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V � <br />contain accumulated oil. To address this problem, a <br />floatable material separator (City std *411) without a vent <br />hole can be used on the bypass pipe if enough clearance <br />exists between the crown of the bypass pipe and the <br />ground/rim elevation. Adequate pipe cover must be provided <br />and City installation requirements must be met (required <br />pipe cover depends on the pipe material and a minimum of 1.5 <br />feet is necessary between the rim elevation of the <br />manhole/cb and the crown of the bypass pipe to meet all city <br />standards regarding installation). <br />A third alternative is to install a r�strictor-typp unit on <br />the bypass pipe equipped with a baffle, made of a larger <br />diameter oipe welded to the standpipe. The space between <br />the baffle and the overflow standpipe must be larqe enough <br />to not restrict flows. The baffle must be stiffened by <br />welding a"rib" from the standpipe �o the baffle, and must <br />extend a minimum of 4 inches above and 6 inches below tl�e <br />overflow elevation. The water quality device restrictor <br />standpipe must also be capped and provided with a one inch <br />vent hole. <br />The entire contributing area must be used in calculating the <br />size of the oil/water separator vault altnough only the <br />paved surface is required to be routed through the <br />separator. <br />A minimum of two feet of catch should be provided below the <br />invert of the vault inlet and the bottom of the highflow <br />bypass catch basin. <br />��The inlet and outlet elevations of the separator, the <br />elevation of the bottom of the separator, and the position <br />and height of interior baffles should be clearly shown on <br />the vault detail. <br />� The separator should be equipped with a sampling tee at its <br />outlet. <br />The oil/water separator maintenance notes from section <br />�/ '�4.11.1 of the City of Everett Design and Construction <br />Standards and Specifications must be included on the <br />drainage plans. <br />� J�he following information regarding the oil/water separator <br />must be submitted far review and approval: <br />1) design flow calculations <br />2) design inle: capacity calculations <br />3) orifice sizir.g calculations <br />4) oil/water separator sizing calculations <br />5) bypass sizing calculations <br />6) copy of site plan showing the contributing area <br />