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FV- Xerofluvents, 0 to 2 percent slopes, frequently flooded. These very deep excessively to well drained <br /> soils are on nearly level flood plains and inter-channel bars in river channels. It formed in alluvium <br /> from mixed rock sources. Elevation is 40 to 240 feet. The average annual precipitation is about 16 <br /> inches, the average annual air temperature is about 60 degrees F, and the average frost-free period is <br /> about 270 days. <br /> The surface layer is brown sandy loam or gravelly sandy loaf about 14 inches thick. The underlying <br /> material to a depth of 60 inches is stratified pale brown sandy loam, loamy sand, fine sandy loam, silt <br /> loam and silty clay loam. In some areas the surface layer is loamy sand. <br /> Included in this unit are small areas of Columbia soils, Riverwash, Gravel pits and Dredge tailings on <br /> similar positions. Included areas make up about 15 percent of the total acreage. <br /> Permeability of the Xerofluvents soils are slow to rapid due to the variability of the substratum. <br /> Available water capacity is low to moderate. Runoff is slow and the hazard of water erosion is slight. <br /> This soil is subject to frequent, long periods of flooding in December through June. Channeling and <br /> deposition are common along streambanks. <br /> This unit is used for wildlife habitat. <br /> This map unit is in capability subclass VIIw (MLRA-17), nonirrigated. This map unit is vegetative soil <br /> group J. <br /> SAN JOAQUIN COUNTY SOIL SURVEY PRELIMINARY DRAFT 7/90 SUBJECT TO CHANGE <br />