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RULE 2 PERMITS <br />• The soils field and laboratory data were compared to the standard soil suitability criteria and threshold <br />values to determine the suitability of each soil horizon and map unit. Soils, or portions of the soil <br />profiles, that are considered "suitable" or "marginal" are recommended for salvage. Soils, or portions of <br />the soil profiles, that are considered "suspect" or "unsuitable" were not recommended for salvage. <br />Professional judgment was employed regarding soil suitability if one parameter slightly exceeded the <br />threshold value while all others were considered "suitable". <br />The following parameter threshold values were considered "suspect" or "unsuitable" as used in the <br />suitability evaluation of Lower Wilson soils: <br />• pH <5.0 or >9.0 <br />• EC (conductivity) >12 <br />• Saturation percent <25% or >80% <br />• SAR (Sodium Adsorption Ratio) >I3 (for soil with >40% clay), >15 (for soil with <40% clay) <br />• Texture, clay >40% <br />• Selenium >0.1 ppm <br />• Boron >5 ppm <br />• Coarse fragments >35% <br />Soil Resource Assessment Results <br />Eleven soil map units were delineated in [he Lower Wilson soil survey areas including small areas of the <br />Wilson Creek road corridor (Map Unit DL) and the Wilson Creek drainage channel (Map Unit WC). The <br />following is a list of soil map units for the Lower Wilson Mine Area (595 acres) and the Lower Wilson <br />North Haul Road Area (21 acres): <br />Lower Wilson Mine Area <br />Map Unit A: Adderton sandy loam, 2 to 10% slopes <br />Map Unit B: Cochetopa sandy loam, 4 to 25% slopes <br />Map Unit C: Rhone loam, 25 to 65% slopes <br />Map Unit D: Campspass -Rhone Complex, 25 to 65% slopes <br />Map Unit E: Lamphier sandy loam, 25 to 65% slopes <br />Map Unit F: Danavore - Waybe -Rock Outcrop Complex, 6 to 45% slopes <br />Map Unit S: Silas sandy loam, 2 to 15% slopes <br />Map Unit DL: Disturbed Land <br />Lower Wilson North Haul Road Area <br />Map Unit 10: Battlement fine sandy loam, 2 to 10% slopes <br />Map Unit 216: Yamo fine sandy loam, 4 to 15% slopes <br />Map Unit WC: Wilson Creek drainage <br />Map Unit DL: Disturbed Land <br />I• <br />South Taybr/Lower Wilson -Rule 2, Page 56 Revision Date: 11/30/06 <br />Revision No.: PR-02 <br />