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Map Unit Description:Alderwood-Urban land complex,2 to 8 percent slopes— Everett Matson <br /> Snohomish County Area,Washington <br /> Snohomish County Area, Washington <br /> 5—Alderwood-Urban land complex, 2 to 8 percent slopes <br /> Map Unit Setting <br /> Elevation: 50 to 800 feet <br /> Mean annual precipitation:25 to 60 inches <br /> Mean annual air temperature:48 to 52 degrees F <br /> Frost-free period: 180 to 220 days <br /> Map Unit Composition <br /> Alderwood and similar soils:60 percent <br /> Urban land:25 percent <br /> Minor components:6 percent <br /> Description of Alderwood <br /> Setting <br /> Landform:Till plains <br /> Parent material: Basal till <br /> Properties and qualities <br /> Slope:2 to 8 percent <br /> Depth to restrictive feature:20 to 40 inches to dense material <br /> Drainage class: Moderately well drained <br /> Capacity of the most limiting layer to transmit water(Ksat):Very low <br /> to moderately low(0.00 to 0.06 in/hr) <br /> Depth to water table:About 18 to 36 inches <br /> Frequency of flooding: None <br /> Frequency of ponding: None <br /> Available water capacity: Low(about 3.0 inches) <br /> Interpretive groups <br /> Land capability(nonirrigated):4s <br /> Typical profile <br /> 0 to 7 inches: Gravelly sandy loam <br /> 7 to 35 inches:Very gravelly sandy loam <br /> 35 to 60 inches: Gravelly sandy loam <br /> Minor Components <br /> Mckenna <br /> Percent of map unit:2 percent <br /> Landform: Depressions <br /> Norma <br /> Percent of map unit:2 percent <br /> Landform: Depressions <br /> Terric medisaprists <br /> Percent of map unit:2 percent <br /> USDA Natural Resources Web Soil Survey 4/2/2012 <br /> Conservation Service National Cooperative Soil Survey Page 1 of 2 <br />