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Revised March 18, 1992 <br />seedlings from the Plant Materials Center are being evaluated for <br />potential use in mined land revegetation. The Center has not <br />published a final report to date. <br />4.15.7 Determining Revegetation Success: General Requirements <br />and Standards <br />During the summer of 1980, two reference areas were selected to <br />represent the two major vegetative communities to be disturbed, <br />sagebrush and mountain shrub. The location of the reference areas <br />are shown on the Vegetation map (Map 4) and Regional Vegetation map <br />(Map 3). Extensive, detailed vegetative sampling was performed, <br />duplicating the methodologies as described in Section 2.04.10. <br />The reference areas were sampled for herbaceous cover, herbaceous <br />productivity and woody plant density. Species diversity was <br />determined utilizing herbaceous cover data from the premining <br />inventory of the sagebrush and mountain shrub communities. The <br />reference areas are approximately seven acres in size. <br />Statistical tests were performed on the vegetative data from the <br />reference areas to prove that they were comparable to the premined <br />area. The parameters compared were herbaceous cover and herbaceous <br />production. <br />Sample size adequacy tests were performed on both the premine and <br />reference area data to insure that representative cover and <br />• production data had been obtained at the 80$ level of confidence. <br />where necessary, the mean, variance and number of observations for <br />the premine and reference area data were used to perform t-tests on <br />the cover and production data to insure that there were no <br />significant difference, at the 90$ level of confidence, between the <br />sets of cover data and production data. <br />A copy of the transect data summaries for cover, production and <br />woody plant density can be found in Exhibit 10, Vegetation <br />Information. <br />As shown on Table 1, Herbaceous Cover of the Mountain Shrub Type - <br />Premine and Reference Area; Table 2, Herbaceous Production of the <br />Mountain Shrub Type - Premine and Reference Area; Table 3, <br />Herbaceous Cover of the Sagebrush Type - Premine and Reference <br />Area; and Table 4, Herbaceous Production of the Sagebrush Type - <br />Premine and Reference Area, the reference area is statistically <br />comparable to the premine areas for the parameters of cover and <br />production. <br />During the summer of 1980, when the reference areas were chosen, <br />the final mine plan had not been completed and, the sagebrush <br />reference area was inadvertently located within the area to be <br />mined. <br /> <br />4.15-4 <br />