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• operator due to stand failure within the field trial areas will not reinitiate the bond liability <br />period. <br />4.15.7 Determinine Reveeetation Success: General Requirements and Standards <br />During the summer of 1980, two reference areas were selected to represent the two major <br />vegetative communities to be disturbed, sagebrush and mountain shrub. The location of the <br />reference areas are shown on the Vegetation map (Map 4) and Regional Vegetation map <br />(Map 3). Extensive, detailed vegetative sampling was performed, duplicating the <br />methodologies as described in Section 2.04.10. <br />The reference areas were sampled for herbaceous cover, herbaceous productivity and woody <br />plant density. Species diversity was determined utilizing herbaceous cover data from the <br />premining inventory of the sagebrush and mountain shrub communities. The reference areas <br />are approximately seven acres in size. <br />Statistical tests were performed on the vegetative data from the reference areas to prove that <br />they were comparable to the premined area. The parameters compared were herbaceous cover <br />and herbaceous production. <br />Sample size adequacy tests were performed on both the premine and reference area data to <br />insure that representative cover and production data had been obtained at the 80% level of <br />confidence. <br />• Where necessary, the mean, variance and number of observations for the premine and <br />reference area data were used to perform t-tests on the cover and production data to insure <br />that there were no significant difference, at the 90% level of- confidence, between the sets of <br />cover data and production data. <br />A copy of the transect data summaries for cover, production and woody plant density can be <br />found in Exhibit 10, Vegetation Information. <br />As shown on Table 1, Herbaceous Cover of the Mountain Shrub Type -Premine and <br />Reference Area; Table 2, Herbaceous Production of the Mountain Shrub Type -Premine and <br />Reference Area; Table 3, Herbaceous Cover of the Sagebrush Type -Premine and Reference <br />Area; and Table 4, Herbaceous Production of the Sagebrush Type -Premine and Reference <br />Area, the reference area is statistically comparable to the premine areas for the parameters of <br />cover and production. <br />During the summer of 1980, when the reference areas were chosen, the final mine plan had <br />not been completed and, the sagebrush reference area was inadvertently located within the <br />area to be mined. <br /> <br />4.15-9 Revision Date: 12/12/05 <br />Revision No.: MR-77 <br />