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Table 2. 2004 Mine Bench Outslope Seed Mixture <br /> Species Scientific Name Variety # PLS/Acre <br /> Kentucky Bluegrass Poa pratensis Banff 1.25 <br /> Elymus <br /> Slender Wheat grass trachycaulus San Luis 4.00 <br /> Mountain Brome Bromus marginatus Bromar 4.50 <br /> Sheep Fescue Festuca ovina Covar 3.00 <br /> Hard Fescue Festuca ovina Durar 3.15 <br /> Red Fescue Festuca rubra Pennlawn 2.50 <br /> Timothy Phleum pratense Climax 1.25 <br /> Tufted Deschampsia <br /> Hairgrass caespitosa Peru Creek 0.75 <br /> Sterile Triticale <br /> Hybrid N/A ------- 8.00 <br /> Orchardgrass Dactylis glomerata Latar 1.00 <br /> White Dutch Clover Trifolium repens Ladino 0.50 <br /> Cicer Milkvetch Astragalus cicer Monarch 1.50 <br /> Blue Flax Linum lewsii Ap ar 1.00 <br /> Yarrow Achillea millifolium VNS 0.10 <br /> Woods Rose Rosa woodsii VNS 0.50 <br /> TOTAL 33#/Ac. PLS <br /> The most economic way to deliver the specified volumes of seed, fertilizer, mulch and <br /> tackifier to the outslopes was to use a helicopter. A slow release fertilizer, Biosol Mix (7- <br /> 2-3) was delivered to the outslopes at a rate of 1,200 pounds per acre by helicopter. The <br /> seed, mulch and fertilizer were usually seeded from the air. However, extremely windy <br /> conditions periodically occurred during the project, negatively impacting seed delivery to <br /> some areas. To compensate for this, the outslopes at Mines 3 and 5 were hand seeded. <br /> Following seed and fertilizer application, the straw mulch and liquid tackifier were flown <br /> onto the slopes. Slender wheatgrass was selected as the mulch for the project. Slender <br /> wheatgrass was selected because it has been observed to establish well on the outslopes <br /> in the past. Therefore, it made economic and environmental sense to use a seed-bearing <br /> mulch of a species known to have value in Coal Basin. The mulch was applied to the <br /> outslopes at the rate of two tons per acre using the helicopter. Following mulch <br /> application, an organic liquid tackifier was applied from the air. The purpose of the <br /> tackifier was to anchor the mulch to the ground surface in an effort to resist removal or <br /> redistribution due to the high winds common to Coal Basin in the fall of the year. <br /> The final step in the construction process was to take steps to disrupt to the extent <br /> possible the concentrated flow of water draining from the overlying mine benches onto <br /> the outslopes. Two steps were taken to accomplish this; planting of trees and placement <br /> of straw wattles. <br /> 11 <br />