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DETENTION ANALYSIS <br /> Total Site Area= 5.00 Acres <br /> Onsite Area included in the Analysis =2.44 Acres <br /> Frontage Improvements =0.04 Acres <br /> Total Area Included in the Analysis =2.48 Acres <br /> Per NRCS survey of Snohomish County, the project site contains Alderwood Urban Land <br /> Complex 0 to 8 percent soils that have a hydrologic classification of Type "C" and Everett <br /> soil that have a hydrologic classification of Type "A" <br /> Existing Conditions: • <br /> Total Area Included in the Analysis =2.48 Acres <br /> Existing Basin Area =2.48 Acres <br /> Existing Impervious Area: <br /> Existing Road =0.02 Acres (919 SF) <br /> Total Impervious = 0.02 Acres (919 SF) <br /> Pervious area=2.48 Acres-0.02 Acres=2.46 Acres <br /> The entire pervious area was modelled as forested. Within the detention basin, "areas of <br /> till soils" is 2.31 Acres and the "Recessional outwash"area is 0.15 Acres. This adds up to <br /> 2.46 Acres. <br /> Refer to the Existing Basin Map attached later in this section for more details. <br /> Developed Conditions: <br /> Total Area Included in the Analysis =2.48 Acres <br /> Developed Basin Area =2.48 Acres <br /> Developed Impervious Area: <br /> Sidewalk =0.05 Acres ( 2,210 SF) <br /> Roof area* =0.73 Acres (32,000 SF) <br /> Road =0.42 Acres (18,166 SF) <br /> Existing Road =0.02 Acres ( 919 SF) <br /> Total Impervious = 1.22 Acres (53,295 SF) <br /> Pervious area=2.48 Acres— 1.22 Acres= 1.21 Acres <br /> Insight Engineering Co. -Stormwater Site Plan 07/03/2019 <br /> -28 - <br />