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1. PROJECT OVERVIEW <br />This, document is intended to provide engineering information necessary to support the <br />building permit application to the City of Everett for the proposed SFR and driveway <br />proposed,.on:Ibis-lot..The site -is located .at 5230 East Drive, Everett,WA 98203; refer to <br />Figure 1 for a vicinity map. This project will take.access from the existing shared driveway <br />to the east that takes 'access from East Drive. The parcel area is approximately 0.16 <br />acres. The existing site, in the area of disturbance consists of lawn. The slope of the site, <br />in the area of disturbance, is moderate and averages approximately 20 percent in the area <br />of the proposed driveway and 10 percent in the.area of the, proposed SFR, with steep <br />slopes that begin at the western property line. The new SFR will be located approximately <br />5 feet from the northern .property line and 34 feet from the eastern property line. <br />This project proposes to construct more than 2,000 sf and less than 5,000 sf of new and <br />replaced impervious surfaces. Therefore, Minimum Requirements 1-5 apply to all of the <br />new and replaced impervious surfaces for this project along with all the converted <br />vegetated areas. The proposed impervious surfaces will either be infiltrated on -site or <br />tightlined to an existing storm system. via a perforated stubout connection. Included on the <br />following page is a copy of the MR flow chart from the '2019 Department of Ecology. <br />Stormwater Management Manual for Western Washington (DOE SWMMWVV). <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 conditions sheet flows gradually over <br />vegetated surfaces to the north/northwest toward the northwestern' property lines and <br />steep slopes just off -site. <br />Due to the size of this project, Minimum Requirements 1-5 apply to the proposed drainage <br />design as noted above. The stormwater design has been laid out to meet the 2019 DOE <br />SWMMVVW. <br />Moir SP Lot 4 20-0230 <br />February 2020 <br />Revised October 2020 Page 3 <br />