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San Joaquin County, California 13 rMderately coarse textured. A high water table is at a Drainage has been improved in areas near the lower depth of 4 to 6 feet and is regulated by pumps. The reaches of Dry Creek and the Mokelumne River. soils are subject to rare or occasional flooding. This unit makes up about 1 percent of the survey Grangeville soils are somewhat poorly drained. SI pe area. It is about 38 percent Columbia and similar soils, ranges from 0 to 2 percent. Typically, the surface I er 22 percent Vina and similar soils, 21 percent is moderately coarse textured. The underlying ma rial Coyotecreek and similar soils, and 19 percent is stratified and is coarse textured to medium to red. components of minor extent. The major components do A high water table is at a depth of 4 to 6 feet a d is not occur together in all of the delineations. regulated by pumps. The soils are subject to r re Columbia soils are somewhat poorly drained. A flooding. drainage system has lowered the apparent water table Columbia soils are somewhat poorly drai ed. Slope to a depth of 3 to 5 feet or more. Slope ranges from 0 ranges from 0 to 2 percent. Typically, the urface layer to 2 percent. Typically, the surface layer is moderately is moderately coarse textured. The under ing material coarse textured. The underlying material is stratified is stratified and is coarse textured to m ium textured. and is coarse textured to medium textured. The soils A high water table is at a depth of 3 to 5 feet, or are subject to rare or occasional flooding. drainage measures have lowered the apparent water Vina soils are well drained. Slope ranges from 0 to 2 table to a depth of 5 feet or more. T e soils are rarely percent. Typically, the surface layer is moderately flooded to frequently flooded. coarse textured. The underlying material is medium Minor in this unit are the Dello Egbert, and Ryde textured. The soils are subject to rare flooding. soils. Dello soils are very poorly drained, are coarse Coyotecreek soils are well drained. Slope ranges textured, and are in the same ndscape position as the from 0 to 2 percent. Typically, the surface layer is major soils. Egbert soils are oderately fine textured medium textured. The underlying material is medium and fine textured throughou . Ryde soils are very poorly textured and moderately fine textured. The soils are drained and have a high o anic matter content. The subject to occasional flooding. ert and Ryde soils ar slightly lower on the Minor in this unit are Xerofluvents; Cosumnes, Ascape than the surr unding major soils. Guard, and Merritt soils; and areas of Dumps, tailings, Areas of this unit ar used mainly as irrigated and Pits, gravel. Cosumnes soils are moderately fine cropland or for home ite development. The major soils textured in the upper part and fine textured in the lower are suited to irrigated crops. Limitations include depth to part. Guard and Merritt soils are poorly drained. the high water tabll� in most areas. The main hazard is Xerofluvents are frequently flooded. All of these soils occasional or frequent flooding in areas that are not are in the lower landscape positions, downstream from protected by lev4s. In some areas the underlying the major soils. Dumps are smoothed or uneven layers in the C lumbia soils are slowly permeable. The accumulations of tailings. Without major reclamation, growth of mo, t perennial, deep-rooted crops is limited they cannot support plants. Pits are open excavations by the high )kater table. from which soil has been removed and in which other Where tis unit is used for homesite development, material that supports few or no plants has been the main mitation is depth to the high water table. The exposed. main ha and is rare, occasional, or frequent flooding in Areas of this unit are used mainly as irrigated someeas. Onsite sewage disposal is difficult because cropland. A few areas are used for homesite of th high water table and may cause contamination of development or wildlife habitat. The major soils are the ground water. Dikes and channels that have outlets suited to irrigated crops. Limitations include depth to the for/floodwater can protect buildings from flooding. high water table in some areas. The main hazard is occasional flooding in areas that are not protected by 4. Columbia-Vina-Coyotecreek levees. The growth of most perennial, deep-rooted crops is limited by the high water table. Somewhat poorly drained and well drained, moderately Where this unit is used for homesite development, coarse textured and medium textured soils that are very the main limitation is depth to the water table in some deep and are subject to flooding or protected by levees; areas. The main hazard is rare or occasional flooding. on flood plains Onsite sewage disposal is difficult in some areas This map unit is on high flood plains, primarily because of the high water table and may cause :ent to the Mokelumne River, Dry Creek, and the contamination of the ground water. Dikes and channels L-eraveras River. The soils formed in alluvium derived that have outlets for floodwater can protect buildings from mixed rock sources. The construction of levees from flooding. has reduced the hazard of flooding in some areas.