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San Joaquin County, California <br />118—Capay clay, 0 to 1 percent slopes, MLRA 17 <br />Map Unit Setting <br />National map unit symbol: 2xc8q <br />Elevation: 20 to 350 feet <br />Mean annual precipitation: 10 to 13 inches <br />Mean annual air temperature: 61 to 63 degrees F <br />Frost-free period: 318 to 337 days <br />Farmland classification: Prime farmland if irrigated <br />Map Unit Composition <br />Capay 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 Capay <br />Setting <br />Landform: Basin floors <br />Landform position (two-dimensional): Toeslope <br />Landform position (three-dimensional): Tread <br />Down-slope shape: Linear <br />Across-slope shape: Linear <br />Parent material: Clayey alluvium derived from sedimentary rock <br />Typical profile <br />Ap - 0 to 11 inches: clay <br />A - 11 to 20 inches: clay <br />Bss1 - 20 to 30 inches: clay <br />Bss2 - 30 to 39 inches: clay <br />Bk1 - 39 to 51 inches: clay <br />Bk2 - 51 to 60 inches: clay <br />Properties and qualities <br />Slope: 0 to 2 percent <br />Depth to restrictive feature: More than 80 inches <br />Natural drainage class: Moderately well drained <br />Runoff class: High <br />Capacity of the most limiting layer to transmit water (Ksat): <br />Moderately low to moderately high (0.06 to 0.20 in/hr) <br />Depth to water table: More than 80 inches <br />Frequency of flooding: None <br />Frequency of ponding: Frequent <br />Calcium carbonate, maximum in profile: 1 percent <br />Gypsum, maximum in profile: 1 percent <br />Salinity, maximum in profile: Nonsaline to very slightly saline (0.2 <br />to 2.0 mmhos/cm) <br />Sodium adsorption ratio, maximum in profile: 3.0 <br />Available water storage in profile: Moderate (about 9.0 inches) <br />Map Unit Description: Capay clay, 0 to 1 percent slopes, MLRA 17---San Joaquin County, <br />California <br />Natural Resources <br />Conservation Service <br />Web Soil Survey <br />National Cooperative Soil Survey <br />2/5/2019 <br />Page 1 of 2