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MR #5: On-Site Stormwater Management All projects meeting the thresholds for this Small Project Stormwater Report shall employ on-site stormwater management BMPs to infiltrate, disperse and retain stormwater runoff on-site to the extent feasible without causing flooding or erosion impacts on-site or downstream. Task 1: Determine whether infiltration has been pre-determined to be infeasible for any portion of your project site. c3 • Review the infiltration infeasibility mapping tool available on"Map Everett" everettwa.gov/mapeverett. • On the mapping tool, select"Geotechnical/Infiltration Infeasibility Area"and the applicable"Property" layers from the Layer List. • Zoom into your project site and print the resulting map to show the project site boundaries and the infiltration infeasibility mapping results. • Areas mapped as red have been pre-determined to be infeasible for infiltration. • Areas mapped as green are potentially feasible for infiltration and must be assessed further for infiltration feasibility,as discussed further below. 0 • Attach a printed copy of the map clearly showing your project site boundary and the infiltration infeasibility mapping results. Task 2: Determine whether the project is flow control exempt. How do I know if my project is flow control exempt? Your project is flow control exempt if 1) your project discharges directly to the Puget Sound or Snohomish River,or 2)your project discharges to a stormwater system entirely man-made from the site to either of those water bodies, although subject to the following:the project will reduce discharge rates to an existing stream or wetland, or the conveyance system has adequate capacity to accommodate increased flows without flooding or causing erosion. See Ecology SWMMWW Volume 1 for more information on flow control exempt criteria. 0 Select one of the boxes below: ❑ Project is not flow control exempt and List#1 will be used to satisfy MR#5(Go to page 18). • Project is flow control exempt and List#3 will be used to satisfy MR#5(Go to page 19). City of Everett Public Works Small Project Stormwater Site Plan Report-Dec 2019 17