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<br /> quin County, California 125
<br /> y yGuard, and Rioblancho soils in the slightly e s g tly lower soil for septic tank absorption fields. Properly designing �
<br /> s Also included are small areas of Stockton buildings and roads can offset the limited ability of the
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<br /> at are highly calcareous or saline-sodic soil to support a load. Houses, roads, and streets
<br /> out. Included areas make up about 15 percent should be constructed above expected flood levels.
<br /> total acreage. This ma unit is in capability units IIs-5 MLRA-17)
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<br /> eability is slow in the Stockton soil. Available irrigated, any d IVs-5 MLRA-17), nonirrigated. It is in
<br /> xcapacity is moderate. The shrink-swell potential is vegetative soil group C.
<br /> the effective rooting depth is limited by the
<br /> n:at a depth of 40 to 60 inches. Depth to the 251—Stockton-Urban land complex, 4 to 2 percent
<br /> sable is more than 5 feet, but water may be briefly slopes. This nearly level map unit is in basins.
<br /> etl above the hardpan after periods of heavy Elevation is 10 to 40 feet. The average annual
<br /> It'll-or irrigation. Runoff is slow, and the hazard of precipitation is about 14 inches, the average annual air
<br /> rosion is slight. The rate of water intake in temperature is about 60 degrees F, and the average
<br /> ted areas is 0.1 inch per hour. The soil is subject frost-free period is about 270 days.
<br /> e flooding, which occurs during years of This unit is 50 percent Stockton clay and 35 percent
<br /> jmally high precipitation. Urban land. The components of this unit occur as areas
<br /> ust areas are used for irrigated crops or orchards. so intricately intermingled that it was not practical to
<br /> -:areas are used as irrigated pasture or for urban map them separately at the scale used.
<br /> i,pment. This unit may provide wetland functions Included in this unit are small areas of Galt soils in
<br /> lralues. These should be considered in plans for landscape positions similar to those of the Stockton soil
<br /> ,cement of wildlife habitat or land use conversion. and Egbert and Ryde soils in the slightly lower
<br /> +''is unit is suited to irrigated row, field, and orchard positions. Also included are small areas of soils that
<br /> s,. The main limitations are the slow permeability have been altered by construction activities and
<br /> epth to the hardpan. Because of the restricted Stockton soils that have moderately coarse textured or
<br /> eability, water applications should be regulated so moderately fine textured overwash or that have a
<br /> ,the water does not stand on the surface and hardpan at a depth of 30 to 40 inches as a result of
<br /> glage the crops. The hardpan limits the suitability for leveling. Included areas make up about 15 percent of
<br /> r"p-rooted crops. Where feasible, deep ripping of this the total acreage.
<br /> .ictive layer can help to overcome this limitation. The Stockton soil is deep to a hardpan and is
<br /> .,Soil should be cultivated only within a narrow range somewhat poorly drained. It formed in alluvium derived
<br /> :moisture content. It is too sticky when wet and too from mixed rock sources. Mottles in the profile indicate
<br /> �d when dry. Furrow, border, and sprinkler irrigation a somewhat poorly drained soil; however, drainage has
<br /> Mems are suitable. Returning crop residue to the soil been improved by levees and reclamation projects.
<br /> regularly adding other organic material improves Typically, the surface layer is dark gray clay about 29
<br /> iiity, minimizes crusting, and increases the rate of inches thick. The upper 8 inches of the subsoil also is
<br /> ter intake. dark gray clay. The next 5 inches is mixed light
<br /> '.-his unit is suited to irrigated pasture, irrigation water brownish gray and grayish brown clay loam. The lower
<br /> n be applied by sprinkler and border methods. part to a depth of 60 inches is a variegated dark grayish r
<br /> eveling helps to ensure a uniform application of water. brown and dark brown, weakly cemented to strongly
<br /> per stocking rates, pasture rotation, and restricted cemented hardpan. In some areas the surface layer is
<br /> gazing during wet periods help to keep the pasture in silty clay, silty clay loam, or clay loam. I'
<br /> iod condition and protect the soil from compaction. Permeability is slow in the Stockton soil. Available J
<br /> 'lf this unit is used for urban development, the main water capacity is moderate. The shrink-swell potential is
<br /> imitations are the high shrink-swell potential, the slow high. The effective rooting depth is limited by the
<br /> rmeability, depth to the hardpan, and low strength. hardpan at a depth of 40 to 60 inches. Depth to the
<br /> e rare flooding is a hazard. Properly designing water table is more than 5 feet, but water may be briefly
<br /> foundations and footings and diverting runoff away from perched above the hardpan after periods of heavy
<br /> tuildings help to prevent the structural damage caused rainfall or irrigation. Runoff is slow, and the hazard of
<br /> y shrinking and swelling. On sites for septic tank water erosion is slight. The rate of water intake in
<br /> 'absorption fields, the slow permeability can be irrigated areas is 0.1 inch per hour. The soil is subject
<br /> ;overcome by increasing the size of the absorption field, to rare flooding, which occurs during years of
<br /> backfilling the trench with sandy material, and installing abnormally high precipitation.
<br /> ng absorption lines. Ripping the hardpan improves Urban land consists of areas covered by roads,
<br /> permeability and thus also improves the suitability of the driveways, sidewalks, parking lots, buildings, and other
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