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67 San Joaquin County, California areas make up about 15 percent of the total acreage. Included in this unit are small areas of Guard soils Permeability is moderately rapid in the Grangeville that have a perched water table below a depth of 5 feet. soil. Available water capacity is moderate. The effective These soils are on the slightly higher parts of the rooting depth of the crops commonly grown in the landscape. Also included are small areas of Kingile and county is limited by an apparent water table that has Ryde soils in the slightly lower landscape positions. been lowered to a depth of 4 to 6 feet through drainage Included areas make up about 15 percent of the total systems that require continual maintenance. Runoff is acreage. slow, and the hazard of water erosion is slight. The rate Permeability is slow in the Guard soil. Available of water intake in irrigated areas is 0.5 inch per hour. water capacity is high. The effective rooting depth of the The soil is subject to rare flooding, which occurs during crops commonly grown in the county is limited by a years of abnormally high precipitation. perched water table at a depth of 1.5 to 3.0 feet. Runoff Most areas are used for irrigated crops. A few areas is slow, and the hazard of water erosion is slight. The ` are used for homesite development. This unit may rate of water intake in irrigated areas is 0.5 inch per provide wetland functions and values. These should be hour. The soil is subject to rare flooding, which occurs considered in plans for enhancement of wildlife habitat during years of abnormally high precipitation. or land use conversion. Most areas are used for irrigated crops. This unit This unit is suited to irrigated row and field cropsmay provide wetland functions and values. These The main limitation is the high water table. Areas should be considered in plans for enhancement of adjacent to levees are subject to lateral seepage in wet wildlife habitat or land use conversion. r years when the water level is high. Careful applications This unit is,suited to irrigated row and field crops. of irrigation water are needed to prevent the buildup of The main limitatlons are the high water table, depth to a high water table. Tile drainage can lower the water the weakly cemented substratum, and the slow table if a suitable outlet is available. Furrow, border, permeability. Careful applications of irrigation water are and sprinkler irrigation systems are suitable. Returning needed to prevent the buildup of a high water table. Tile crop residue to the soil or regularly adding other organic drainage can lower the water table if a suitable outlet is material improves fertility, minimizes crusting, and available. The weakly cemented substratum limits the increases the rate of water intake. suitability for deep-rooted crops. Where feasible, deep If this unit is used for homesite development, the ripping of this restrictive layer can help to overcome this main limitation is the high water table. The rare flooding limitation. Because of the restricted permeability, water is a hazard. The high water table increases the applications should be regulated so that the water does possibility that septic tank absorption fields will not not stand on the surface and damage the crops. function properly. A drainage system is needed if roads Furrow, border, and sprinkler irrigation systems are or building foundations are constructed. Houses, roads, suitable. Returning crop residue to the soil or regularly and streets should be constructed above expected flood adding other organic material improves fertility, levels. minimizes crusting, and increases the rate of water This map unit is in capability units Ilw-2 (MLRA-17), intake. irrigated, and IVw-2 (MLRA-17), nonirrigated. It is in This map unit is in capability units Illw-2 (MLRA-17), vegetative soil group A. irrigated, and IVw-2 (MLRA-17), nonirrigated. It is in vegetative soil group E. 168—Guard clay loam, 0 to 2 percent slopes. This r, very deep, poorly drained, nearly level soil is on basin 169--Guard clay loam, drained, o to 2 percent rims. It formed in alluvium derived from mixed rock slopes. This very deep, poorly drained, nearly level soil sources. Elevation is 5 feet below sea level to 5 feet is on basin rims. It formed in alluvium derived from above. The average annual precipitation is about 14 mixed rock sources. Mottles in the profile indicate a inches, the average annual air temperature is about 60 poorly drained soil; however, drainage has been degrees F, and the average frost-free period is about improved by levees and reclamation projects. Elevation 270 days. is 5 feet below sea level to 25 feet above. The average 6. Typically, the surface layer is dark gray and gray, annual precipitation is about 14 inches, the average mottled clay loam about 15 inches thick. The underlying annual air temperature is about 60 degrees F, and the material to a depth of 72 inches is light gray and light average frost-free period is about 270 days. olive gray, mottled clay loam. The soil is calcareous Typically, the surface layer is dark gray and gray, throughout and is weakly cemented with lime below a mottled clay loam about 15 inches thick. The underlying depth of 15 inches. In some areas the surface layer is material to a depth of 72 inches is light gray and light loam. olive gray, mottled clay loam. The soil is calcareous