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The soils in the Grand Valley area were classified by the Soil <br /> Conservation Service in cooperation with the Colorado Agricultural Experi- <br /> ment Station in 1940. The results of that study in the Fruita area are <br /> shown in Figure I-4. The soil classification symbols, along with a general <br /> description of each symbol , are tabulated in Table I-1 <br /> The soils in the Fruita area are generally classified by the Soil <br /> Conservation Service as silty clay loams to sandy clay loams. The soils <br /> have developed by weathering and wind and water deposition. The parent <br /> material is usually the Mancos Shale which is a lake deposit of the <br /> Cretaceous age. These soils are generally poorly drained and are affected <br /> by local irrigation practices and surface drainage. The soils normally <br /> stand well and would not present any unusual construction problems , except <br /> where there is a high water table. Permeability rates are normally slow, <br /> and that factor, together with high water tables, has caused problems with <br /> several septic systems. <br /> The classification of soils within the Colorado National Monument, <br /> the Glade Park area, and Pinon Mesa have not been prevented within this <br /> report because construction in these areas is not anticipated by the pro- <br /> posed plan. <br /> I-3 <br />