05.4(21(dl AND 4.06 <br />Information regarding soil resources and salvage may be found in Tab 9, Tab 17, Tab <br />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 from <br />1977 to 1979. This facility was previously permitted under Permit No. C-80-003. <br />Topsoil was stripped from the facilities site, rai]road spur, and railroad loop and <br />stockpiled. All suitable A horizon topsoil and some upper B horizon subsoil material <br />was salvaged. <br />Existing topsoil stockpiles were inventoried in November 1992 to confirm volumes <br />and suitability of stockpile material. Results of this inventory are located in <br />Attachment 9-1 of the permit. Approximately 55,100 cubic yards of soil material have <br />been stockpiled. Analyses of the stockpiled material indicate elevated SAR and <br />increased salinity levels at the lower depths of topsoil piles #1 and #3. Due to these <br />factors, somewhat less than the 55,100 cubic yards of the stockpiled topsoil material <br />will be redistributed on disturbed areas during reclamation. This volume will allow <br />for replacement depths of 6 to 9 inches over 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 salvageable from 0- to 9- <br />inch depths while the unnamed soil is suitable for topsoil salvage from 0 to 24 inches. <br />zz <br />