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where <br />• m = the minimum number of observations needed <br />t = at distribution value fora given confidence level (i.e., 1.28 at the 80% <br />confidence level) <br />s2 = the variance estimate for preliminary vegetation sampling <br />D = the level of accuracy desired for the estimate of the mean (i. e. 10%) <br />RESULTS <br />Description of Vegetation Types <br />Eight vegetation types were identified and two were sampled during the <br />course of the 1981 inventory. Table 1 indicates the types and acreages of <br />each within the permit area. The two vegetation types quantitatively sampled <br />were the pinon-juniper and mixed shrubs type. Four types have been disturbed <br />by mining activities at the OVM. Reference areas were selected for the pinon- <br />juniper and mixed shrubs types. It was concluded that the mixed shrubs refer- <br />ence area would suffice for the minimal disturbance in the oakbrush vegetation <br />Hype. Maps 6A and 68 indicate the distribution of the types within the permit <br />area. <br />Pinon-Juniper - The vegetation type where most of the surface facilities <br />of the OVM now occur is the pinon-juniper type. This type can be recognized <br />by the presence of pinon and juniper trees scattered throughout the landscape <br />in an open canopy fashion. Locally, Utah juniper dominated over pinon pine at <br />the mine site. Shrub species dominated the understory of which gambel oak, <br />Utah serviceberry, true mountain mahogany and bitterbrush were most prevalent. <br />~ very sparce weedy herbaceous understory was present within the type. More <br />prevalent species included cheatgrass, Richardson tansymustard and bedstraw. <br /> <br />-5- <br />