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response of individual pairs of falcons to disturbance near the eyrie varies <br />with topography at the site and the temperament of the individual birds. It <br />• is generally accepted that a buffer zone should be one-half mile wide around <br />an active eyrie. <br />Mining activity on Occidental land began on 1 June, 1972. Sitings of pere- <br />Brine falcons were made in 1974. The Bureau of Land Management, in two <br />Environmental Analysis Records pertaining to permits on Occidental's Logan <br />Wash Oil Shale Site, have noted that human activity has not driven the <br />falcons away. <br />Occidental's Environmental staff plans to use binoculars and a 45-power <br />spotting telescope in an effort to locate any primary or alternate peregrine <br />falcon eyries. Further plans to make continued seasonal observations which <br />might help prevent serious disturbance of a breeding pair are being formulated. <br /> <br />Surface Hydrology <br />A soil sample was collected in the Dry Gulch drainage area near the E~ corner <br />Section 24, T7S, R97W, The location is shown on Figure 1. The weight analysis <br />was as follows: <br />Sand 49.7°U <br />Silt 31.90 <br />Clay 17.4% <br />Classification: Loam <br />This material is typical of the slopes in Dry Gulch in Section 24 to within <br />approximately 1,000 feet of the line between Sections 24 and 25. <br />South of this point the soil changes noticeably as the slopes become steeper. <br />• The soil is very shallow and rocky. Essentially no A zone exists. These <br />~ steep rocky slopes comprise the upper part of the drainage area in Section 25 <br />down to the Mahogany Ledge which is a sheer rock face about 100 feet high. <br />-9- <br />