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SJ.BR 4/85 <br />.$IlOBR°Brentwood clay loam, 0 to 2 percent slopes. $T1This very deep, well <br />drained soil is on nearly level low alluvial fans. It formed in alluvium <br />derived dominantly from sedimentary rock sources. Elevation is 60 to 300 <br />feet. The average annual precipitation is about 10 inches, the average annual <br />air temperature is about 60 degrees F, and the average frost -free period is <br />about 270 days. <br />$IO1Typically, the surface layer is grayish brown clay loam about 10 inches <br />thick. The underlying material to a depth of 21 inches is brown clay loam. <br />The subsoil is pale brown clay loam about 27 inches thick. The substratum to a <br />depth of 60 inches or more is pale brown silty clay loam. It is calcareous <br />between the depths of 10 and 60 inches. In some areas the surface layer is <br />silty clay loam. <br />$IOlIncluded in this unit are small areas of Capay clay, Los Robles clay loam, <br />Rincon clay loam, and Vernalis clay loam. Also included are small areas of a <br />soil similar to Brentwood clay loam with gravelly or very gravelly clay loam <br />substratums. Included areas make up about 15 percent of the total acreage. <br />$IO1Permeability of this Brentwood soil is moderately slow. Available water <br />capacity is high. Effective rooting depth is 60 inches or more. Runoff is <br />slow, and the hazard of water erosion is slight. <br />$IO1Most areas of this unit are used for irrgated cropland and orchards. A <br />few areas are used for hcmesite development and dryland grain. <br />PRELIMINARY <br />SUBJLCT TO REVISION <br />