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San Joaquin County, California <br /> 180—Jacktone clay, 0 to 2 percent slopes <br /> Map Unit Setting <br /> National map unit symbol: hhtk <br /> Elevation: 0 to 100 feet <br /> Mean annual precipitation: 14 inches <br /> Mean annual air temperature: 61 degrees F <br /> Frost-free period. 270 days <br /> Farmland classification: Farmland of statewide importance <br /> Map Unit Composition <br /> Jacktone and similar soils: 85 percent <br /> Minor components. 15 percent <br /> Estimates are based on observations, descriptions, and transects of <br /> the mapunit. <br /> Description of Jacktone <br /> Setting <br /> Landform: Basin floors <br /> Landform position (two-dimensional): Toeslope <br /> Landform position (three-dimensional): Talf <br /> Down-slope shape: Linear <br /> Across-slope shape: Linear <br /> Parent material. Alluvium derived from mixed rock sources <br /> Typical profile <br /> A - 0 to 22 inches: clay <br /> Bk- 22 to 34 inches: clay <br /> 2Bkgm - 34 to 37 inches: indurated <br /> 2Bk- 37 to 46 inches: stratified sandy loam to clay loam <br /> 3Bkq-46 to 60 inches. cemented <br /> Properties and qualities <br /> Slope: 0 to 2 percent <br /> Depth to restrictive feature. 20 to 40 inches to duripan <br /> Natural drainage class: Somewhat poorly drained <br /> Runoff class: High <br /> Capacity of the most limiting layer to transmit water(Ksat). Very <br /> low (0.00 in/hr) <br /> Depth to water table: About 0 inches <br /> Frequency of flooding: Rare <br /> Frequency of ponding. None <br /> Calcium carbonate, maximum in profile: 10 percent <br /> Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 <br /> to 2.0 mmhos/cm) <br /> Available water storage in profile: Low (about 5.1 inches) <br /> Interpretive groups <br /> I I 1 .1.1 1 , , 1 11 n <br />