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Soil Survs. San Joaquin County, California Most areas are used for livestock grazing. A fey, bedrock in convex positions near the top of the slopes. areas are used for homesite development. This unit Included areas make up about 15 percent of the total may provide wetland functions and values. These acreage. should be considered in plans for enhancement of Permeability is moderately rapid in the Pentz soil. wildlife habitat or land use conversion. Available water capacity is very low. The effective Where this unit is used for livestock grazing, gener.- rooting depth is limited by the bedrock at a depth of 10 management considerations include the hazard of to 20 inches. Runoff is rapid, and the hazard of water erosion, the limited depth, and the very low available erosion is severe. water capacity. The characteristic plant community is This unit is used mainly for livestock grazing. General mainly soft chess, ripgut brome, wild oat, and filaree. management considerations include the very low Grazing should be controlled so that desirable available water capacity, the limited depth, and the vegetation, such as soft chess, is maintained and severe hazard of erosion. The characteristic plant enough vegetation is left standing to protect the soil community is mainly soft chess, ripgut brome, and from erosion. Loss of the surface layer results in a filaree. The very low available water capacity limits the severe decrease in productivity and in the potential of production of desirable forage plants. Fencing is difficult the unit to produce plants suitable for grazing. Fencing because of the depth to bedrock. Grazing should be is difficult because of the depth to bedrock. The very controlled so that desirable vegetation, such as soft low available water capacity limits the production of chess, is maintained and enough vegetation is left desirable forage plants. standing to protect the soil from erosion. Loss of the If this unit is used for homesite development, the surface layer results in a severe decrease in main limitation is the depth to bedrock. General productivity and in the potential of the unit to produce management considerations include the hazard of plants suitable for grazing. erosion. The cuts needed to provide essentially level If this unit is used as a source of firewood, the building sites can expose the bedrock. Because of th:=- canopy cover will be reduced as a result of the low depth to bedrock, the size of septic tank absorption resprouting potential of blue oak. Because of the fields should be increased or specially designed moderately steep and steep slopes, harvesting the sewage disposal systems should be used. Excavation firewood is difficult. Minimizing the extent of surface i for roads and buildings increases the hazard of erosic�i. disturbance during harvesting reduces the hazard of i This map unit is in capability subclass Vie accelerated erosion. f (MLRA-18), nonirrigated. It is in vegetative soil grout; a. This map unit is capability subclass Vie (MLRA-18), I nonirrigated. It is in vegetative soil group G. c 207—Pentz sandy loam, 15 to 50 percent slopes. i This shallow, well drained, moderately steep and ste, . 208—Pentz cobbly sandy loam, 5 to 8 percent soil is on hills. It formed in material weathered from slopes. This shallow, well drained, gently rolling soil is k basic andesitic, tuffaceous sandstone. Slopes are on hills. It formed in material weathered from basic convex. Areas are narrow and sinuous and descend andesitic, tuffaceous sandstone. The native vegetation from the adjacent high terraces. Strongly consolidated is mainly annual grasses and forbs. Elevation is 135 to strata crop out as bands across the slopes in some 300 feet. The average annual precipitation is about 16 areas. The native vegetation is mainly annual grasser inches, the average annual air temperature is 60 and forbs and includes blue oak in most areas. degrees F, and the average frost-free period is about l Elevation is 170 to 360 feet. The average annual 270 days. precipitation is about 17 inches. The average annua' _iir Typically, the surface layer is grayish brown cobbly f temperature is about 60 degrees F, and the average; sandy loam about 8 inches thick. The subsoil is brown e frost-free period is about 270 days. cobbly sandy loam about 5 inches thick. Light gray, l Typically, the surface layer is brown sandy loam moderately consolidated, basic andesitic, tuffaceous ti about 4 inches thick. The subsoil is brown and light sandstone bedrock is at a depth of 13 inches. In some F yellowish brown loam about 11 inches thick. Light g areas the surface layer is gravelly sandy loam. andesitic, tuffaceous sandstone bedrock is at a dep' of luded in this unit are small areas of Alamo soils in E 15 inches. In some areas the surface layer is loan, dna n geways; small areas of Pardee and Redding soils s gravelly loam, or gravelly sandy loam. on terraces; small areas of Peters soils in the slightly c Included in this unit are small areas of Bellota ar.,: lower landscape positions; and, on toe slopes, small it Keyes soils at the base of the slopes and Pardee areas of Pentz soils that have slopes of 2 to 5 percent. s Redding soils on high terrace remnants. Also inclUd Also included are small areas of Lithic Xerorthents in are small areas of Lithic Xerorthents and exposed convex positions near the top of the slopes. Included Y