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' SOUNDVIEW TECHNOLOGY CENTER EVERETT, WA <br />PROJECT OVERVIEW <br />PROPOSED IMPROVEMENTS <br />The proposed development will consist of 4, 2-story buildings totaling approximately 461,800± SF with <br />approximately 686 parking stalls, stormwater management facilities, utilities and on -site landscaping on a <br />39.4-acre site at 5900 361" Avenue W in Everett, Washington. The property is zoned M-1 (Industrial) <br />1 DESIGN CRITERIA <br />The City of Everett utilizes the 2014 Stormwater Management Manual for Western Washington (2012 <br />manual amended in 2014) drainage requirements. Stormwater discharges shall match developed <br />discharge durations to predeveloped durations for the range of predeveloped discharge rates from 50 <br />percent of the 2-year recurrence interval peak flow up to the full 50-year peak flow. The pre -developed <br />condition to be matched shall be a forested land cover. <br />Jurisdictional Requirements <br />Table 1 below summarizes the City of Everett Stormwater requirements. <br />ITABLE 1 <br />1 <br />1 <br />I <br />Jurisdictional Requirements <br />Duration Analysis: <br />2-year: <br />Reduce to 50% pre -developed duration <br />50- ear: <br />Match pre -developed <br />Water Quality Flow Rate: <br />Vault #3 (Basin B) = 0.092 CFS <br />Vault #4 (Basin C) = 0.053 CFS <br />Downstream Analysis: <br />Level 1: <br />1 '/a mile downstream <br />IMAY 23, 2017 STORMWATER DRAINAGE REPORT PAGE 1 <br />