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Joaquin County, California 15 kton and similar soils, and 13 percent components soils formed in alluvium derived from m' rock inor extent. sources. Levees have been construct to control tcktone soils are in basins. They are 20 to 40 floodwater. They are used in conju on with drainage as deep to a cemented hardpan and are somewhat ditches and pumps to reduce we ss. ly drained. Slope ranges from 0 to 2 percent. This unit makes up about 4 cent of the survey tally, the surface layer is finb'textured. The subsoil area. It is about 43 percent rd and similar soils, 30 oderately fine textured. The shrink-swell potential is percent Devries and similar its, 18 percent Depth to the water table is more than 5 feet. The Rioblancho and similar so and 9 percent components are subject to rare flooding. of minor extent. ollenbeck soils are on basin rims. They are 40 to 60 Guard soils are ve ep and poorly drained. Slope as deep to a cemented hardpan and are moderately ranges from 0 to,2 p ent. Typically, the surface layer drained. Slope ranges from 0 to 2 percent. and underlying ma I are moderately fine textured. tally, the surface layer is fine textured. The subsoil The soils are cal eous throughout and have weakly ie textured and moderately fine textured. The cemented Jaye elow a depth of 15 inches. A high ik-swell potential is high. The soils are subject to water table is a depth of 1.5 to 3.0 feet in most flooding. areas, but - as been lowered to a depth of more than tockton soils are in basins. They are 40 to 60 5.0 feet in eas where water from drainage ditches is es deep to a cemented hardpan and are somewhat pumped o the adjacent sloughs and rivers. The soils rty drained. Slope ranges from 0 to 2 percent. are su to rare flooding. ically, the surface layer is fine textured. The subsoil D 'es soils are 20 to 40 inches deep to a cement ie textured and moderately fine textured. The ha and are somewhat poorly drained. Slope nk-swell potential is high. Depth to the water table is ges from 0 to 2 percent. Typically, the surface la r e than 5 feet. The soils are subject to rare flooding. and subsoil are moderately coarse textured_ Dept ftnor in this unit are the Archerdale soils and Urban the water table is more than 5 feet. The soils ar I. Archerdate soils are well drained and are on the subject to rare flooding, ier fan terraces. Urban land is covered by streets, Rioblancho soils are 20 to 40 inches deep a ting lots, buildings, and other structures. cemented hardpan and are somewhat poo drained. areas of this unit are used mainly as irrigated Slope ranges from 0 to 2 percent. Typi , the surface )land or pasture. A few areas are used for homesite layer is moderately fine textured. The s soil is elopment_ The major soils are suited to irrigated moderately fine textured and modera coarse )s and pasture. Limitations include slow permeability textured. Depth to the water table i ore than 6 feet. depth to the hardpan. In most areas the growth of The soils are subject to rare flo . annial, deep-rooted crops is limited by the hardpan. Minor in this unit are the Dell iIs and Urban land. Vhere this unit is used for homesite development, Dello soils are very poorly dr . ed and are in the lower main limitations are slow permeability, a high shrink- landscape positions. Urban d is covered by streets, SII potential, low strength, and depth to the hardpan. parking lots, buildings, Cher structures. main hazard is rare flooding. Onsite sewage Areas of this unit are mainly as irrigated oosal is difficult because of the slow permeability and cropland or pasture. A w areas are used for homesite hardpan. Structural damage can result from the high development. The in r soils are suited to irrigated :nk-swell potential and low strength. These crops and pasture. mitations include depth to the tations should be considered when foundations, hardpan in the D es and Rioblancho soils and a low dings, and roads are designed. Dikes and channels available water pacity in the Devries soils. Guard t have outlets for floodwater can protect buildings soils are limit y depth to the high water table, slow n flooding. permeability d weakly cemented layers. The growth of most per nial, deep-rooted crops is limited by the Guard-Devries-Rioblancho high wate ble or the hardpan. Wbe unit is used for homesite development, Orly drained and sorrnewltat poorly moderd6ely the - Gmitabons are depth to the high water table trse textured and moderately soils that and hardpan. The main hazard is rare flooding. moderately deep to a hardpan or are very O ' sewage disposal is difficult because of depth to rp and that have freer in most areas,on and the high water table and may cause :in rims -nation of the ground water_ Dikes and channels chis map unit is on b rims along the eastern at have outlets for floodwater can protect buildings le of the Sacrame n Joaquin Delta area. The om flooding.