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pan Joaquin County, California 15 ;tockton and similar soils, and 13 percent components soils formed in alluvium derived from mi d rock ,f minor extent. sources. Levees have been construct to control Jacktone soils are in basins. They are 20 to 40 floodwater. They are used in conju ion with drainage fiches deep to a cemented hardpan and are somewhat ditches and pumps to reduce wet ss. poorly drained. Slope ranges from 0 to 2 percent. This unit makes up about 4 cent of the survey ypically, the surface layer is fine textured. The subsoil area. It is about 43 percent and and similar soils, 30 moderately fine textured. The shrink-swell potential is percent Devries and similar ils, 18 percent igh Depth to the water table is more than 5 feet. The Rioblancho and similar soi , and 9 percent components oils are subject to rare flooding. of minor extent. Hollenbeck soils are on basin rims. They are 40 to 60 Guard soils are very eep and poorly drained. Slope fiches deep to a cemented hardpan and are moderately ranges from 0 to 2 p ent. Typically, the surface layer cell drained. Slope ranges from 0 to 2 percent. and underlying ma ial are moderately fine textured. typically, the surface layer is fine textured. The subsoil The soils are cal eous throughout and have weakly is fine textured and moderately fine textured. The cemented layer elow a depth of 15 inches. A high shrink-swell potential is high. The soils are subject to water table is a depth of 1.5 to 3.0 feet in most rare flooding. areas, but i as been lowered to a depth of more than Stockton soils are in basins. They are 40 to 60 5.0 feet in reas where water from drainage ditches is inches deep to a cemented hardpan and are somewhat pumped ' to the adjacent sloughs and rivers. The soils poorly drained. Slope ranges from 0 to 2 percent. are su ct to rare flooding. Typically, the surface layer is fine textured. The subsoil D ries soils are 20 to 40 inches deep to a cementad- Is fine textured and moderately fine textured. The ha an and are somewhat poorly drained. Slope Shrink-swell potential is high. Depth to the water table is r ges from 0 to 2 percent. Typically, the surface la r more than 5 feet. The soils are subject to rare flooding. and subsoil are moderately coarse textured. Dept Minor in this unit are the Archerdale soils and Urban the water table is more than 5 feet. The soils ar ind. Archerdale soils are well drained and are on the subject to rare flooding. higher fan terraces. Urban land is covered by streets, Rioblancho soils are 20 to 40 inches deep a parking lots, buildings, and other structures. cemented hardpan and are somewhat poor drained. Areas of this unit are used mainly as irrigated Slope ranges from 0 to 2 percent. Typica , the surface Cropland or pasture. A few areas are used for homesite layer is moderately fine textured. The s soil is development. The major soils are suited to irrigated moderately fine textured and modera coarse crops and pasture. Limitations include slow permeability textured. Depth to the water table i ore than 6 feet. and depth to the hardpan. In most areas the growth of The soils are subject to rare floo " g. perennial, deep-rooted crops is limited by the hardpan. Minor in this unit are the Dell soils and Urban land. Where this unit is used for homesite development, Dello soils are very poorly dr ed and are in the lower the main limitations are slow permeability, a high shrink- landscape positions. Urban d is covered by streets, swell potential, low strength, and depth to the hardpan. parking lots, buildings, an ther structures. -fhe main hazard is rare flooding. Onsite sewage Areas of this unit are ed mainly as irrigated disposal is difficult because of the slow permeability and cropland or pasture. A w areas are used for homesite the hardpan. Structural damage can result from the high development. The m r soils are suited to irrigated shrink-swell potential and low strength. These crops and pasture. mitations include depth to the limitations should be considered when foundations, hardpan in the D ries and Rioblancho soils and a low (puildings, and roads are designed. Dikes and channels available water pacity in the Devries soils. Guard That have outlets for floodwater can protect buildings soils are limite by depth to the high water table, slow - rom flooding. permeability, nd weakly cemented layers. The growth of most per nial, deep-rooted crops is limited by the Guard-Devries-Rioblancho high wate able or the hardpan. Wher his unit is used for homesite development, 'oorly drained and somewhat poorly ed, moderately the m . limitations are depth to the high water table oarse textured and moderately fin tured soils that and t hardpan. The main hazard is rare flooding. re moderately dlbeendrain hardpan or are very Ons' sewage disposal is difficult because of depth to Peep and that hamost areas, on th ardpan and the high water table and may cause ,asin rims c tamination of the ground water. Dikes and channels This map unit long the eastern at have outlets for floodwater can protect buildings dge of the Sacruin Delta area. The rom flooding.