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n <br />u <br />EXI3IBIT D - SOUS INFORMATION <br /> <br /> <br /> <br />The dominant soils mapping unit found on the C-SR-13A lease <br />tract is Unit 3, described as "rock outcrop and very shallow <br />soils of the canyons". It is the most extensive mapping <br />unit of the Dolores River Basin, constituting approximately <br />one-third of the area. <br />A typical landscape is characterized by the deep sandstone <br />canyons with steep slopes (from 25-10096) and long narrow <br />valleys. The dominant parent material for these soils is <br />sandstone with some shale and alluvium. <br />This mapping unit can be divided into three general components. <br />Rock outcrops account for about 45 percent of the unit. These <br />are largely of sandstone with some small shale outcrops. <br />About half of the unit (~r996) is in shallow (20 inches or less) <br />and stoney soils, generally with a light-colored, loamy surface <br />layer. Mixed alluvial soils of the Dolores and San Miguel <br />River bottoms account for about six percent of the mapping unit <br />The following 1966 Great Groups, Subgroups, or and types are <br />found in this mapping unit: <br />PERCENT OF <br />MAPPING UNIT- <br />GROUP <br />45 <br />25 <br />20 <br />4~ <br />2 <br /> <br />Rock outcrops <br />Haplustolls <br />Torriorthents <br />Lithic Argius~olls <br />Boralfs and Cryobarolls <br />Torrifluvents <br />In most. areas mapped as unit three the mean annual temperature' <br />falls between 42 degrees~F and 52 degrees F, with a frost free <br />period of between 100 and 160 days. Sheet erosion is described <br />as moderate. Sediment yield is estimated at less than 0.2 to <br />1.0 acre feet per square mile per year. <br />The dominant land use of mapping unit 3 is for range and wild- <br />life. Of the 974,000 acres it covers in the Dolores River <br />Basin, 3,800 acres are in irrigated cropland and there is no <br />dry cropland. <br />The dominant ground cover associated with mapping unit 3 is <br />pinyon-juniper. At higher elevations oakbrush, serviceberry, <br />and grass are more prevalent, while willows and cottonwoods <br />may be Sound along the narrow valleys. <br />(The preceeding paragraphs describe large categories of the <br />Dolores River Basin, into which the SR-13AProperty falls.) <br />