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

l% 2) the maximum water depth of the facility does not exceed three feet durinq a two year storm, nor exceed three feet for more than four hours for a 25 year storm; the side slopes are a maximum of 3:1 (H:V); and the facility is a dual use facility; or 3) specific City Council approval is granted for an exemption per the criteria in the City�s Deaign and Construction Standards and Specifications. Detention Pond• The access road must be provided to the first cell, as it is in this first cell that the majority of sediment will ac�umulate. If the pond will not be fenced, the maximum side slope of ✓ any berm between the two cells must be 3:1. Oil/watEtr aeparator(s): u��t � - — --- �r,n�rn The inlat and outlet elevations of the separator�s)_,__t e �i"� t��, e evation of the bottom of the separator(s) and the (�� I posttion and heiqht of in�erior baffles mus� clearly ��JI��'' shown on a vault detail. ,�� S � � �� t„', �� (rn�(;�� ir� ✓ ✓ The vault details must also call out a sampling tee at each vault outlet. Downstream conditions must not result in water being backed up into the oil/water separator(s). The maximum elevation of water downstream should be a minimum of one foot below the invert elevation of the outlet pipe. The oil/water separator maintenance notes from section 4-11.3 of the City of Everett Design and Construction Standards and Specifi.cations must be included on the plans. pesiqnated Car Wash Area: At least one siqn must be posted near the car wash area, ti identifying its use. The location of the siqn must be shown on the plans, as well as what the sign will say. The plans must show details of the cover over the designated car wash area - particularly with respect to the dimensions ✓ of the cover (slightly larger than the space itself) and its heiqht (high enough to allow washing of the tallest commonly used domestic vehicle, such as a van).