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Soil Survey
<br /> San Joaquin County, California
<br /> permeability, water applications should be regulated so Egbert, Guard, and Rioblancho soils in the slightly lower
<br /> that the water does not stand on the surface and positions. Also included are small areas of Stockton
<br /> damage the crops. The hardpan limits the suitability for soils that are highly calcareous or saline-sodic
<br /> ` deep-rooted crops. Where feasible, deep ripping of this throughout. Included areas make up about 15 percent
<br /> restrictive layer can help to overcome this limitation. of the total acreage.
<br /> Furrow, border, and sprinkler irrigation systems are permeability is slow in the Stockton soil. Available
<br /> suitable. Maintaining crop residue on or near the water capacity is moderate. The shrink-swell potential is
<br /> surface helps to prevent excessive runoff and increases high. The effective rooting depth is limited by the
<br /> the rate of water intake and the organic matter content. hardpan at a depth of 40 to 60 inches. Depth to the
<br /> If this unit is used for homesite development, the water table is more than 5 feet, but water may be briefly
<br /> main limitations are the high shrink-swell potential, the perched above the hardpan after periods of heavy
<br /> slow permeability, depth to the hardpan, and low rainfall or irrigation. Runoff is slow, and the hazard of
<br /> strength. The rare flooding is a hazard. Properly water erosion is slight. The rate of water intake in
<br /> ` designing foundations and footings and diverting runoff irrigated areas is 0.1 inch per hour. The soil is subject
<br /> away from buildings help to prevent the structural to rare flooding, which occurs during years of
<br /> damage caused by shrinking and swelling. On sites for abnormally high precipitation.
<br /> septic tank absorption fields, the slow permeability can Most areas are used for irrigated crops or orchards.
<br /> "r be.overcome by increasing the size of the absorption A few areas are used as irrigated pasture or for urban
<br /> field, backfilling the trench with sandy material, and development. This unit may provide wetland functions
<br /> installing long absorption lines. Ripping the hardpan and values. These should be considered in plans for
<br /> improves permeability and thus also improves the enhancement of wildlife habitat or land use conversion.
<br /> suitability of the soil for septic tank absorption fields. This unit is suited to irrigated row, field, and orchard
<br /> Properly designing buildings and roads can offset the crops. The main limitations are the slow permeability
<br /> limited ability of the soil to support a load. Houses, and depth to the hardpan. Because of the restricted
<br /> roads, and streets should be constructed above permeability, water applications should be regulated so
<br /> expected flood levels. that the water does not stand on the surface and
<br /> This map unit is in capability units IIs-5 (MLRA-17), " damage the crops. The hardpan limits the suitability for
<br /> irrigated, and IVs-5 (MLRA-17), nonirrigated. It is in deep-rooted crops. Where feasible, deep ripping of this
<br /> vegetative soil group C. restrictive layer can help to overcome this limitation.
<br /> The soil should be cultivated only within a narrow range
<br /> 250—Stockton clay, 0 to 2 percent slopes. This of moisture content. It is too sticky when wet and too
<br /> somewhat poorly drained, nearly level soil is in basins. hard when dry. Furrow, border, and sprinkler irrigation
<br /> It is deep to a hardpan. It formed in alluvium derived systems are suitable. Returning crop residue to the soil
<br /> from mixed rock sources. Mottles in the profile indicate or regularly adding other organic material improves
<br /> a somewhat poorly drained soil; however, drainage has fertility, minimizes crusting, and increases the rate of
<br /> been improved by levees and reclamation projects. A water intake.
<br /> few areas are dissected by intermittent sloughs that 7 1
<br /> This unit is suited to irrigated pasture. Irrigation water
<br /> have been filled as a result of land leveling. Elevation is can be applied by sprinkler and border methods.
<br /> is sea level to 100 feet. The average annual precipitation Leveling helps to ensure a uniform application of water.
<br /> is about 14 inches, the average annual air temperature Proper stocking rates, pasture rotation, and restricted
<br /> is about 60 degrees F, and the average frost-free period grazing during wet periods help to keep the pasture in
<br /> fly is about 270 days. good condition and protect the soil from compaction.
<br /> Typically, the surface layer is dark gray clay about 29 If this unit is used for urban development, the main
<br /> inches thick. The upper 8 inches of the subsoil also is limitations are the high shrink-swell potential, the slow
<br /> dark gray clay. The next 5 inches is light brownish gray i permeability, depth to the hardpan, and low strength.
<br /> and grayish brown clay loam. The lower part to a depth The rare flooding is a hazard. Properly designing
<br /> of 60 inches is a variegated dark grayish brown and foundations and footings and diverting runoff away from
<br /> dark brown, weakly cemented to strongly cemented buildings help to prevent the structural damage caused
<br /> or hardpan. In some areas the surface layer is silty clay, by shrinking and swelling. On sites for septic tank
<br /> silty clay loam, or clay loam. absorption fields, the slow permeability can be
<br /> Included in this unit are small areas of Archerdale overcome by increasing the size of the absorption field,
<br /> d and Vignolo soils on the slightly higher parts of the backfilling the trench with sandy material, and installing
<br /> landscape; Galt and Jacktone soils in landscape long absorption lines. Ripping the hardpan improves
<br /> positions similar to those of the Stockton soil; and permeability and thus also improves the suitability of the
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