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Everett LDS Parking Lot Expansion <br />Storm Drainage Report <br />The soil hydrologic types for this site have been identified as Type C from the Snohomish County <br />Soil Survey Map. This soil. an Alderwood Urban Complex is further described below. <br />5—Aiderwood-Urban iz nd 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 percen: <br />• Minor components: 6 l ercr.nt <br />Description of Alderwood <br />Settin <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: Maierately well drained <br />C: N,jew & Pt-e Datu1200606113 Everett LDS Pme N L061e. to Re ns166113 CM ron <br />d Ev -LDS orw"e Rer.Ex Page 4 of 36 <br />