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v 124 Soil Survey V limited ability of the soil to support a load. Houses, permeability, water applications should be regulated so roads, and streets should be constructed above that the water does not stand on the surface and .. expected flood levels. damage the crops. The hardpan limits the suitability for This map unit is in capability units IIs-3 (MLRA-17), deep-rooted crops. Where feasible, deep ripping of this irrigated, and IVs-3 (MLRA-17), nonirrigated. It is in restrictive layer can help to overcome this limitation. vegetative soil group C. Furrow, border, and sprinkler irrigation systems are suitable. Maintaining crop residue on or near the 249—Stockton silty clay loam, 0 to 2 percent surface helps to prevent excessive runoff and increases slopes, overwashed. This somewhat poorly drained, the rate of water intake and the organic matter content. ►� nearly level soil is in basins. It is deep to a hardpan. It If this unit is used for homesite development, the formed in alluvium derived from mixed rock sources. main limitations are the high shrink-swell potential, the Mottles in the profile indicate a somewhat poorly slow permeability, depth to the hardpan, and low �. drained soil; however, drainage has been improved by strength. The rare flooding is a hazard. Properly levees and reclamation projects. A few areas are designing foundations and footings and diverting runoff dissected by intermittent sloughs that have been filled away from buildings help to prevent the structural as a result of land leveling. Elevation is 20 to 70 feet. damage caused by shrinking and swelling. On sites for The average annual precipitation is about 14 inches, septic tank absorption fields, the slow permeability can '! the average annual air temperature is about 60 degrees be.overcome by increasing the size of the absorption F, and the average frost-free period is about 270 days. field, backfilling the trench with sandy material, and Typically, the surface layer is dark brown silty clay installing long absorption lines. Ripping the hardpan loam about 12 inches thick. Below this is a buried improves permeability and thus also improves the surface layer of dark gray clay about 22 inches thick. suitability of the soil for septic tank absorption fields. The upper part of the subsoil is grayish brown and light Properly designing buildings and roads can offset the brownish gray clay loam about 13 inches thick. The limited ability of the soil to support a load. Houses, i lower part to a depth of 60 inches is a brown and light roads, and streets should be constructed above brownish gray, weakly cemented to strongly cemented expected flood levels. hardpan. In some areas the surface layer is clay loam This map unit is in capability units IIs-5 (MLRA-17), or loam. irrigated, and IVs-5 (MLRA-17), nonirrigated. It is in Included in this unit are small areas of Archerdale vegetative soil group C. and Cogna soils on the slightly higher parts of the landscape and Hollenbeck soils on the slightly lower 250—Stockton clay, 0 to 2 percent slopes. This parts. Also included are small areas of Stockton soils somewhat poorly drained, nearly level soil is in basins. that are fine textured throughout and small areas of It is deep to a hardpan. It formed in alluvium derived -;; soils that have a hardpan at a depth of 30 to 40 inches, from mixed rock sources. Mottles in the profile indicate mainly where deep leveling cuts have been made. a somewhat poorly drained soil; however, drainage has Included areas make up about 15 percent of the total been improved by levees and reclamation projects. A acreage. few areas are dissected by intermittent sloughs that Permeability is slow in the Stockton soil. Available have been filled as a result of land leveling. Elevation is water capacity is moderate. The shrink-swell potential is sea level to 100 feet. The average annual precipitation .. high. The effective rooting depth is limited by the is about 14 inches, the average annual air temperature hardpan at a depth of 40 to 60 inches. Depth to the is about 60 degrees F, and the average frost-free period water table is more than 5 feet, but water may be briefly is about 270 days. * perched above the hardpan after periods of heavy Typically, the surface layer is dark gray clay about 29 rainfall or irrigation. Runoff is slow, and the hazard of inches thick. The upper 8 inches of the subsoil also is water erosion is slight. The rate of water intake in dark gray clay. The next 5 inches is light brownish gray irrigated areas is 0.3 inch per hour. The soil is subject and grayish brown clay loam. The lower part to a depth to rare flooding, which occurs during years of of 60 inches is a variegated dark grayish brown and abnormally high precipitation. dark brown, weakly cemented to strongly cemented Most areas of this unit are used for irrigated crops or hardpan. In some areas the surface layer is silty clay, orchards. A few areas are used for homesite silty clay loam, or clay loam. development. Included in this unit are small areas of Archerdale This unit is suited to irrigated row, field, and orchard and Vignolo soils on the slightly higher parts of the crops. The main limitations are the slow permeability landscape; Galt and Jacktone soils in landscape IT' and depth to the hardpan. Because of the restricted positions similar to those of the Stockton soil; and r