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~ ~ Y <br />3. Species diversity - Reclaimed areas will achieve a standard of <br />three grasses, one forb and one shrub with relative cover values <br />greater than three percent. The combined relative importance <br />will not exceed 85 percent and no one species will contribute <br />greater than 40 percent relative importance. <br />4. Seasonal variety requirements will be waived since the proposed <br />species will support the proposed post-mining land use. <br />5. Woody plant density - The live stem success standard will be <br />250 stems per acre on dry sites and 750 stems per acre on wet <br />sites with at least one shrub having a minimum relative cover <br />value of three percent. <br />New Horizon Mine 2 <br />Cover - The success standard for irrigated pasture is based on <br />baseline surveys which indicated a total ground cover of <br />94.5 percent (live vegetation cover of about 72 percent and <br />litter cover of about 23 percent). The success standard for <br />dryland pasture is based on a cover comparison with the <br />established reference area for New Horizon. A cover success <br />standard for irrigated hayland is not applicable because <br />revegetation success is only dependent on production. <br />2. Production - Grass hayland area (this includes the prime farmland <br />area) success standards will be based on three year records <br />C1987-1989) of other hayland directly west of the proposed permit <br />area. The first year of record (1987) indicates a production of <br />about 6.0 tons per acre per year. The success standard for <br />irrigated pasture areas is based on Soil Conservation Service <br />Soil Interpretation Records (SCS Form 5's) for the Progresso Soil <br />Series. This technical standard will be 4.0 tons per acre per <br />year. The success standard for dryland pasture areas will be <br />based on SCS Form 5's for the Travesilla and Pinon soil series. <br />The weighted average potential production for the Travesilla- <br />Pinon complex is 625 pounds per acre per year. <br />3. The success standard requirements for species diversity, seasonal <br />variety, and woody plant density on all three proposed end land <br />use types will be waived since post-mining land uses will be <br />pasture and hayland. <br />The Division proposes to approve these standards. <br />E. The Division has already approved of the reference area used for the <br />New Horizon 1 area which the applicant has selected based on the <br />requirements of Rule 4.15.7(3). <br />F. The reference areas will be utilized to determine revegetation <br />success in a manner which the Division finds acceptable 4.15.7(4). <br />_21_ <br />