11325 19TH AVE SE 2018-01-01 MF Import

� Accesa must be provided to the first cell of the pond to facilitate ft�.ture sediment removal. A fifteen foot wide qravel access road to the bottom of the pond, with a minimum compacted thickness of six inches and a maximum slope of 6:1, is called for in the standards. The cell volume would should then be increased to compensate for the volume dieplaced by the road. The berm between the two cells should be prote�ted aqainst , eroeion. Quarry spalls or rip-rap, placed 6-12 inches thick alonq the top of the berm and down the sides for a short distance, should be adequate. Pioina The City allows PVC to have a minimum cover of 3 feet. The pipe from catch basin ,�7 to the first cell of the wetpond should probably be raised to prevent accumulation of sediment in the pipe. If the pipe is raised, rip-rap should be placed at the outlet to to the bottom of the pond. Rip-rap should be placed at the outlet of all pipes discharging into swales or wetponds. A trash rack should be placed on the 12 inch PVC pipe conveying flow from the biofiltration swale to catch basin ,}7, and on the existing 12 inch concrete pipe at the downstream end of the 33 foot long section of biofiltration swale adjacent to SR 527. The outlet pipe from the second cell of the wetpon3 must have sufficient cover along its length to allow safe removal of sediment in the future. The pipe should have at least 2 feet of protection both horizontally and vertically. Per City standarde, a catch basin or manhole is required at changes in storm pipe alignment - the pipe from the overflow atructure must tie into the storm system at a catch basin or manhole. Miscellaneous: The top and toe elevations of all rockeries adjacent to or associated with stormwater facilities must be given. It is important to leave enough horizontal room for rockeries. City of Everett standards require a minimum of 4 feet, even for a rockery under 7 vertical feet. The plans need to show this distance.