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• As an aid to the reviewer, Table 10-1 summarizes, by parameter, the year, location, and <br /> firm involved in collecting data used in this tab in order to present an overall summary <br /> of the nature of the vegetation communities at Seneca II-W and the associated haul road. <br /> <br />Vegetation Mapping and Type Acreages <br />Vegetation Maps. A vegetation map was prepared in 1974 at a scale of 1:24,000 and <br />enlarged to 1:4,800 (1 inch = 400 feet). This map included an area larger than the <br />current permit boundary. The vegetation map for the current permit area (Exhibit 10-1) is <br />the result of the original (1974) mapping plus corrections from field checks during 1979 <br />and 1983. The 1990 permit expansion area was mapped in 1990 using stereo false color <br />infrared aerial photos at a scale of 1:24,000. Black and white stereo photography at a <br />scale of 1:24,000 was also used for the 1990 mapping. Field ground truthing was used to <br />verify the mapping. The vegetation map for the haul road (Exhibit 10-2) was developed <br />from interpretation of 1:12,000 scale black-and-white aerial photography and field checks. <br />After field checking, vegetation community types were transferred to 1 inch = 400 feet <br />base maps. All sampling points were transferred from the field maps to the final <br />vegetation maps (Exhibits 10-1 and 10-2). The 1990 mapping is included on Exhibit 10-1. <br />Map Description and Acres. As shown on Exhibits 10-1 and 10-2, the area included in the <br />Seneca II-W Mine (including the current permit area and 1990 expansion areas) and <br />tie-across haul road corridor is covered by several vegetation types that reflect the <br />varied topography, aspect, exposure pattern of various geologic strata, soils, and <br />agricultural or management activities. Thirteen distinguishable vegetation types have <br />been mapped: (A) aspen woodland, (B) mixed brush, (S) sagebrush (WW) Western <br />wheatgras s/alkali sagebrush, (MD) mesic drainage, (SMB) steep mixed brush, (SL) low <br />sagebrush, (SB) mountain big sagebrush, (DM) disturbed meadow, (RD) disturbed riparian, <br />(W) wheat, (M) meadow, and (C) greasewood. The first six occur on the current mine permit <br />and 1990 expansion areas, while the remaining seven are scattered along the haul road <br />corridor. Data is presented in Table 10-2 for the relative areal extent of these <br /> vegetation types in the mine and haul road corridor. Anticipated disturbance acres for <br /> the mine area vegetation communitie s and tie-acros s haul road corridor vegetation <br /> communities are shown on Table 10-3. When evaluating disturbance acreages for the haul <br />• road corridor, it was assumed that the affected area to be reclaimed reflected the maximum <br /> disturbance as of September 1, 1990. <br />5 <br />