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CP 1 of 2 <br /> CP - Capay clay, 0 to 2 percent slopes . This very deep , moderately <br /> well drained soil is on nearly level interfan basins . It formed in <br /> alluvium from mixed rock sources . Elevation is 30 "to 200 feet . The <br /> average annual precipitation is about 10 inches , the average annual air <br /> temperature is about 60 degrees F, and the average frost-free period is <br /> about 270 days . <br /> Typically, the surface layer is grayish brown and dark grayish brown <br /> clay about 20 inches thick . The upper 14 inches of the underlying <br /> material is variegated grayish brown and dark grayish brown clay. The <br /> lower part to a depth of 60 inches is dark brown and pale brown clay . <br /> It is calcareous between the depths of 20 and 60 inches . In some <br /> areas the surface layer is silty clay. <br /> Included in this unit are small areas of Stomar , Vernalis and Willows <br /> soils. Also included are small areas of a soil similar to Capay clay <br /> with a high water table at 48 inches and saline-sodic conditions . <br /> Included areas make up about 15 percent of the total acreage . <br /> Permeability of this Capay soil is slow. Available water capacity is <br /> high . Effective rooting depth is 60 inches or more . Runoff is slow, <br /> and the hazard of water erosion is slight . <br /> Most areas of this unit are used for irrigated cropland and orchards . <br /> A few areas are used for urban development . <br />