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of supplemental water provided by irrigation activities. See Section 2.04.9, "Soil Resources <br />Information," for a detailed soils discussion. <br />2.3 Soil - 1999 In 1998 a new Order I Soil Survey was conducted by Intermountain Resource <br />Inventories Inc. (IRI), Jim Irvine principal investigator. The survey covered lands and properties <br />outlined in the beginning of this chapter <br />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. Monierco, Valleycity, and Wahweap soil are <br />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 />2.4 Climate. The Nucla area is characterized by interior continental weather patterns resulting in <br />a 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, for the <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 <br />1987 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 />August 2013 (PR 08) 2.04.10 -4 <br />