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1 . PROJECT OVERVIEW <br /> This document is intended to provide engineering information necessary to support the <br /> SFR building permit application to the City of Everett for this property. The site is located <br /> at 9509 7th Ave SE, Everett, WA 98208, refer to figure 1 for a vicinity map. The parcel <br /> area is approximately 0.40 acres. The parcel is bordered to the north by 95th Ct SE and to <br /> the west by 7th Ave SE, and the new SFR will take access off of the existing driveway cut <br /> located near the northeast corner of the property off of 95th Ct SE. The new SFR will be <br /> located 15-feet west of the eastern property line near the existing SFR location. <br /> This project proposes to construct less than 3,400 sf of new impervious surfaces while <br /> removing the existing SFR and some of the existing driveway. Since this parcel is less <br /> than 1 acre in size per the COE 2010 stormwater manual the existing conditions will be <br /> modeled as they are in the current/developed condition. Therefore, Minimum <br /> requirements 1-5 apply to all of the new impervious surfaces for this project along with all <br /> the disturbed pervious surfaces. This proposal does not meet any of the land-use criteria <br /> that require specific source control for the final use and a SWPPP has been prepared to <br /> address the runoff from the site during construction. Refer to Sections 4 and 5 for a <br /> detailed discussion. <br /> Figures 2 & 3 are provided to show the existing and developed basins and runoff <br /> conditions for this site. The runoff in the existing condition will spread over the pervious <br /> and impervious surfaces as sheet flow and drain to the northeast. With all of the site <br /> runoff being collected in the 95th Ct SE roadway to the north of the property. The runoff <br /> within the roadway drains to the east and is collected approximately 50-feet east of the site <br /> by a catch basin which conveys the runoff further east in a pipe conveyance system. <br /> The general soil conditions for this property as mapped by the NCSC web-soil survey were <br /> found to be Alderwood-Urban Land Complex type soils. Therefore, dispersion and shallow <br /> infiltration will be used and sized based on the Alderwood type soils he found on the site. <br /> The drainage design has been laid out per the COE 2010 Stormwater Management <br /> Manual. <br /> Due to the size of this project only Minimum requirements 1-5 apply to the proposed <br /> drainage design as noted above. Included on the following page is a copy of the MR flow <br /> chart out of the COE Drainage Manual showing how the applicable minimum requirements <br /> were determined. <br /> Fordham SFR 12-0906 <br /> Oct. 2012 Page 3 <br />