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1 <br /> Preliminary Stormwater Site Plan Everett, WA <br /> Design Criteria: <br /> The proposed Stormwater Management System is designed per the City of Everett <br /> Stormwater Management Manual, January 1997, which complies with the 1992 <br /> Department of Ecology Stormwater Manual, for Washington State. Water quality will be <br /> addressed in compliance to the City of Everett's Stormwater Manual via dead storage in the <br /> detention pond. <br /> Table 1 <br /> jurisdictional Requirements <br /> Peak Run-off Control: <br /> 2-year: Reduce to predeveloped peak <br /> 10-year: Match predeveloped <br /> Ii 00-year: Match predeveloped <br /> Water Quality: Treat the 6-month, 24 hour design <br /> ' storm <br /> Downstream Analysis: �/a Mile downstream <br /> Proposed Drainage System: <br /> Project proposes to introduce a network of underground pipe, catch basins, curbs and <br /> gutter, to collect surface water runoff throughout the site and direct it to a proposed <br /> stormwater management facility. Due to the topography of the site, the stormwater runoff <br /> generated is split into two separate basins. To maintain the natural drainage basins flows <br /> in the developed condition, two separate control structures will be constructed to route the <br /> appropriate amount of runoff to their respective basins. After detention, the stormwater <br /> will tie into the existing conveyance systems that connect to the previously designed and <br /> constructed outfalls into Powdermill Gulch Creek and Edgewater Creek. <br /> Conclusion: <br /> The proposed stormwater management system for this project has been designed in <br /> accordance with regulatory criteria described above and consistent with sound engineering <br /> practice. This design has incorporated stormwater detention and stormwater quality <br /> BMP's, etc. Therefore, no significant adverse impacts to the stormwater management <br /> system are expected as a result of the proposed development. <br /> 1 <br /> 1 <br /> t <br /> PACLAND Job# 50175001 Page 3 <br />