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• Custom Soil Resource Report Snohomish County Area, Washington 3—Alderwood gravelly sandy loam, 15 to 30 percent slopes Map Unit Setting National map unit symbol: 2t627 Elevation: 0 to 1,000 feet Mean annual precipitation: 25 to 60 inches Mean annual air temperature: 46 to 52 degrees F Frost-free period: 160 to 240 days Farmland classification: Farmland of statewide importance Map Unit Composition Alderwood and similar soils:85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Alderwood Setting Landform: Ridges, hills Landform position(two-dimensional): Backslope Landform position(three-dimensional):Side slope, nose slope,talf Down-slope shape: Linear, convex Across-slope shape:Convex Parent material:Glacial drift and/or glacial outwash over dense glaciomarine deposits Typical profile A-0 to 7 inches: gravelly sandy loam Bw1 - 7 to 21 inches: very gravelly sandy loam Bw2-21 to 30 inches: very gravelly sandy loam Bg-30 to 35 inches: very gravelly sandy loam 2Cd1 -35 to 43 inc : ry ally sndy loam 2Cd2-43 to 59 inches:hes vevery gravelly sandy loam Properties and qualities Slope: 15 to 30 percent Depth to restrictive feature:20gr to 39ve inchesa to densic material Drainage class: Moderately well drained Capacity of the most limiting layer to transmit water(Ksat):Very low to moderately low(0.00 to 0.06 in/hr) Depth to water table:About 18 to 37 inches Frequency of flooding: None Frequency of ponding:None Available water capacity:Very low(about 2.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Forage suitability group: Limited Depth Soils(G002XF303WA), Limited Depth Soils (G002XN302WA), Limited Depth Soils(G002XS301 WA) Other vegetative classification: Limited Depth Soils (G002XF303WA), Limited Depth Soils(G002XN302WA), Limited Depth Soils(G002XS301 WA) 13