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uin County, California 121 to srJbsidence. Runoff is very slow, and the Rioblancho soils in the slightly lower landscape of,water erosion is slight. The rate of water positions. Also included, in landscape positions similar rirr irrigated areas is 0.5 inch per hour. The to those of the dominant Scribner soil, are small areas "" .Of soil blowing is moderate. The soil is subject of Egbert soils and small areas of Scribner soils that flooding, which occurs during years of .�trrare, have been more extensively drained or that have a ncmally high precipitation, coarse textured substratum below a depth of 40 inches. rFMast areas are used for irrigated crops. A few areas Included areas make up about 15 percent of the total used for homesite development. This unit may acreage. wetland functions and values. These should be The Scribner soil is very dee and Poorly drained. P p y It �rrtsidered in plans for enhancement of wildlife habitat formed in alluvium derived from mixed rock sources. land use conversion. Mottles in the profile indicate a poorly drained soil; This unit is suited to irrigated row and field crops. however, drainage has been improved by levees and The main limitation is the high water table. General reclamation projects. Typically, the surface layer is nagement considerations include the hazard of soil grayish brown and dark gray, mottled clay loam about blowing. Areas adjacent to levees are subject to lateral 24 inches thick. The underlying material to a depth of ' weepage in wet years when the water level is high. 60 inches is stratified dark gray, mottled silt loam, clay xCareful applications of irrigation water are needed to loam, and silty clay loam. In some areas the surface prevent the buildup of a high water table. Deep layer is mucky clay loam or silty clay loam, ditches can lower the water table if a suitable Permeability is moderately slow in the Scribner rdrainage � y soil.. ;outlet is available. Deep-rooted crops can be grown in Available water capacity is very high. The effective ,< areas where natural drainage is adequate or where a rooting depth of the crops commonly grown in the drainage system has been installed. Furrow, border, county is limited by an apparent water table that has ..,.and sprinkler irrigation systems are suitable. When the been lowered to a depth of 3 to 5 feet through drainage :,wind velocity is high in spring, the hazard of soil systems that require continual maintenance. This soil is lowing can be reduced by properly managing all crop subject to subsidence. Runoff is very slow, and the residue and by minimizing tillage. hazard of water erosion is slight.- t. The r p g ate of water . if this unit is used for homesite development, the intake in irrigated areas is 0.5 inch per hour. The AIn limitations are subsidence, low strength, the high hazard of soil blowing is moderate. The soil is subject vater table and the rapid permeability in the sandy to rare flooding, which occurs during years of substratum. The rare flooding is a hazard. Properly abnormally high precipitation. :designing buildings and roads can offset the limited Urban land consists of areas covered by roads, Fabity of the soil to support a load. A drainage system driveways, sidewalks, parking lots, buildings, and other 5iileeded if roads or building foundations are structures. The soil material under the impervious constructed. Community sewage systems may be surface is similar to that of Scribner clay loam. i �yseeded because seepage from onsite sewage disposal Most areas are used for urban development. A few i tems can result in the contamination of water areas are used for irrigated crops. This supplies. Houses, roads, and streets should be provide wetland functions and values. These should be constructed above expected flood levels. p considered in plans for enhancement of wildlife habitat Fi,Jhis map unit is in capability units Ilw-2 (MLRA-17), or land use conversion. rgated, and IVw-2 (MLRA-17), nonirrigated. It is in Where the Scribner soil is used for urban .°'vegetative soil group A. development, the main limitations are subsidence, low strength, the moderately slow permeability, and the high F;:245Scribner-Urban land complex, partially water table. The rare flooding is a hazard. Properly `drained, 0 to 2 percent slopes. This nearly level map designing buildings and roads can offset the limited f"nit is on flood plains. Elevation is near sea level to 10 ability of the soil to support a load. The moderately slow et above above. The average annual precipitation is about permeability and the high water table increa h ...'4 inches the average annual air temperature is about possibility that septic tank absorption fields wilt l not tit)degrees F, and the average frost-free period is about function� properly. A drainage system is needed if roads ays.�0 dt or building foundations are constructed. Houses, roads, . .This unit is 50 percent Scribner clay loam and 35 and streets should be constructed above expected flood Percent Urban land. The components of this unit occur levels. rareas so intricately intermingled that it was not This unit is suited to irrigated row and field crops. actical to map them separately at the scale used. The main limitation is the high water table. General Included in this unit are small areas of Stockton and management considerations include the hazard of soil