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124 Soil Survey S 'Timited ability of the soil to support a load. Houses, permeability, water applications should be regulated so E roads, and streets should be constructed above that the water does not stand on the surface and p( expected flood levels. damage the crops. The hardpan limits the suitability for sc This map unit is in capability units IIs-3 (MLRA-17), deep-rooted crops. Where feasible, deep ripping of this th irrigated, and IVs-3 (MLRA-17), nonirrigated. It is in restrictive layer can help to overcome this limitation. of soil group C. Furrow, border, and sprinkler irrigation systems are suitable. Maintaining crop residue on or near the W. vegetative 0 to 2 percent surface helps to prevent excessive runoff and increases hi atter content. 249—Stockton silty clay loam, the rate of water intake and the organic mNslopes, overwashed. This somewhat poorly drained, If this unit is used for homesite development, the w, nearly level soil is in basins. It is deep to a hardpan. It PE —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 ra strength. The rare flooding is a hazard. Properly wi drained soil; however, drainage has been improved by designing foundations and footings and diverting runoff irr levees and reclamation projects. A few areas are away from buildings help to prevent the structural to dissected by intermittent sloughs that have been filled Yand at as a result of land leveling. Elevation is 20 to 70 fet. sept cdamaytank absorption e caused by rfield , the slow 1pemOeabil permeability can _ The average annual precipitation is about 14 inches, he size A e by increasing t the average annual air temperature is about 20 degrees dayfield,/backfil ng the trench with sandy material, and n dE F, and the average frost-free period is about Y installing long absorption lines. Ripping the hardpan ar Typically, the surface layer is dark brown silty clay improves permeability and thus also improves the er loam about 12 inches thick. Below this is a buried suitability of the soil for septic tank absorption fields. surface layer of dark gray clay about 22 inches thick. Y can cri The upper part of the subsoil is grayish brown The Properly oflthe soil to support a load Houses, ar brownish gray clay loam about 13 inches thick. streets PE lower part to a depth of 60 inches is a brown Ced light ed expected alood levels. -17). be constructed above th, brownish gray, weakly cemented to stronglyThis map unit is in capability units IIs-5 (MLRA-17).. da hardpan. In some areas the surface layer is clay loam irrigated, and IVs-5 (MLRA-17), nonirrigated. It is in dE — or loam. soil group C. re:etative Included in this unit are small areas of Archerdale ve 9 TI. and Cogna soils on the slightly higher parts of the 250—Stockton clay, 0 to 2 percent slopes. This of — landscape and Hollenbeck soils on the slightly lower ha parts. Also included are small areas of Stockton soils somewhat poorly drained, nearly level soil is in basins. to a hardpan. It formed in alluvium derived Sy that are fine textured throughout and small areas of It is deep tol le indicaor soils that have a hardpan at a depth of 30 to 40 inches, from somewhat poorly drained rock sources. se howeves in the p,rdrainage has fei mainly where deep leveling cuts have been made. been im roved by levees and reclamation projects. A MIncluded areas make up about 15 percent of the total P few areas are dissected by intermittent sloughs that acreage. have been filled as a result of land leveling. Elevation is ca Permeability is slow in the Stockton soil. Available water capacity is moderate. The shrink-swell potential is Ss aboutlto l4 i 0chhesethe average annualannual precipitation e temperature p high. The effective rooting depth is limited by the is about 60 degrees F, and the average frost-free period gr hardpan at a depth of 40 to 60 inches. Depth to the gc water table is more than 5 feet, but water may be briefly is aboutTypically,0 days.surface layer is dark gray clay about 29 perched above the hardpan after periods of heavy lin rainfall or irrigation. Runoff is slow, and the hazard of inches thick. The upper 8 inches of the subsoil also is Pe TI- water erosion is slight. The rate of water intake in dark gray clay. The next 5 inches is light brownish gray irrigatedr erosion areas is lig inch per hour. The soil is subject and grayish brown clay loam. The lower part to a depth TI- of 60 inches is a variegated dark grayish brown and fol to rare flooding, which occurs during years of dark brown, weakly cemented to strongly cemented bu abnormally high precipitation. hardpan. In some areas the surface layer is silty clay, by ah Most areas of this unit are used for irrigated crops or silty clay loam, or clay loam. orchards. A few areas are used for homesite Included in this unit are small areas of Archerdale ba development. and Vi nolo soils on the slightly higher parts of the loi This unit is suited to irrigated row, field, and orchard landsca e; Galt and Jacktone soils in landscape crops. The main limitations are the slow permeability positions similar to those of the Stockton soil; and P and depth to the hardpan. Because of the restricted P