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2. EXISTING CONDITIONS SUMMARY <br /> The site covers approximately 0.39 acres. The proposed disturbance area of the existing, <br /> pre 1997 site contains landscaping, at least two buildings, a paved/gravel driveway and <br /> trees spread out throughout the property. All pre 1997 structures have been removed from <br /> the site sometime between 7/1/05 and 7/1/06. Therefore, not all of the proposed roof <br /> surfaces will be considered new NPGIS. The surface area of the pre 1997 buildings <br /> totaled approximately 2,484 sf. The roof surface area of the 4 proposed units totals <br /> approximately 5,661 sf resulting in a net increase of roof surface area of approximately <br /> 3,177 sf(0.07 ac). The total impervious surfaces of the pre 1997 site was approximately <br /> 6,300 sf. The proposed impervious surfaces of all 4 units totals 8318 sf. Approximately <br /> 2,018 sf (0.04 ac) of the entire site will be impacted by new impervious surfaces with <br /> approximately 0.39 acres of the site being disturbed as needed for the clearing/grubbing <br /> and restoration of the existing site. <br /> The proposed area of disturbance is the entire parcel. The site drains to the west. The <br /> existing roads to the north and west do not drain toward this property. This project will not <br /> affect any offsite flows from passing through the site as in the existing condition. All runoff <br /> from the proposed developed portion of this site will also be dispersed and leave as sheet <br /> flow, be infiltrated below grade in the on-site swales or be collected by the on-site yard <br /> drains and conveyed off-site by storm drains. <br /> Since this parcel has been cleared and graded previously the NCSC web-soil survey was <br /> used to determine the existing soil conditions for the 4 units on the project parcel. Refer <br /> to Figure 4. The soils are mapped as Alderwood-Urban Land Complex. The general site <br /> slopes, in all 4 areas of disturbance, are flat and do not exceed 2 percent. Based on the <br /> existing soil information and the setbacks of the proposed improvements from any of the <br /> property lines or critical areas there is little potential for erosion or sedimentation during <br /> construction, assuming the basic BMPs included in the SWPPP are installed and <br /> maintained properly. Refer to Figure 2 for an existing basin map. <br /> OLYMPIC TERRACE CONDOS 13-0605 <br /> June 2013 Page 4 <br />