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Soil consisted of 8 soil map units with a total of 10 soil types. Soil ranged from deep to shallow with <br />underlying bedrock being soft to hard. Deeper soils formed in aeolian deposits and underlying <br />residuum. Moderately deep to shallow soils formed in residual parent material. Barx soil is <br />predominantly in hayland or irrigated pastures. Bowbac, Bowdish and Darvey soils are <br />predominantly irrigated pasture with some haylands. Begay, Monierco, Valleycity, and Wahweap <br />soil are shallow and are predominantly support sagebrush types and some low productivity irrigated <br />pasture. See Section 2.04.9, "Soil Resource Information," for a detailed soils discussion. <br />Climate. The Nucla area is characterized by interior continental weather patterns resulting in a <br />semiarid climate. Precipitation is scattered throughout the year, though the highest amounts are <br />received during the summer months. Snowfall does not normally contribute significantly to the <br />yearly totals received. For the years 1961 through 1975, the Uravan Station recorded average <br />annual precipitation of 12.24 inches. Average annual precipitation at Uravan for the year 1978 <br />through 1986 was 14.38 inches, indicating a wetter precipitation cycle at this time. Table 2.04.10-1 <br />details the precipitation received at the Uravan Station, located 13 miles northwest of Nucla, forthe <br />months January through October in 1987 and January through April 1999. <br />Temperatures in the Nucla area are generally moderate throughout the year, though summers can <br />• be hot. The average annual mean temperature for the Uravan Station is 48°F. Table 2.04.10-2 <br />presents temperature data from the Uravan Station for the months January through October in 1987 <br />and January through April 1999. May through August 1999 showed much higher rainfall than <br />average with most stations in western Colorado reporting precipitation more than 178% of normal. <br />The semiarid climate, with sunny days predominating and low relative humidities, results in high <br />evapotranspiration rates. The frost free period is approximately 150 days. Further information on <br />climate may be found in Section 2.04.8, Climatological Information. <br />• (REVISED 9/99) 2,04.10 - 4 <br />