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M E M O R A N D U M � <br /> h,'��/7 '�^n�� �V `�� �-�% <br /> Y��%�W%' �l/� ` <br /> TO: Kirk Brooks �r��C(✓ <br /> ggpl(; Jane Zimmerman //� <br /> DATB: February �8, 1994 `" <br /> SIIBJECT: Plan Review, SEPA �50-92, Mukilteo <br /> School District's ''�ntral Facilities <br /> Complex <br /> CONDITIONS OF APPROVAL <br /> The decision document requires a copy of the Hydraulic <br /> Project Approval to be subt.�stted with the plans. <br /> With regards to the runoff routed to wetlands D and E: to <br /> meet City standards and the conditions of approval, a <br /> baffle-type oil/water separator is requir_ed upstream of the <br /> biofiltration swale and the dispersion trench. This baffle- <br /> type oil/water separator should replace natch basin #15. �� �,� <br /> , � , <br /> � � �d��( �`� _t f ��.z J�a `c'►�,�.. <br /> CALCOLATIONS �i5 d gC�� �• ` . ��� ��t���r' t�� �' <br /> � fi[� , � G� P <br /> Weteond/Detention:_ �.�, ���E$sQ � C'j''f� ?/ p,�a � <br /> The detention system needs ta be �esigned to �ee_t }�rqth City <br /> of Everett and Department of Fisheries--��f aT±`HPA is <br /> required) standards., City__of-Everett standards call for <br /> release of the 25;year"-storm runoff at the existing 10 year <br /> rate, which—is�more stringent than Fisheries' standards for <br /> lajqe��sEorms. <br /> Additional comments are written directly in t'�e submitted � <br /> drainage report. <br /> stormwater treatment svstsm: <br /> City standards require an oil/water separator to be provided <br /> upstream of the vegetated (biofiltrztion) swale. <br /> City standards require high flow bypasses for both oil/water <br /> separators and vegetated swales. Because the contribut.ory <br /> area is small, and because the flow will. be split downstream <br /> t - - _._ .w <br />