1818 121ST ST SE 2018-01-01 MF Import

A trashrack is needed on the outlet of the wetpond to I/ prevent floatable materials from entering the restrictor manhole. City standards require the pond to be designed with one foot of freeboard. The top of the berm to the north is shown as 6 inches above the high water level. All berms should be V one foot higher than the overflow standpipe in the restrictor, although one side of the pond could be lower than the rest to direct any overflows that exceed the capacity of the overflow standpipe. The plans should call for hydroseeding or sodding of the pond aide slopes. Use of floatable materials (such as beauty bark) below the freeboard mark of the pond is not allowed per City standards. Watvault: Two acceeses should be provided to the wetvault, one at each vend of the vault, for future maintenance (sediment removal) purposes. one of the accesses should be a full access, with a ladder to the bottom of the vault. � (� [ Cll[illlV i r��'IV^ �iG t��d'�If the water depth in the pond musts be increased to address rP�� City det tion requirements, City fencing requirements should be ept in mi^.i. City standards require all surface ponds or ba 'ns with a maximum depth greater than three feet to be fenced th a six foot high perimeter fence unless one of the followin��conditions is met: 1) a 10 foot wide�safety bench for every three feet of design water depth�and the side slopes of the pond are no greater than 3:1�(H:V); or 2) the maximum water depth f the facility does not exceed three feet during a two y r storm, nor exceed three feet for more than four ho�� for a 25 year storm; the side slopes are a maximum of •1 (H:V); and the facility is a dual use facility,�or 3) specific City Council approval is g� nted for an exemption per che criteria in the Cit �s Desiqn and Construction Standards and Specificati s. If fencing is required, its exact location and al�o the location of the gates necessary to access the pond for maintenance need to be shown on the plans. ,