11102 EVERGREEN WAY 2018-01-01 MF Import

The separator should be equipped with a sampling tee at fts outlet. Downstream conditions must not result in water being backed up into the oil/water separator. The maximum elevation of water downatream should be a minimum of one foot below the invert elevation of the outlet pipe. overflow piping is required for the oil/water separator. Therefore, a flow diversion catch basin must be provided. Pleasa eae details f421 and �422 in the City of Everett's Deaign and Construction Standards and Specifications. The overflow pipe should be equipped with a floatable • + material separator, per City std. �410, that extends a minimum of 6" below the invert elevation of the pfpe to the separator. The inlet pipe should be sized to convey the ��il/water aeparator design flow when the overflow pipe is conveying the 10 year desfgn 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 the 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 Design and Construction Standards and Specifications must be included on the plans. plolac: All catch basins used in conveying stormwater downstream from the wetpond, detention facilities, and/or vegetated swale must have solid lids in order to prevent runoff from entering them. The type of pipe used in the storm drainage system must be identified. CMP is not allowed in the public right-of-way. The City allows PVC to have a maximum diameter of 15 inches, a maximum depth of 22 feet, and a minimum cover oP 3 feet. On storm drains with depths to the flow line exceeding 5.5 feet, the following structures must be used: I Catch Basin Type II (standard plan #404) - maximum pipe size of 21"