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Included is an exhibit(Appendix A),provided by the City of Everett,showing the <br /> conveyance system route. <br /> B. Pre-Developed Hydrology <br /> See Appendix B <br /> C. Developed Hydrology <br /> See Appendix B <br /> MR#7 - Flow Control <br /> D. Stormwater Flow Control Plan <br /> Runoff control facilities will consist of underground detention tank designed to detain runoff <br /> from the developed site and release the runoff volume based on the City of Everett standards <br /> meeting the Department of Ecology 2014 Stormwater Management Manual for Western <br /> Washington. The detention tanks are designed to accommodate the stormwater runoff from the <br /> entire site,including the landscaped areas,permeable paver areas(considered as land scape <br /> area in the hydrology model),parking lot and roof tops. Detention volume will be provided by <br /> using one 6.0-foct diameter underground detention tank.The tank is 154-feet long. The <br /> detention facility will discharge into the existing storm drain system located in the gutter line <br /> of the east side of 19th Ave. SE. <br /> For Drainage Calculation See Appendix B. <br /> MR#6 -Runoff Treatment <br /> E. Stormwater Treatment Plan <br /> Per the City of Everett Standards the Department of Ecology 2014 Stormwater Management <br /> Manual for Western Washington,no stormwater treatment facilities are required for projects <br /> which the total effective,pollution-generating impervious surface(PGIS) is less than 5,000 sq. <br /> ft. and which the total of pollution-generating pervious surface(PGPS)is less than three- <br /> quarters of an acre. <br /> The total of pollution-generating pervious surface(PGPS) is 4,795 sq. ft. <br /> No treatment plan is provided as part of this project. <br />