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Custom Soil Resource Report <br /> 261—Valdez silt loam, organic substratum, partially drained, 0 to 2 <br /> percent slopes, MLRA 16 <br /> Map Unit Setting <br /> National map unit symbol: 2x4kv <br /> Elevation: -10 to 20 feet <br /> Mean annual precipitation: 13 to 18 inches <br /> Mean annual air temperature: 60 to 62 degrees F <br /> Frost-free period. 270 to 300 days <br /> Farmland classification: Prime farmland if irrigated <br /> Map Unit Composition <br /> Valdez, organic substratum, partially drained, 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 Valdez, Organic Substratum, Partially Drained <br /> Setting <br /> Landform: Deltas, flood plains <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:Alluvium derived from mixed rock sources, and herbaceous <br /> organic material from reeds and tules <br /> Typical profile <br /> Ap-0 to 14 inches: silt loam <br /> Cg- 14 to 40 inches: silty clay loam <br /> 2Ab-40 to 50 inches: mucky silt loam <br /> 30e-50 to 79 inches: mucky peat <br /> Properties and qualities <br /> Slope: 0 to 2 percent <br /> Depth to restrictive feature: More than 80 inches <br /> Drainage class: Poorly drained <br /> Runoff class: High <br /> Capacity of the most limiting layer to transmit water(Ksat). Moderately high (0.20 <br /> to 0.57 in/hr) <br /> Depth to water table:About 36 to 48 inches <br /> Frequency of flooding: RareNone <br /> Frequency of ponding: None <br /> Maximum salinity: Nonsaline to slightly saline(0.0 to 4.0 mmhos/cm) <br /> Sodium adsorption ratio, maximum:2.0 <br /> Available water supply, 0 to 60 inches: High (about 11.4 inches) <br /> Interpretive groups <br /> Land capability classification (irrigated): 3w <br /> Land capability classification (nonirrigated): 4w <br /> 19 <br />