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Balsamorhiza sagittata Arrowleaf balsamroot 1.0 <br />Lupinus alpestris Mountain lupine 1.0 <br />Linum lewisii Lewis flax 1.0 <br />Penstemon Palmeri Palmer penstemon 0.5 <br />Penstemon strictus Rocky Mountain penstemon 0.5 <br />Shrubs: <br />Purshia tridentata Antelope bitterbrush 3.0 <br />Amelanchier utahensis Serviceberry 3.0 <br />Symphoricarpos albus Snowberry 3.0 <br />Rosa woodsii Woods rose 2.0 <br />Ribes aureum Golden currant 2.0 <br />Prunus virginiana Chokecherry 4.0 <br />TOTAL 25.0 <br />Table 5. Native shrub and forb seed mixture (seed mix #5) for demonstration plots at the Seneca Mine. <br />Scientific name Common name Seeding rate in lbs pls/a <br />Shrubs: <br />Purshia tridentata Antelope bitterbrush 3.0 <br />Amelanchier utahensis or alnifolia Serviceberry 3.0 <br />Symphoricarpos oreophilus Snowberry 3.0 <br />Rosa woodsii Woods rose 2.0 <br />Ribes aureum Golden currant 2.0 <br />Prunus virginiana Chokecherry 4.0 <br />Forbs: <br />Balsamorhiza sagittata Arrowleaf balsamroot 1.0 <br />Lupinus alpestris Mountain lupine 1.0 <br />Soil Analyses <br />Linum lewisii Lewis flax 1.0 <br />Penstemon Palmeri Palmer penstemon 0.5 <br />Penstemon strictus Rocky Mountain penstemon 0.5 <br />TOTAL 21.0 <br />In order to establish the suitability of the demonstration sites and treatments for plant growth, composite soil <br />samples were collected from each demonstration plot on April 25 and 26, 2001 and analyzed at the Soil, Plant <br />and Water Testing Lab at Colorado State University. <br />Overall, the soils (topsoil and spoil) at all three mine sites have good physical and chemical properties (Tables <br />6-8). At Colowyo, soil pH ranges from 7.5 to 7.8, macronutrients appear to be adequate for sustained plant <br />growth, organic matter contents are relatively high (3.7% to 4.8%), salt levels are low (EC ranges from 0.6 to <br />1.2 mmhos/cm and SAR ranges from 0.3 to 1.6), cation exchange capacity (CEC) is in a normal range, and <br />textures are clay loam and sandy clay loam (Table 6). <br />Physical and chemical properties of topsoil and spoil are similar at Colowyo. The pH of topsoil is 7.5 and the <br />spoil pH ranges from 7.7 to 7.8. Nitrate-nitrogen levels range from 19.1 to 24.1 mg/kg in the topsoil and 13.7 <br />to 18.1 mg/kg in the spoil. Ammonium-nitrogen levels in the spoil are similar or slightly higher in spoil (6.1 <br />to 8.7 mg/kg) compared to topsoil (4.6 to 6.0 mg/kg). Phosphorus levels vary greater in the spoil (7.8 to 29 <br />mg/kg) and less so in the topsoil (9.6 to 15 mg/kg). Potassium levels are substantially lower in spoil (95 to <br />105 mg/kg) compared to topsoil (191 to 210 mg/kg). Electrical conductivity, SAR, CEC, and texture are <br />similar between topsoil and spoil. The only chemical property that appears to be markedly different between <br />• topsoil and spoil at Colowyo is potassium.