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New Horizon Mine 1 <br /> 1. Cover - Reclaimed areas will be compared to the established reference area <br /> or a technical standard of 43.9 percent ground cover (vegetation and litter) <br /> depending on whether the area has been previously mined or not. <br /> 2. Production - Reclaimed areas will be compared to Soil Conservation Service <br /> potential productivity values (technical standards) for Shavano (500 lbs./ac.) <br /> or Persayo (250 lbs./ac.) soil series depending on end land use. <br /> 3. Species diversity - Reclaimed areas will achieve a standard of three grasses, <br /> one forb and one shrub with relative cover values greater than three percent. <br /> The combined relative importance will not exceed 85 percent and no one <br /> species will contribute greater than 40 percent relative importance. <br /> 4. Seasonal variety requirements will be waived since the proposed species will <br /> support the proposed post-mining land use. <br /> 5. Woody plant density - The live stem success standard will be 250 stems per <br /> acre on dry sites and 750 stems per acre on wet sites with at least one shrub <br /> having a minimum relative cover value of three percent. <br /> New Horizon Mine 2 <br /> 1. Cover - The success standard for irrigated pasture is based on baseline <br /> surveys which indicated a total ground cover of 94.5 percent (live vegetation <br /> cover of about 72 percent and litter cover of about 23 percent). The success <br /> standard for dryland pasture is based on a cover comparison with the <br /> established reference area for New Horizon. A cover success standard for <br /> irrigated hayland is not applicable because revegetation success is only <br /> dependent on production. <br /> 2. Production - Grass hayland area (this includes the prime farmland area) <br /> success standards will be based on three year records (1987-1989) of other <br /> hayland directly west of the proposed permit area. The first year of record <br /> (1987) indicates a production of about 6.0 tons per acre per year. The <br /> success standard for irrigated pasture areas is based on Soil Conservation <br /> Service Soil Interpretation Records (SCS Form 5's) for the Progresso Soil <br /> Series. This technical standard will be 4.0 tons per acre per year. The <br /> success standard for dryland pasture areas will be based on SCS Form 5's for <br /> the Travesilla and Pinon soil series. The weighted average potential <br /> production for the Travesilla- Pinon complex is 625 pounds per acre per <br /> year. <br /> 3. The success standard requirements for species diversity, seasonal variety, and <br /> woody plant density on all three proposed end land use types will be waived <br /> since post-mining land uses will be pasture and hayland. <br /> 20 <br /> II <br />