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<br />4.) Fondis-Weld Association: deep, nearly level and gently <br /> <br /> <br />sloping, loamy soils that have a clayey layer in the subsoil; formed <br /> <br /> <br />mainly in silty, wind-deposited material; on foothills. <br /> <br /> <br />This soil association occurs mainly in upland areas along the <br /> <br /> <br />western edge of the Basin from South Clarkson Street to South lJJliver-- <br /> <br /> <br />slty Boulevard. These soils take in water at a moderate rate witb a <br /> <br /> <br />moderate to high availahle \vater holding capacity. They generally <br /> <br /> <br />have a high shrink-swelling potenti.al. This soi 1 association is com- <br /> <br /> <br />posed mainly of Fondis Soils (silty loam to silty cluy loam 8" sllrlacc <br /> <br /> <br />] ayer, clay and silty clay loam su])soi I to about 32", underl a in by <br /> <br /> <br />loam, silt loam, and clay loam con-raining lime); Weld Soi Is ("ilt <br /> <br /> <br />loam 5" surface layer, clay loam, 5;ilty cl8Y and silty clny loam sub- <br /> <br /> <br />soil to ahout 21" with limy deposit:s 8t about 14" and other minor soils. <br /> <br /> <br />Since a general soil map showing soil associ 3tions was not avai]- <br /> <br /> <br />able for the Big Dry Creek Basin within Douglas County, the soils had <br /> <br /> <br />to he evaluated b3scd on soils groupings by phases. Most of the upper <br /> <br /> <br />reaches of the drainage basin arc composed of soils phnses with the <br /> <br /> <br />following general properties as shown in the following Tahle ]1-1. <br /> <br />-/0. <br />