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4-94 <br />• The first hit along a vertical line was recorded as vegetation <br />(by species), rock, litter, or soil. Veget! ion intercepted below <br />tree and shrub first hits was recorded as a second or third hit. <br />---- -' _.-.. W <br />Only first hits were used in calculating percent cover. <br />Sample adequacy requirements for affected area cover data were <br />calculated using the OSM formula <br />s2+2 <br />~nin = <br />(dx) 2 <br />where nmin = the minimum adequate number of cover transects <br />s2 = sample variance <br />+2 = a designated +-statistic (0.84 for a one-tailed <br />test with 80~ confidence) <br />• d = desired limits of detection (0.1 or 10~) <br />x = sample mean. <br />4.8.6.2 Collection and Analysis of Shrub and Tree Data <br />Shrub heights and densities and tree heights, densities, and <br />diameters at breast height (DBH) were measured at each cover <br />transect location. In some vegetation types additional sample <br />sites were randomly located to meet sample adequacy requirements. <br />The crown height of the first two individuals of each shrub <br />species with a canopy overlapping the transect line was measured <br />to the nearest centimeter. Likewise the height and DBH of the <br />first two individuals of each tree species with canopies over- <br />lapping the transect line were measured. DBH's were recorded <br />to the nearest centimeter and heights were estimated to the <br />