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Map Unit Description:Altvan fine sandy loam,0 to 6 percent slopes---Weld County,Colorado, <br /> Northern Part <br /> Weld County, Colorado, Northern Part <br /> 1—Altvan fine sandy loam, 0 to 6 percent slopes <br /> Map Unit Setting <br /> Elevation: 3,500 to 5,500 feet <br /> Mean annual precipitation: 14 to 16 inches <br /> Mean annual air temperature:46 to 48 degrees F <br /> Frost-free period: 130 to 150 days <br /> Map Unit Composition <br /> Altvan and similar soils: 85 percent <br /> Minor components: 15 percent <br /> Description of Altvan <br /> Setting <br /> Landform: Plains <br /> Down-slope shape: Linear <br /> Across-slope shape: Linear <br /> Parent material: Calcareous gravelly alluvium <br /> Properties and qualities <br /> Slope: 0 to 6 percent <br /> Depth to restrictive feature:20 to 40 inches to strongly contrasting <br /> textural stratification <br /> Drainage class:Well drained <br /> Capacity of the most limiting layer to transmit water <br /> (Ksat): Moderately high to high (0.20 to 2.00 in/hr) <br /> Depth to water table: More than 80 inches <br /> Frequency of flooding: None <br /> Frequency of ponding: None <br /> Calcium carbonate, maximum content: 15 percent <br /> Available water capacity: Low(about 4.6 inches) <br /> Interpretive groups <br /> Farmland classification: Farmland of statewide importance <br /> Land capability classification (irrigated): 3e <br /> Land capability(nonirrigated):4e <br /> Hydrologic Soil Group: B <br /> Ecological site: Loamy Plains (R067BY002CO) <br /> Typical profile <br /> 0 to 6 inches: Fine sandy loam <br /> 6 to 22 inches: Sandy clay loam <br /> 22 to 27 inches: Sandy clay loam <br /> 27 to 60 inches: Gravelly coarse sand <br /> Minor Components <br /> Ascalon <br /> Percent of map unit: 5 percent <br /> USDA Natural Resources Web Sod Survey 11/20/2013 <br /> Conservation Service National Cooperative Soil Survey Page 1 of 2 <br />