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19 <br /> <br />17 to 22 inches – light olive-brown heavy silt loam; massive; very hard when dry, firm <br />when moist, plastic and sticky when wet; medium acid. <br />22+ inches – grayish-brown shale. <br />• PgB: Pleasanton gravelly loam, 3 to 12 percent slopes – The Pleasanton series <br />consists of very deep, well-drained, loamy soils. These soils formed in alluvium from <br />sedimentary rock. Runoff is slow to medium, and the erosion hazard is slight to <br />moderate. Its stratified layers consist of the following (colors are for dry soil unless <br />otherwise stated). <br />0 to 21 inches – grayish-brown gravely loam; massive or very weak granular structure; <br />hard when dry, friable when moist, slightly sticky and slightly plastic when wet; slightly <br />acid to neutral. <br />21 to 62 inches – dark-brown gravely clay loam; moderate subangular blocky structure; <br />very hard when dry, friable when moist, sticky and plastic when wet; neutral. <br />62 to 72 inches – yellowish-brown gravely silt loam; massive or weak blocky structure; <br />hard when dry, friable when moist, sticky and slightly plastic when wet; mildly alkaline. <br />• PoC2: Positas gravelly loam, 2 to 20 percent slopes, eroded – The Positas series <br />consists of well-drained to excessively drained, shallow to moderately deep gravely <br />loam soils. These soils formed in poorly sorted clay, sand, and gravel that are weakly <br />consolidated in places. This well-drained soil has a very slowly permeable subsoil. <br />Runoff is slow to medium, and the available water holding capacity is low. Root <br />penetration is shallow. The erosion hazard is slight to moderate. Its stratified layers <br />consist of the following (colors are for dry soil unless otherwise stated). <br />0 to 11 inches – brown gravely loam; massive; hard when dry, friable when moist; <br />medium acid. <br />11 to 29 inches – reddish-brown clay; strong prismatic structure; extremely hard when <br />dry, extremely firm when moist, very plastic and sticky when wet; medium acid in <br />upper part and mildly alkaline in lower part. <br />29 to 54 inches – brown heavy loam; strong medium, blocky structure; very hard when <br />dry, firm when moist, sticky and plastic when wet; moderately alkaline. <br />54+ inches – light yellowish-brown gravely sandy clay loam; massive; slightly hard