3214 BROADWAY BROADWAY KINECT APARTMENTS 2021-08-11

• • • ` • • E. Stormwater Treatment Plan The apartment building will extend to the property line on all sides;the roof will cover the building except • for a small courtyard area on the east side of the site that will have a sidewalk and landscaping.Vehicles • will not be allowed in the area. The site will be non-pollution generating therefore treatment is not • required because all of the stormwater entering the system is entirely from the roof.See Minimum Requirement#6 of the 2010 City of Everett Stormwater Management Manual. • • F. Conveyance Analysis: Storm water on the site from the roof will be conveyed through pvc pipes(n=0.010)to the detention vault • through roof downspout drains. The stormwater will be conveyed from the detention vault to the • manhole in Broadway Avenue through an 8"storm pipe and a 12"combination storm and sewer pipe at 1.50 percent.The stormwater system was sized to convey the 25-year recurrence interval peak flow per • Chapter 6 of Volume 1 of the 2010 City of Everett Stormwater Management Manual.The 25-year event • peak flow is 0.329 cfs,where the full-flow capacity of an 8" pipe is 1.92 cfs.See Appendix 4 for the pipe • capacities. • a Maintenance and Operation Plan • Operation and Maintenance checklists are included in Appendix 7.The owner shall complete checklists for • all systems applicable on the schedule indicated on the checklists. Use photocopies of these checklists to indicate items that need to be addressed.The checked sheets shall be kept by the property owner at the • property and made available to the city upon request. • • END OF STORMWATER SITE PLAN • • • • • • • • • • • • • • a a • • • • • Broadway Apartments 9 of 9 Stormwater Site Plan a •