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H-3 <br />sequently, the density and species diversity calculations were based on <br />the largest number of birds (by species) detected among the three <br />replications, rather than on the average number detected. This was <br />based on the assumption that songbird populations are frequently <br />underestimated, but never overestimated (LGL 1981). <br />Raptors <br />In March 1981, an aerial survey was Conducted to locate raptor nests on <br />bluffs and cliffs within the sodium lease tracts study area. All stick <br />nests that were probably used by raptors were mapped, and those in good <br />repair were later visited to verify use status. Raptor observations <br />were conducted on an opportunistic basis during the remainder of <br />1981. <br />In June 1984, a pedestrian survey was conducted to determine the <br />• presence of raptor nests, or usage of the proposed project area by <br />raptor species. Approximately 4 man-days were devoted to this on-site <br />survey. Addition•sl opportunistic sightings were made during approxi- <br />mately 10 man-days; in July. <br />Sage Grouse <br />Surveys for sage grouse leks were conducted in April 1981 on the sodium <br />lease area using ground and aerial methods. Ground surveys were <br />conducted for approximately 5 man-days in sagebrush habitat, primarily <br />during the early morning hours when breeding birds are most active. An <br />aerial survey was conducted during the early morning. Other opportun- <br />istic sightings of sage grouse were noted during the two year study. <br />In June 1984, a pedestrian survey was conducted to determine sage <br />grouse usage on the proposed project area. The survey was conducted at <br />this time due to the fact that the spring of 1983 and 1984 were very <br />• wet years and that insects and succulent vegetation could be found on <br />THIS DOCUMENT CONTAINS TRADE SECRETS AND PRIVILEGED, CONFIDENTIAL AN Di <br />PROPRIETARY COMINERCIA L, FINANCIAL, GEOLOGICAL AND GEOPHYSICAL DATA AN~oo~ ,~~~~ ~ .. '~ <br />INFORMATION. PU RSUANT TO LAW,THOSE PORTIONS MARKED"CONFIDENTIAL" ~Y <br />MAY N07 BE DISCLOSED, COPIED OR MADE AVAILABLE FOR PUBLIC INSPECTION. <br />