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Custom Soil Resource Report <br />San Joaquin County, California <br />250—Stockton clay, 0 to 2 percent slopes <br />Map Unit Setting <br />National map unit symbol: hhwt <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: Prime farmland if irrigated <br />Map Unit Composition <br />Stockton and similar soils: 85 percent <br />Minor components: 15 percent <br />Estimates are based on observations, descriptions, and transects of the mapunit. <br />Description of Stockton <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 29 inches: clay <br />Bk1 - 29 to 37 inches: clay <br />Bk2 - 37 to 42 inches: clay loam <br />Bkqm - 42 to 60 inches: cemented <br />Properties and qualities <br />Slope: 0 to 2 percent <br />Depth to restrictive feature: 40 to 60 inches to duripan <br />Drainage class: Somewhat poorly drained <br />Runoff class: High <br />Capacity of the most limiting layer to transmit water (Ksat): Very low (0.00 in/hr) <br />Depth to water table: About 60 inches <br />Frequency of flooding: Rare <br />Frequency of ponding: None <br />Calcium carbonate, maximum content: 10 percent <br />Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) <br />Available water supply, 0 to 60 inches: Moderate (about 6.4 inches) <br />Interpretive groups <br />Land capability classification (irrigated): 2s <br />Land capability classification (nonirrigated): 4s <br />Hydrologic Soil Group: C <br />Ecological site: R017XY901 CA - Clayey Basin Group <br />Hydric soil rating: No <br />13 <br />