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San Joaquin County, California 19
<br /> The shrink-swell potential is high in the subsoil. The textured. In some areas dense, weakly cemented
<br /> soils are subject to rare flooding. sediments are at a depth of 40 to 60 inches.
<br /> Minor in this unit are the Alamo, Chuloak, Exeter, Minor in this unit are the Exeter and Kingdon soils.
<br /> and Manteca soils. Alamo soils are poorly drained and Exeter soils are moderately well drained and are in the
<br /> are in dissected drainageways. Chuloak soils are very same landscape position as the San Joaquin soils.
<br /> deep and are on alluvial fans on the highest parts of the Kingdon soils are very deep and moderately well
<br /> landscape. Exeter and Manteca soils are moderately drained and are on the slightly higher fan terraces.
<br /> well drained and are on the slightly higher terraces. Areas of this unit are used mainly for livestock
<br /> Areas of this unit are used mainly for livestock grazing, irrigated crops, or pasture. A few areas are
<br /> grazing, irrigated crops, or pasture. A few areas are used for homesite development. The major soils are
<br /> used for homesite development. The Madera soils are suited to the vegetation used for livestock grazing. Few
<br /> suited to the vegetation used for livestock grazing. Few limitations affect this use. The soils generally are suited
<br /> limitations affect this use. The soils generally are suited to irrigated crops and pasture, but the San Joaquin soils
<br /> to irrigated crops and pasture, but they are poorly are poorly suited to deep-rooted crops. Limitations
<br /> suited to deep-rooted crops. Limitations include depth to include depth to the very slowly permeable claypan,
<br /> the very slowly permeable claypan, depth to the depth to the hardpan, and a low or very low available
<br /> hardpan, and a low available water capacity. water capacity in areas of the San Joaquin soils and
<br /> Where this unit is used for homesite development, slow permeability in the hard substratum in some areas
<br /> the main limitations are depth to the very slowly of the Bruella soils.
<br /> permeable claypan, depth to the hardpan, a high shrink- Where this unit is used for homesite development,
<br /> swell potential, and low strength in the subsoil. The the main limitations are depth to the very slowly
<br /> main hazard is rare flooding. Onsite sewage disposal is permeable claypan, depth to the hardpan, the high
<br /> difficult because of the very slow permeability and the shrink-swell potential, and low strength in the subsoil in
<br /> hardpan. Structural damage can result from the high areas of the San Joaquin soils and moderately slow or
<br /> shrink-swell potential and low strength. These slow permeability in areas of the Bruella soils. Onsite
<br /> limitations should be considered when foundations, sewage disposal is difficult on the San Joaquin soils
<br /> buildings, and roads are designed. Dikes and channels because of the very slow permeability and the hardpan.
<br /> that have outlets for floodwater can protect buildings Structural damage can result from the high shrink-swell
<br /> from flooding. potential and low strength. These limitations should be
<br /> considered when foundations, buildings, and roads are
<br /> 14. San Joaquin-Bruella designed.
<br /> Moderately well drained and well drained, moderately Nearly Level to Steep Soils on Dissected Terraces,
<br /> coarse textured and medium textured soils that are Fan Terraces, High Terraces, and Hills
<br /> moderately deep to a cemented hardpan or are very The soils in this group are primarily in the eastern
<br /> deep; on low terraces part of the county. A few small areas are at the base of
<br /> This map unit is on low terraces in the northern part the Coast Range in the southwestern part of the county.
<br /> of the county. The soils formed in old alluvium derived Some of the soils are on the highest terraces in the
<br /> from granitic rock sources. county. Elevation ranges from about 80 feet to about
<br /> This unit makes up about 4 percent of the survey 500 feet. The average annual precipitation is 9 to 17
<br /> area. It is about 72 percent San Joaquin and similar inches, and the average annual air temperature is 60 to
<br /> soils, 21 percent Bruella and similar soils, and 7 percent 61 degrees F. The average frost-free period is 250 to
<br /> components of minor extent. The major components do 275 days.
<br /> not occur together in all of the delineations. These soils are shallow, moderately deep, or deep to
<br /> San Joaquin soils are 20 to 40 inches deep to a a cemented hardpan or are shallow or very deep. They
<br /> :j'd cemented hardpan and are moderately well drained. are moderately well drained and well drained. The
<br /> Slope ranges from 0 to 8 percent. Typically, the surface surface layer is moderately coarse textured, moderately
<br /> layer is medium textured. The subsoil is a fine textured fine textured, or gravelly and medium textured. Most of
<br /> claypan in the upper part and a hardpan in the lower the soils have a restrictive layer, such as a fine textured
<br /> part. The shrink-swell potential is high in the subsoil. subsoil, claypan, or hardpan or weakly cemented
<br /> Bruella soils are very deep and are well drained or sediments, or are shallow to bedrock.
<br /> moderately well drained. Slope ranges from 0 to 2 These soils are used mainly for livestock grazing or
<br /> ;i is Percent. Typically, the surface layer is moderately wildlife habitat. A few areas are used for homesite
<br /> coarse textured, and the subsoil is moderately fine development, dryland grain crops, or irrigated pasture.
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