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� V San Joaquin County, California 17 water table in some areas of the Stomar and Capay are in landscape positions similar to those of the Veritas soils. soils. Merritt soils are poorly drained and are on flood Where this unit is used for homesite development, plains. Urban land is covered by streets, parking lots, the main limitations are slow permeability, a high shrink- buildings, and other structures. swell potential, and low strength in areas of the Capay Areas of this unit are used mainly as irrigated and Stomar soils and moderately slow permeability, a cropland. A few areas are used for homesite moderate shrink-swell potential, and low strength in development. The major soils are suited to irrigated areas of the Zacharias soils. The restricted permeability crops. Limitations include depth to the hardpan in the should be considered when onsite sewage disposal Veritas soils and a low available water capacity in. the systems are designed. Structural damage can result Delhi and Tinnin soils. The growth of deep-rooted crops from the shrink-swell potential and low strength. These is limited by the hardpan in the Veritas soils. The main limitations should be considered when foundations, hazard is soil lowing. buildings, and roads are designed. Where this unit is used for homesite development, Where this unit is used for dryland grain crops, the the Veritas soils are limited by depth to the hardpan. main limitation is low rainfall. The amount of Delhi soils are limited by rapid permeability. The main precipitation is not sufficient for annual cropping. hazard in areas of the Tfnnin and Veritas soils is rare flooding. The suitability of the Veritas soils for onsite 10. Delhi-Veritas-Tinnin sewage disposal can be improved by ripping the Moderately well drained to somewhat excessively hardpan. In areas used for onsite sewage disposal, drained, coarse textured and moderately coarse textured rapid permeability in the Delhi and Tinnin soils and in soils that are deep to a cemented hardpan or are very Veritas soils in which the hardpan has been ripped can deep;on dunes, alluvial fans, and low fan terraces result in contamination of the ground water. Dikes and channels that have outlets for floodwater can protect This map unit is on dunes, low fan terraces, and buildings from flooding. alluvial fans along the Stanislaus River in the southern and southeastern parts of the county. The soils formed11. Archerdale-Cogna-Finrod in alluvium derived from granitic and mixed rock sources. Moderately well drained and well drained, medium This unit makes up about 10 percent of the survey textured and moderately fine textured soils that are deep area. It is about 35 percent Delhi and similar soils, 26 to a cemented hardpan or are very deep; on alluvial fans percent Veritas and similar soils, 22 percent Tinnin and and low fan terraces similar soils, and 17 percent components of minor This map unit is on alluvial fans and low fan terraces extent. along the Calaveras River in the central part of the Delhi soils are on dunes that have been leveled. county. The soils formed in alluvium derived from mixed They are very deep and somewhat excessively drained. rock sources. Slope ranges from 0 to 2 percent. Typically, the surface This unit makes up about 6 percent of the survey layer and underlying material are coarse textured. The area. It about 37 percent Archerdale and similar soils, hazard of soil blowing is severe. 30 percent Cogna and similar soils, 18 percent Finrod Veritas soils are on low fan terraces. They are 40 to and similar soils, and 15 percent components of minor 60 inches deep to a cemented hardpan and are extent. The major components do not occur together in moderately well drained. Slope ranges from 0 to 2 all of the delineations. percent. Typically, the surface layer and subsoil are Archerdale soils are very deep and well drained. moderately coarse textured. The soils are subject to Slope ranges from 0 to 2 percent. Typically, the surface rare flooding. layer is moderately fine textured, and the subsoil is fine Tinnin soils are on low fan terraces and alluvial fans. textured. The shrink-swell potential is high. The soils They are very deep and well drained. Slope ranges are subject to rare flooding. from 0 to 2 percent. Typically, the surface layer and Cogna soils are very deep and well drained. Slope underlying material are coarse textured. The hazard of ranges from 0 to 2 percent. Typically, the surface layer soil blowing is severe. The soils are subject to rare is medium textured. The subsoil and underlying material flooding. are moderately fine textured and medium textured. The Minor in this unit are the Bisgani, Manteca, and soils are subject to rare flooding. Merritt soils and Urban land. Bisgani soils are poorly Finrod soils are 40 to 60 inches deep to a cemented drained and are on the lower alluvial fans. Manteca hardpan and are moderately well drained. Slope ranges soils are moderately deep to a cemented hardpan and from 0 to 2 percent. Typically, the surface layer is r �