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38 Soil 121—Capay clay, wet 0 to 2 percent slopes. This increase the possibility that septic tank absorpi very deep, moderately well drained, nearly level soil is will not function properly. The slow permeabilit+ in interfan.basins. It formed in alluvium derived from overcome by increasing-the size of the absorpt kf" mixed rock sources. It has a high water table as a result Properly designing foundations and footings an of the application of help from buildings irrigation water. Drainage systems diverting runoff afs g 9 P to pre that require continual maintenance have been used to structural damage caused by shrinking and sw+ 'IIi 'I lower the water table. Elevation is 25 to 140 feet. The Properly designing buildings and roads can off; average annual precipitation is about 10 inches, the limited abilityof the soil to support pport a load. A dr, average annual air temperature is about 60 degrees F, system is needed it roads or building foundatio '€ and the average frost-free period is about 270 days. constructed. 3E �Ii Typically, the surface layer is grayish brown and dark This map unit is in capability units Ilw-5 (MLI grayish brown clay about 20 inches thick. The upper 24 irrigated, and IVw-5 (MLRA-17), nonirrigated. It I Y:1 inches of the subsoil is grayish brown, dark grayish vegetative 'soil group C. g =E�,II,I' brown, and dark brown clay. The.lower part to a depth i of 60 inches is pale brown silty clay loam and clay 122—Capay-Urban land complex, 0 to 2 pe €F f E loam. The soil is calcareous below a depth of 20 slopes. This nearly level map unit is in interfan inches. In some areas the surface layer is silty clay. Elevation is 30 to 200 feet. The average annua it Included in this unit are small areas of EI Solyo, precipitation is about 10 inches; the average ar Stomar,.and Vernalis soils on the slightly higher parts of temperature is about 60 degrees F, and the av( 'J" { the landscape. Also included are small areas of fine frost-free period is about 270 days. textured soils that are-saline-sodic in some part or that This unit is 50 percent Capay clay and 35 pe do not have a perched water table. Included areas Urban landT . he components Of this unit occur; make up about 15 percent of the total acreage. so intricately intermingled that it was not practic „Y€i! Permeability is slow in the Capay sail. Available map them separately at the scale used. water capacity is high. The-shrink-swell potential also is Included in this unit are small areas of EI Sol high. The effective rooting depth of the crops commonlyStomar, and Vernalis soils on the slightly higher €art I4 grown in the county-is limited by a perched water table the landscape. Also included are small areas of at a depth of 4 to 6 feet. Runoff is slow, and the hazard that have been altered by construction activities of water erosion is slight. The rate of water intake in fine textured soils that have a.perched water tal irrigated areas is 0.1 inch per hour. depth p of 48 inches. Included areas make up abc Most areas of this unit are used for irrigated crops or percent of the total acreage. A few ew areas are used for homesite The Capay soil is very deep and moderatelydevelopment. drained. It formed in alluvium derived from mixe This unit is suited to irrigated row, field, and orchard sources. Typically, the surface layer is grayish t crops. The main limitations are the high water table and and dark grayish brown clayabout 20 inches aches thr ,q the slow permeability. Deep-rooted crops can be grown subsoil to a depth of 60 inches is grayish brown in areas where natural drainage is adequate or where a grayish brown, and dark brown clay. In some an drainage system has been installed. Tile drainage can surface layer is silty clay. €f €l lower the water table if a suitable outlet is available. Permeability is slow in the Capay soil. Availat Careful applications of irrigation water are needed to water capacity is high. The shrink-swell potentia permeability, the applications should be Depth to the water table i prevent the buildup of a high water table. Because of high. The effective rooting depth. is 60 inches or � �f 'I the restricted s more than 6 feet. Ru€ regulated so that the water does not stand on the slow, and the hazard of water erosion is slight. 7 'i'j surface and damage the crops. The soil should be of water intake in irrigated areas is 0.1 inch per I i';: cultivated only within a narrow range of moisture Urban land consists of areas covered by road ,a content. It is too sticky when wet and too hard when driveways, sidewalks, parking lots, buildings, an( dry. Returning crop residue to the soil or regularly g Y structures. The soil material under the imperviou € adding other organic material improves fertility, surface is similar to that of the Capay soil. fef minimizes crusting, and increases the rate of water Most areas of this unit are used for urban l intake. development. A few areas are used for irrigated If this unit is used for homesite development, the or orchards. 'tr,lj;;f main limitations are the slow permeability, the high Where the Capay soil is used for urban develc shrink-swell potential, low strength, and the high water the main limitations are the slow permeability, lo, table. The slow permeability and the high water table strength, and the high shrink-swell potential. On a r€f TPS