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MR #4: Preservation of Natural Drainage Systems <br /> Natural drainage patterns shall be maintained,and dischargesfromthe project site shaII occur at the <br /> natural location.This MR has two main components: 1)maintain the natural on-site drainage pattern (if <br /> there is a concentrated discharge location at the downstream propertyboundary, it shall not be moved) <br /> and 2)prevent erosion at the discharge point and downstream of the discharge locations. This MR <br /> includes maintaining or replacing systems which convey runoff across the site from upstream areas.All <br /> outfalls require energy dissipation. <br /> 0•d Step 4.1: Document existing and proposed drainage patterns and discharges. <br /> (Check the boxes that apply and provide descriptions when requested.) <br /> ❑ This site has existing drainage systems or outfalls as shown on the Stormwater Site <br /> Plan provided in MR#1. <br /> ❑ This project will not alter the existing drainage system in any way. If the existing <br /> outfall(s) show sign of erosion and scour, energy dissipation measures will be installed <br /> or improved upon. Construction activity of any kind will not occur within at least 10 <br /> feet from the edge of the channelized flow. BMP C102: Buffer Zones will be <br /> implemented during the life of the project to include visible flagging or another <br /> demarcation technique. If this requirement is not met a Hydraulic Project Approval <br /> (HPA) may be required from the Washington Department of Fish and Wildlife (WDFW). <br /> El The site does not have any existing drainage systems or outfalls. <br /> Describe how stormwater will be discharged from the site without causing erosion or <br /> flooding downstream: <br /> The proposed road will be graded so that it sheet flows into existing vegetation for Full <br /> Dispersion <br /> ❑ The existing concentrated drainage system traversing the property will be impacted as <br /> part of this project and is shown on the Stormwater Site Plan provided in MR#1. <br /> Describe how your project impacts or changes the existing drainage systems and how <br /> you will address it: <br /> 0 Step 4.2: Select where the project will discharge its stormwater. <br /> ❑ City's drainage system <br /> ❑ Outlet protection such as a rip-rap pad <br /> 0 Dispersion trench or other dispersion facility <br /> ❑ Piped conveyance to an appropriate discharge location with easement if required <br /> 0 Other: Stormwater will either infiltrate or disperse into existing vegetation <br /> City of Everett Public Works <br /> Small Project Stormwater Site Plan/Report—Sept.2023 Page 20 of 40 <br />