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Appendix A— Hydraulic Analysis <br /> Total Site Area= 0.53 Acres <br /> Study Area(Building Footprint) = 0.43 Acres <br /> Per NRCS survey of Snohomish County, the site contains Alderwood Soils that has a <br /> hydrologic classification of"C". <br /> Existing Conditions: <br /> Pervious area (Pasture) = 0.43 Acres (18,608 SF) <br /> Refer to the Existing Basin Map attached later in this section for more details. <br /> Developed Conditions: <br /> Impervious area: <br /> Roof area = 0.40 Acres (17,340 SF) <br /> Driveway = 0.02 Acres (1,060 SF) <br /> Sidewalk = 0.01 Acres (208 SF) <br /> Total Impervious = 0.43 Acres (18,608 SF) <br /> Refer to the Developed Basin Map attached later in this section for more details. <br /> Detention Volume Required:7,880 CF. <br /> Detention Volume Provided:7,880 CF. <br /> A Storm tank system of equivalent area and depth of 3 ft will be provided. <br /> The Storm tank system will have ST-36 tanks for a total depth of 3-feet and a 1 ft stone <br /> storage around the storm tank. Storm tank will provide a total volume of 7,880 CF. <br /> Insight Engineering Co. -Stormwater Site Plan 09/10/18 <br /> - 19- <br />