1600 121ST ST SE 2016-01-01 MF Import

araGina: The elevation of all contour elevations must be designated clearly, especially those associated with the pond and the veqetated swale. oil/water ee�arator(8I: The inlet and outlet elevations of the separator(s), the elevation of the bottom of the separator(s), and the position and height of interfor baffles must be cle�rly shown on the vault detail. The separator must be equippad with a samplinq tee at ite outlet. Downstream conditione must not r^_sulr. in water being backed up into the oil/water separator(s). "he maximum elevation of water downstream should be a minimum of one foot below the invert elevation of the outlet pipe. Overflow pipinq is required for the oil/water separator(s). Therefore, a flow diversio� catch basin must be provided. Please seQ details �471 and �422 in the City of Everett�s Design and Construction Standards and Specifications. The overflow pipe(s) should be equipped with a floatable material separator, per City std. $410, that extends :. minimum of 6" below the invert elevation of the pipe to the separator. The inlet pipe should be sized to convey the oil/water separator design flow when the overflow pipe is conveyinq the 30 year destgn flow. The crown of the vault inlet must be at or below the invert elevation of the bypass pipe. A minimum of two feet must be provided below `_he invert of the vault inlet and the bottom of the flow diversion catch basin. The oil/water separator maintenance notes from section 4.11.1 of the City of Everett Desiqn and Construction Standards and Specifications must be included on the plans. Piuina• SDMH 21 should have a solid lid. City standards call for all type II catch basins and manholes to be equipped with ladders per standard plan /606, in addition, all type II catch basins and manholes with "catches" are required to have locking lids. These