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' San Joaquin County, California 95 bedrock in convex positions near the top of the slopes. areas make up about 15 percent of the total acreage. Included areas make up about 15 percent of the total Permeability is moderately rapid in the Pentz soil. acreage. Available water capacity is very low. The effective Permeability is moderately rapid in the Pentz soil. rooting depth is limited by the bedrock at a depth of 10 ' Available water capacity is very low. The effective to 20 inches. Runoff is medium, and the hazard of rooting depth is limited by the bedrock at a depth of 10 water erosion is slight or moderate. to 20 inches. Runoff is rapid, and the hazard of water Most areas are used for livestock grazing. A few ' erosion is severe. areas are used for homesite development. This unit This unit is used mainly for livestock grazing. General may provide wetland functions and values. These management considerations include the very low should be considered in plans for enhancement of available water capacity, the limited depth, and the wildlife habitat or land use conversion. ' severe hazard of erosion. The characteristic plant Where this unit is used for livestock grazing, general community is mainly soft chess, ripgut brome, and management considerations include the hazard of filaree. The very low available water capacity limits the erosion, the very low available water capacity, the ' production of desirable forage plants. Fencing is difficult limited depth, and the content of cobbles in the surface because of the depth to bedrock. Grazing should be layer. The characteristic plant community is mainly soft controlled so that desirable vegetation, such as soft chess, wild oat, and filaree. Grazing should be ' chess, is maintained and enough vegetation is left controlled so that desirable vegetation, such as soft standing to protect The soil from erosion. Loss of the chess, is maintained and enough vegetation is left surface layer results in a severe decrease in standing to protect the soil from erosion. Loss of the productivity and in the potential of the unit to produce surface layer results in a severe decrease in ' plants suitable for grazing. productivity and in the potential of the unit to produce If this unit is used as a source of firewood, the plants suitable for grazing. The very low available water canopy cover will be reduced as a result of the low capacity limits the production of desirable forage plants. ' resprouting potential of blue oak. Because of the Fencing is difficult because of the depth to bedrock. moderately steep and steep slopes, harvesting the If this unit is used for homesite development, the firewood is difficult. Minimizing the extent of surface main limitation is the depth to bedrock. General disturbance during harvesting reduces the hazard of management considerations include the hazard of t accelerated erosion, erosion. The cuts needed to provide essentially level This map unit is capability subclass Vle (MLRA-18), building sites can expose the bedrock. Because of the nonirrigated. It is in vegetative soil group G. depth to bedrock, the size of absorption fields should be increased or specially designed sewage disposal ' 208—Pentz cobbly sandy loam, 5 to 8 percent systems should be used. Excavation for roads and slopes. This shallow, well drained, gently rolling soil is buildings increases the hazard of erosion. on hills. It formed in material weathered from basic This map unit is in capability subclass Vie ' andesitic, tuffaceous sandstone. The native vegetation (MLRA-18), nonirrigated. It is in vegetative soil group G. is mainly annual grasses and forbs. Elevation is 135 to 300 feet. The average annual precipitation is about 16 209—Pentz-Bellota complex, 2 to 15 percent inches, the average annual air temperature is 60 slopes. These undulating to rolling soils are on hills. degrees F, and the average frost-free period is about They are commonly in concave areas at the base of 270 days. steeper slopes. Most areas receive runoff from the Typically, the surface layer is grayish brown cobbly higher adjacent areas. The native vegetation is mainly ' sandy loam about 8 inches thick. The subsoil is brown annual grasses and forbs. Elevation is 170 to 340 feet. cobbly sandy loam about 5 inches thick. Light gray, The average annual precipitation is about 17 inches, moderately consolidated, basic andesitic, tuffaceous the average annual air temperature is about 60 degrees ' sandstone bedrock is at a depth of 13 inches. In some F, and the average frost-free period is about 270 days. areas the surface layer is gravelly sandy loam. This unit is 55 percent Pentz loam and 30 percent Included in this unit are small areas of Alamo soils in Bellota loam. The Pentz soil is on concave or convex drainageways; small areas of Pardee and Redding soils slopes, and the Bellota soil is on concave slopes. The ' on terraces; small areas of Peters soils in the slightly components of this unit occur as areas so intricately lower landscape positions; and, on toe slopes, small intermingled that it was not practical to map them areas of Pentz soils that have slopes of 2 to 5 percent. separately at the scale used. ' Also included are small areas of Lithic Xerorthents in Included in this unit are small areas of Hicksville and convex positions near the top of the slopes. Included Yellowlark soils in drainageways, Kaseberg and Pardee