1815 HOLBROOK AVE 2025-03-06 - Laserfiche WebLink

Snohomish County Area, Washington 26—Indianola loamy sand, 15 to 30 percent slopes Map Unit Setting • National map unit symbol: 2t639 • Elevation: 0 to 980 feet • Mean annual precipitation: 30 to 81 inches • Mean annual air temperature: 48 to 50 degrees F • Frost-free period: 170 to 210 days • Farmland classification: Farmland of statewide importance Map Unit Composition • Indianola and similar soils: 85 percent • Minor components: 15 percent • Estimates are based on observations, descriptions, and transects of the mapunit. Description of Indianola Setting • Landform: Terraces, kames, eskers • Landform position (two-dimensional): Backslope • Landform position (three-dimensional): Side slope • Down-slope shape: Linear • Across-slope shape: Linear • Parent material: Sandy glacial outwash Typical profile • Oi - 0 to 1 inches: slightly decomposed plant material • A - 1 to 6 inches: loamy sand • Bw1 - 6 to 17 inches: loamy sand • Bw2 - 17 to 27 inches: sand • BC - 27 to 37 inches: sand • C - 37 to 60 inches: sand Properties and qualities • Slope: 15 to 30 percent • Depth to restrictive feature: More than 80 inches • Drainage class: Somewhat excessively drained • Capacity of the most limiting layer to transmit water(Ksat): High to very high (5.95 to 99.90 in/hr) • Depth to water table: More than 80 inches • Frequency of flooding: None • Frequency of ponding: None • Available water supply, 0 to 60 inches: Low (about 3.9 inches) Interpretive groups • Land capability classification (irrigated): 6e • Land capability classification (nonirrigated): 4e • Hydrologic Soil Group: A • Ecological site: F002XA004WA - Puget Lowlands Forest Insight Engineering Co. -Stormwater Site Plan 6/22/2022 - 10-