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Custom Soil Resource Report <br />San Joaquin County, California <br />130—Columbia fine sandy loam, drained, 0 to 2 percent slopes, MLRA <br />17 <br />Map Unit Setting <br />National map unit symbol. 2xidl <br />Elevation: 10 to 130 feet <br />Mean annual precipitation: 14 to 19 inches <br />Mean annual air temperature: 61 to 62 degrees F <br />Frost -free period: 318 to 328 days <br />Farmland classification: Prime farmland if irrigated <br />Map Unit Composition <br />Columbia 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 Columbia <br />Setting <br />Landform: Flood plains <br />Landform position (three-dimensional): Tread <br />Down-slope shape: Linear <br />Across -slope shape: Linear <br />Parent material: Alluvium derived from igneous, metamorphic and sedimentary <br />rock <br />Typical profile <br />Ap - 0 to 4 inches: fine sandy loam <br />A - 4 to 12 inches: fine sandy loam <br />C1 - 12 to 21 inches: silt loam <br />C2 - 21 to 26 inches: fine sandy loam <br />C3 - 26 to 34 inches: silt loam <br />C4 - 34 to 40 inches: loamy fine sand <br />C5 - 40 to 48 inches: fine sandy loam <br />C6 - 48 to 60 inches: loamy fine sand <br />Properties and qualities <br />Slope: 0 to 4 percent <br />Depth to restrictive feature: More than 80 inches <br />Drainage class: Somewhat poorly drained <br />Runoff class: Low <br />Capacity of the most limiting layer to transmit water (Ksat): Moderately low (0.01 to <br />0.14 in/hr) <br />Depth to water table: About 72 inches <br />Frequency of flooding: RareNone <br />Frequency of ponding: None <br />Maximum salinity: Nonsaline (0.0 to 1.0 mmhos/cm) <br />Sodium adsorption ratio, maximum: 1.0 <br />Available water supply, 0 to 60 inches: High (about 11.8 inches) <br />Interpretive groups <br />Land capability classification (irrigated): 2s <br />Land capability classification (nonirrigated): 4s <br />13 <br />