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MINIMUM REQUIREMENT #3 - WATER POLLUTION SOURCE CONTROL <br /> This project discharges stormwater to the City of Everett's combined sewer system, and is <br /> therefore exempt from this requirement. <br /> MINIMUM REQUIREMENT #4 - PRESERVATION OF NATURAL <br /> DRAINAGE SYSTEMS AND OUTFALLS <br /> The existing drainage patterns from the development area are sheet flows as described <br /> earlier in this report. All existing discharge locations for the project site are into catch <br /> basins and storm drain that contribute to the combined sewer system. Thus, there are no <br /> natural drainage systems or outfalls to be preserved. <br /> MINIMUM REQUIREMENT #5 - ON-SITE STORMWATER MANAGEMENT <br /> In accordance with the City's stormwater ordinance for the combined sewer area, this <br /> Minimum Requirement is not applicable. <br /> MINIMUM REQUIREMENT #6 - RUNOFF TREATMENT <br /> Runoff treatment facilities are required in any TDA where 5000 square feet of PGHS is <br /> proposed, or more than % acre of native vegetation is converted to lawn or landscaping. <br /> 9917 square feet of rubberized surfacing is considered pollution-generating by Ecology. <br /> This surfacing is permeable and will therefore have a treatment layer of gravel, meeting <br /> the City's Standard Drawing 430, installed beneath the surfacing. All other proposed <br /> impervious is non-pollution generating, and there is no existing native vegetation on site, <br /> therefore no further treatment facilities are required. <br /> MINIMUM REQUIREMENT #7 - FLOW CONTROL <br /> Because the site is located in the combined sewer area, the City's ordinance related to <br /> stormwater controls in the combined sewer area applies. In accordance with Section 6.10 <br /> of the Design and Construction Standards and Specifications, flow control shall comply <br /> with the following standards: <br />