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4-91 <br />• 4.8.2 Vegetation Mapping Studies <br />A plant ecologist conducted a reconnaissance of the entire <br />project site and selected mapping units based upon vegetation <br />structure and species dominance. Color and black and white <br />photography was used to precisely delineate the boundaries of <br />each vegetation type upon a USGS base map at a scale of 1" _ <br />4~_ Extensive field reconnaissance was again employed to <br />verify the boundaries of the mapping units. This phase of the <br />study was completed in 1977. During 1980, the preciseness of <br />each vegetation mapping unit was again verified through field <br />observation. <br />4.8.3 Affected Area Sampling Design <br />• Cover,~production; and density Sampling was confined to an <br />area surrounding existing and proposed disturbances. See <br />Figure 4.8-1. All sample sites were located by a random pro- <br />cess. A grid system was constructed over a vegetation map of <br />the area surrounding existing and proposed disturbances. Coordi- <br />nates (x,y) were determined by a random number generator and <br />used to locate a set number of sample points within each sample <br />unit. Thus, the required number of sample points was generated. <br />Each sample point was located in the field through the aid of <br />a compass, USGS map, and pacing where necessary. Range cages <br />were not used as there was no potential for domestic livestock <br />• grazing. <br />