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DETENTION ANALYSIS <br /> Per NRCS survey of Snohomish County, the project site contains Alderwood soils that <br /> have a hydrologic classification of Type "C". <br /> I <br /> Total Site Area = 1.88 Acres (82,113 SF) <br /> Wetland Area(-) =0.77 Acres (34683 SF) <br /> Total Area Included in the Analysis = 1.11 Acres (48,269 SF) <br /> Existing Basin Summary <br /> Total Area Included in the Analysis = 1.11 Acres <br /> Total Existing Basin Area = 1.11 Acres <br /> The entire existing basin was modeled as forested areas. <br /> Refer to the Existing Basin Map for basin representation. <br /> I <br /> Developed Basin Summary <br /> Total Area Included in the Analysis = 1.11 Acres <br /> Bypass Area(-) =0.03 Acres <br /> Total Developed Basin Area = 1.08 Acres <br /> Impervious Areas: <br /> Sidewalk = 2,536 SF (0.06 Acres) <br /> Parking lot with curb = 33,983 SF (0.78 Acres) <br /> Total Impervious =36,519 SF (0.84 Acres) <br /> I <br /> Total Pervious Areas = 1.08-0.84=0.24 Acres <br /> 1 Detention Volume Required: 17,994 CF <br /> Detention Volume Provided: 18,006 CF <br /> I <br /> Insight Engineering Co. -Stormwater Site Plan 12/20/2018 <br /> -23 - <br /> I <br />