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Sampling Design <br />Before fieldwork commenced, the permit document, amendments to the permit, baseline <br />data, any prior sampling data, applicable maps, and aerial photographs were reviewed to <br />evaluate topography, reclamation timing, seed mixes, revegetation methods, and <br />applicable revegetation standards. <br />A 1:2400 scale (1" = 200') map of the reclaimed mine site was used to delineate the <br />sampling area within the former permit area. Computer generated random numbers were <br />used to establish a pool of x,y coordinates for a Cartesian grid that was overlain upon the <br />reclaimed area. From these points sample sites were randomly established. Thirty <br />random sample locations were initially established for the reclaimed area. Of these 30 <br />locations, 20 were utilized to ensure representative sampling over the entire reclaimed <br />area. Sample sites were located in the field through pacing from known landmarks <br />depicted on aerial photographs. <br />Field Sampling <br />Vegetation Cover and Species Composition <br />Vegetation cover was estimated by the use of the point-intercept method. A laser (ten) <br />point frame was used to minimize instrument error and maximize precision and observer <br />accuracy. Cover transects were 25 meters in length, with ten sample data points collected <br />at 5.0 meter intervals along the transect on both sides of the transect centerline, for a total <br />of 50 points per transect. Transect orientation was randomly determined by spinning a <br />pencil. Additionally, transects were established so there would be no overlap between <br />transects. In no event were transects allowed to extend within ten feet of revegetated area <br />boundaries, to minimize impacts from "edge effect" <br />For statistical purposes, each cover transect served as a sample unit. Data points recorded <br />the first vertical "hit" on vegetation (as determined by the laser point frame), soil (bare <br />ground), rock, or litter. The data were summarized by computing mean cover, relative <br />cover (percent of total vegetation cover attributed to each species), and species <br />composition. Species composition information was computed from vegetation cover data <br />using a ratio of individual species cover to total vegetation cover. <br />Production <br />Biomass production data were obtained using a harvest method. All of the current year's <br />growth included within aone-half square meter quadrat was clipped at both ends of each <br />transect. Succulents, noxious weeds, and cushion plants were not clipped. Clipped <br />biomass was placed in paper bags, and dried in Colorado State University's Rangeland <br />Ecosystem Science Laboratory forced air ovens for 24 hours at 105°C. Samples were <br />weighed on an appropriate scale to the nearest tenth of a gram and reported in g/mZ and <br />3 <br />