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At Colowyo, soil pH ranges from 7.5 to 7.8, macronutrients appear to be adequate for <br />sustained plant growth, organic matter contents are relatively high (3.7% to 4.8%), salt <br />levels are low (EC ranges from 0.6 to 1.2 mmhos/cm and SAR ranges from 0.3 to 1.6), <br />cation exchange capacity (CEC) is in a normal range, and textures are clay loam and <br />sandy clay loam. The detailed soil and overburden analysis for the Colowyo Mine is <br />provided below. <br />Parameter Plot V Plot 2b Plot Y Plot 4d Plot 5e <br />pH 7.5 7.5 7.5 7.7 7.8 <br />% OM 4.1 4 4.8 4.1 3.7 <br />NH4-N mg/kg 4.9 4.6 6 6.1 8.7 <br />N03-N mg/kg 24.1 19.1 22.3 13.7 18.1 <br />P mg/kg 15 9.6 12 7.8 29 <br />K mg/kg 191 210 201 95.1 105 <br />Ca meq/L 4.9 4.1 4.4 3.5 5.5 <br />Mg meq/L 2.6 1.6 2 2.4 4.1 <br />Na meq/L 0.8 0.6 1.3 1.9 3.5 <br />K meq/L 0.2 0.5 0.4 0.2 0.2 <br />EC mmhos/cm 0.7 0.6 0.7 0.7 1.2 <br />SAR 0.4 0.3 0.8 1.1 1.6 <br />CEC meq/100g 26.8 22.1 22.9 27 23.3 <br />% Sand 41 51 48 39 41 <br />% Silt 23 23 23 23 25 <br />% Clay 36 26 29 35 35 <br />Texture clay loam sandy clay loam sandy clay loam clay loam clay loam <br />aPlot 1 = 18 inches of topsoil, strip seeding in alternate rows. <br />bPlot 2 = 6 inches of topsoil and surface manipulation, seeded with native shrubs and <br />low competitive forbs. <br />°Plot 3 = 6 inches of topsoil, strip seeding in alternate rows. <br />dPlot 4 = Non-topsoiled spoil, strip seeding in alternate rows. <br />ePlot 5 = Non-topsoiled spoil, seeded with unpalatable native shrubs and low <br />competitive forbs and grasses. <br />To evaluate the impact from wildlife browsing, elk proof fencing was constructed on one- <br />half of each treatment. <br />Colowyo Mine Specific Field Trial <br />At the Colowyo Mine, field trial treatments to be evaluated include five plot treatments as <br />shown on Figure 4.15-1. <br />1. 18 inches of live-haul topsoil over spoil with strip seeding. The strip seeding <br />4.15-7 Revision Date: 3/14/08 <br />Revision No.: TR-72