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11235s¢6msraE[r r 425A539501 <br /> , 5urtE2N1 r 445.453.8108 � , ' <br /> 9ELLEWE�WA 98004 INNV.PACUN�.WM <br /> Engineering Memorandum <br /> Date: April 20, 2007 <br /> To: Dennis Roberson, City of Everett Public Works ���� G � U 5 -V � ' <br /> From: Jason Green <br /> )enellc Taflin, P.E. <br /> Subject: Communily Health Center, Everett, Washington <br /> Storm�vater Management Summary <br /> This memorandum is provided to summarize the proposed Stormwater Management system <br /> ior the above referenced project. <br /> Currently, a 5,072 SF health �linic building exists on the .61 AC site localed at 8609 Evergreen <br /> Way in Everett, Washington. The proposed improvemunts will indude the demolition and <br /> replacement of the existing single story building with a ne�v two srory 72,-�80 SF office <br /> building. Additional improvements will include parking lat striping and landscape island <br /> improvements. Approximately 1,055 SF of asphalt pavement will be created and/or replaced <br /> as part of this redevelopment. <br /> As stated in the City of Everett Notice of Application and Proposed Mitigated Determination oi <br /> Non-Significance (SP#07-003), dated January 24, 2007, stormwater treatment �vill be required <br /> ii 5,000 square feet or more of hydraulically-connected pavement is created and/or <br /> redeveloped by lhis project. Therefore, bAcause this project proposes to create and/or replace <br /> only 1,055 SF of asphalt pavement, stormwater treatment is nut required. Moreover, this <br /> project will create an additional 70 SF of new landscape area. <br /> Currendy, srormwater runofi sheet flows are collected by existing catch basins and associated <br /> underground piping to the south and east of the site. The stormwater is then conveyed to the <br /> Ciry of Evereu storm drainage system located in Evergreen Way. As part of this project the <br /> existing storm drainage system will be maintained. A new catch basin structure will be <br /> installed to allow the proposed foundation and roof drainage to discharge to the existing <br /> system. <br /> During construction, erosion and sediment control measures will be implemented ro prevent <br /> any sediment-laden runoff from entering the system. These measures include construction <br /> fencing and inlet protection. <br /> ti �� , <br /> Q Sy <br /> g s � <br /> �• <br /> 41872 <br /> �o,� �'FcrsteR�° �,�� <br /> �'Sstoxn� ENc� <br /> n��s e/�a/ i <br /> a�— — <br />