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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 />2Bkqm - 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 />Land capability classification (irrigated): 3s <br />Map Unit Description: Jacktone clay, 0 to 2 percent slopes---San Joaquin County, California <br />Natural Resources <br />Conservation Service <br />Web Soil Survey <br />National Cooperative Soil Survey <br />10/22/2019 <br />Page 1 of 2