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B.Rf Services <br /> An Engineering Company <br /> SMM Gardens <br /> 19-016 <br /> 1-2.5.5 Minimum Requirement #5:On-site Stormwater Management <br /> Per the City of Everett Stormwater Management Manual,the site shall be the most recent Washington <br /> State Department of Ecology Stormwater Management Manual for Western Washington. <br /> Ex. Undeveloped Pervious Area 106,294 sf w/playfield 2.44 Ac <br /> 29,882 sf=0.69 Ac development area. <br /> The 0.69 ac development area is forested with moderate slopes within Church Grounds located at the <br /> southeast corner of the site that includes a ball field. <br /> The proposed walkway and statuary area in the undeveloped area of 0.69 Ac. <br /> The proposed statuary and walkway 0.17 Ac of none-pollution generating surface will not remove any <br /> trees for their placement.The proposed sidewalk is considered none-effective impervious surface based <br /> on BMP T5.18. <br /> All disturbed areas will have a minimum 10"Topsoil per BMP T5.13: Post-Construction Soil Quality and <br /> Depth to maintain the park like environment of the statuary complex.The sidewalk area will slope into <br /> the Forested interior to disperse runoff to the natural ground onsite per BMP T5.18: Reverse Slope <br /> Sidewalks.The sidewalk was modeled as grass to determine the pre and post-developed flow rate.The <br /> WWHM12 Analysis indicated less than 0.15 cfs increase in the 100-year storm event. No impacts to the <br /> existing onsite Storm Drainage and offsite Storm Drainage systems are anticipated with the <br /> development of the SMM Garden Statuary Site.See Attached WWHM12 Analysis. <br /> 2221 Everett Ave.,Suite 203, Everett,WA.98201 <br /> PH:425-259-5556 <br /> email:brlservicesllc.com <br />