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<br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />000993 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />the irrigated adobe soil areas are located east of the <br />Uncompahgre River. These soils have a medium-fine textu~e <br />and a depth over the Mancos Formation varying from a few <br />feet to over 20 feet. Some nonarable areas contain excessive <br />amounts of salt. The topography of the adobe soil areas is <br />usually complex, with rolling to undulating slopes up to 5 <br />or 6 percent, although some areas are on slopes of less than <br />1 <br />5 percent and others have been leveled. <br /> <br />About aixty percent of the irrigated land in the Uncompahgre <br />Valley is on the stream terrace deposits or mesa soils. <br /> <br />These soils occur on small mesas east of Delta and on a <br /> <br />series of larger mesas west of the Uncompahgre River and ex- <br /> <br />tending essentially the entire length of the project area. <br />The mesa soils have a weak lime zone usually below 18 incbes <br />in depth, and are underlain by permeable gravels at varying <br />depths and thicknesses above the Mancos Formation which lies <br />from 10 to 30 feet below the surface. For the most part, <br />the mesa soils are medium textured, although fine textures <br />do occur. These soils are highly productive and intensively <br />farmed. The irrigated mesa soils have a low salt content <br /> <br />and salt loading from them is considered minimal. However, <br /> <br />water passing through the soils picks up various amounts of <br />1 <br />salt from the underlying Mancos Formation. <br /> <br />E-7 <br />