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20 Soil Survey Four map units are in this group. They make up percent. Typically, the surface layer is moderately about 12 percent of the survey area. coarse textured. The subsoil is a fine textured claypan in the upper part and dense, weakly cemented 15. Carbona-Pleito sediments in the lower part. The shrink-swell potential is Well drained, moderately fine textured soils that re very high in the subsoil. The hazard of water erosion is deep; on dissected terraces moderate. This map unit is on uplifted, dissected to aces along San Joaquin soils are 20 to 40 inches deep to a the base of the Coast Range in the south estern part cemented hardpan. Slope ranges from 0 to 8 percent. Typically, the surface layer is moderately coarse of the county. The soils formed in alluvi derived from textured. The subsoil is a fine textured claypan in the mixed rock sources. This unit makes up less than 1 per ent of the survey upper part and a hardpan in the lower part. The shrink- area. It is about 76 percent Carbon and similar soils, swell potential is high in the subsoil. Rocklin soils are 20 to 40 inches deep to a cemented 21 percent Pleito and similar soils. nd 3 percent hardpan. Slope ranges from 0 to 5 percent. Typically, components of minor extent. the surface layer is moderately coarse textured. The Carbona soils have a slope 2 to 8 percent. subsoil is moderately coarse textured and moderately Typically, the surface layer an subsoil are moderately fine textured. The hazard of water erosion is moderate fine textured. The soils are c Icareous between depths of 25 and 60 inches. The s rink-swell potential is high. in some areas. Pleito soils have a slo of 2 to 8 percent. Typically, Minor in this unit are the Hicksville and Redding the surface layer and u erlying material are soils. Hicksville soils are very deep or deep. They are occasionally flooded and are in dissected moderately fine texture . drainageways. Redding soils are gravelly. They are on Minor in this unit are the Reiff soils and Xerofluvents. the higher terraces. /be soils are medi m textured. They are on the lower Areas of this unit are used mainly for livestock al fans. Xero uvents are occasionally flooded and dissected rainageways. grazing or dryland grain crops. A few areas are use �r eas of the unit are used mainly for livestock homesite development, irrigated pasture, or vineya. ng or wil life habitat. A few areas are used for The major soils are suited to the vegetation used for nd grafi crops. If irrigation water is available, the livestock grazing. Few limitations affect this use. The an b used for irrigated crops. The major soils are soils are suited to dryland crops. The main limitation is to e vegetation used for livestock grazing. Few low rainfall. Water erosion is a hazard in the more ltio s affect this use. The soils are suited to sloping areas. The amount of precipitation is not n grain crops. The main limitation is low rainfall. sufficient for annual cropping. The soils should be tilled mount of precipitation is not sufficient for annual on the contour or across the slope. in Water erosion is a hazard in the more slo in Where this unit is used for homesite development, g' pgthe main limitation is depth to the claypan or hardpan. . The Cometa and San Joaquin soils also are limited by a 16. Cometa-San Joaquin-Rocklin high shrink-swell potential, low strength, and very slow permeability. Onsite sewage disposal is difficult Moderately well drained, moderately coarse textured because of the very slow permeability in the Cometa soils that are moderately deep to weakly cemented and San Joaquin soils and the hardpan in the San sediments or a cemented hardpan, on dissected terraces Joaquin and Rocklin soils. Structural damage can result This map unit is on dissected terraces in the eastern from the high shrink-swell potential and low strength. part of the county. The soils formed in old alluvium These limitations should be considered when derived from granitic rock sources. foundations, buildings, and roads are designed. This unit makes up about 4 percent of the survey Where this unit is used for irrigated pasture or area. It is about 37 percent Cometa and similar soils, 30 vineyard crops, the main limitation is depth to the percent San Joaquin and similar soils, 19 percent claypan or hardpan. The San Joaquin and Rocklin soils Rocklin and similar soils, and 14 percent components of are limited by a low or very low available water capacity minor extent. in some areas. The main hazard is water erosion in the Cometa soils are 24 to 40 inches deep to weakly more sloping areas. The soils should be tilled on the cemented sediments. Slope ranges from 5 to 15 contour or across the slope.