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r-- <br /> � � � <br /> m � x <br /> C H <br /> � Hxcn <br /> yzH <br /> K c] <br /> H �7 <br /> oxo <br /> 'i1 H �i <br /> V1 H <br /> � �� FINLEY/�►RCHITECTS, ,AIA, PSP. <br /> H^�, g � '��'���� � ; <br /> Y,w n � <br /> zH � <br /> �`3 z February 23, 1989 FE� 2 •1 19c�� <br /> l�i�y ... __._..., ._ .... <br /> ....__.......... <br /> g CITY OF [VERETT <br /> � d�' Public Works Deot. <br /> �y� � Ki rk Brooks �i <br /> x H v. City of Everett <br /> y � y Public Wurks Cepartment I <br /> 3200 Cedar Street I <br /> Everett, WA 98201 <br /> RE: New Office 13uilding for Okada Enterprises (33rd & Broadway) <br /> On-Site Detention Requirements I <br /> Dear Kirk: ' <br /> Per your reouest, the following sizing of on-site detention requirements <br /> is provided, lhis inForniation is based on the City of Everett <br /> publication, "On-S`�te Detention Requirements". <br /> j'�� From City Requirements <br /> � Table kl Combined sewer outside downtown 10 year <br /> 1 , predevelopment storm; 10 vear post-development <br /> storm. 5zfl4 s.F. � O•l� � <br /> (1�� Table �2 Slope from west to east pro�rty lines is <br /> approximately 5%. Existing rea 666 sf (.015 <br /> acre) impervious (or ltw) 52 4 ( .-41--ae-�e) <br /> grassed (or 8990). Allowable release rate for <br /> I 1� impervious is 1.40 cfs%ac. Al �owable release <br /> rate for grassed is .41 cfs/ac. Total <br /> allowable release rate at existing ar <br /> ' 1�1 ( .015)1.40 + ,'.2 ( .41) _ .021 + .049 = 07 cfs <br /> - O•%j CfS lf MirLmUn. /-Lot.l; <br /> �E� f Nf71VGTi o/JS �' <br /> Table N3 - New area development - 8550 �mpervious <br /> (5950 x .85 = 5058 sf) and 15% landscaping <br /> wm. A. Fin�eyu6 /+.I.A.. f\ (5950 x .15 = 892 sf) or .116 acre impervious <br /> . +�►� �892 Hewitt Ave. \ .OZ acre landscaping. Detention requirement <br /> . P.O. Box90OB \ for impervioui is 4256 cf/ac; for landscaping <br /> � ����ecc,waseeos � is 615 cf/ac. Total de+ent0zn 615U�re�493t7�+ <br /> 258-647'I therefore ( .116)(4256) ( . )� ) <br /> �,.,,,�� I �12.6 = 506.3 cf. <br /> � � 6 Y � � n L��� <br /> � !i_/'3��J . i).Y�G�'7�a.L. <br /> ,� _ O./35u, <br /> -� r t�/=/' T/a!�[F- (n <br /> obert P. Le iman ��r,,f ^��^"y' •'F'�"„�'� <br /> �G ..�-.`:r/.�.a✓. <br /> ^.. � . .. .________' <br /> •—•----- ".._.._..___...._..._...__..._. <br /> RPL:cml �f'E�Unt'C'+U/ <br /> r{/O [�,c?ENTia�/ O�P �i9firz'Z=�Ji <br /> � � zr87 <br /> �, `�" <br /> :��.:.<s� :: <br />