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Custom Soil Resource Report <br />San Joaquin County, California <br />238—San Joaquin loam, 0 to 2 percent slopes <br />Map Unit Setting <br />National map unit symbol: hhwf <br />Elevation: 20 to 110 feet <br />Mean annual precipitation: 16 inches <br />Mean annual air temperature: 61 degrees F <br />Frost -free period: 275 days <br />Farmland classification: Not prime farmland <br />Map Unit Composition <br />San Joaquin 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 San Joaquin <br />Setting <br />Landform: Terraces <br />Landform position (two-dimensional): Shoulder <br />Landform position (three-dimensional): Tread <br />Down-slope shape: Linear <br />Across -slope shape: Linear <br />Parent material: Alluvium derived from granitic rock sources <br />Typical profile <br />Ap - 0 to 16 inches: loam <br />2Bt - 16 to 26 inches: clay <br />2Bgm - 26 to 60 inches: indurated <br />Properties and qualities <br />Slope: 0 to 2 percent <br />Depth to restrictive feature: More than 80 inches; 20 to 40 inches to duripan <br />Drainage class: Moderately well drained <br />Runoff class: Very high <br />Capacity of the most limiting layer to transmit water (Ksat): Very low (0.00 in/hr) <br />Depth to water table: More than 80 inches <br />Frequency of flooding: None <br />Frequency of ponding: None <br />Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) <br />Available water capacity: Very low (about 2.4 inches) <br />Interpretive groups <br />Land capability classification (irrigated): 4s <br />Land capability classification (nonirrigated): 4s <br />Hydrologic Soil Group: D <br />Ecological site: R017XE104CA - LOAMY CLAYPAN <br />Hydric soil rating: No <br />Minor Components <br />Galt <br />Percent of map unit: 3 percent <br />Landform: Depressions <br />13 <br />