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BMP 12.40: Raingardens <br /> Implementing Raingardens into a roadway design requires additional right of way for depressed median or <br /> edge planters. The right-of-way available for Eighth Street is not wide enough to support raingardens. <br /> Additionally, Riverside Road (N-S) and Riverside Road (E-W) have an existing traditional drainage system that <br /> does not allow for a raingarden retrofit. <br /> BMP 12.50: Downspout Dispersion Systems <br /> The project is not proposing any buildings;therefore, BMP 12.50 is not applicable. <br /> BMP 12.60: Concentrated Flow Dispersion <br /> The drainage scheme, topography, and limited right-of-way do not allow for the required flat area needed to <br /> properly disperse concentrated flow from the project. Additionally, as all Eighth Street runoff is directed to the <br /> existing Stormwater Quality Pond 2 via the Riverside Road (N-S) pumped storm drain system,there is no <br /> opportunity to disperse the site's runoff. <br /> BMP 12.70: Sheet Flow Dispersion <br /> As the required Eighth Street section and the existing Riverside Road section include curb and gutter with <br /> storm drain catch basins and pipes, it is not possible to sheet flow runoff from the site onto adjacent <br /> vegetated strips. <br /> See Appendix A for development plans showing the proposed improvements. <br /> 4. Construction Storm Water Pollution Prevention Plan <br /> Below are listed applicable runoff conveyance and treatment BMPs the 2010 City of Everett Stormwater <br /> Management Manual: <br /> BMP C209: Outlet Protection <br /> Prevents scour at conveyance outlets and minimizes the potential for downstream erosion by reducing the <br /> velocity of concentrated stormwater flows. <br /> BMP C220: Storm Drain Inlet Protection <br /> Prevents coarse sediment from entering drainage systems prior to permanent stabilization of the disturbed <br /> area. <br /> BMP C209: Silt Fence <br /> Reduces transport of coarse sediment from a construction site by providing a temporary physical barrier to <br /> sediment and reducing the runoff velocities of overland flow. <br /> Additional information on these BMPs can be found in the Construction Stormwater Pollution Prevention Plan <br /> in Appendix B of this report. <br /> 5. Source Control Plan <br /> Below are listed applicable source control BMPs per the 2010 City of Everett Stormwater Management <br /> Manual: <br /> Riverside Business Park—Public Access Trails and Roadway Improvements <br /> 3 <br />