Agenda - Public Works Committee - 04/18/2023

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Meeting Minutes Improvement Project #23-01 161st Avenue Reconstruction West Pond Construction Impacts Friday, April 14, 2023 10:00 to 11:10 AM Attendees: City: Brian Hagen, Bruce Westby, Joe Feriancek, Aaron Madsen, Jake Hoel Property Owners: 7833 159th Avenue (Alma and Rob Teigen) and 7826 161st Avenue (Jeff Lubarski) Before the meeting started, Engineering staff set construction limit stakes on both properties. Staff explained that the total drainage and impervious surface areas contributing stormwater runoff to the easement in their backyards is not changing, therefore the stormwater that will be treated in the new pond will have the same volume as it currently does. It was discussed that the drainage area for this pond includes approximately the south half of Central Park and the right of way along 161st Avenue between Armstrong Boulevard and just west of Xenoilith Street. Staff also explained that stormwater runoff currently flows overland across Central Park, along 161st Avenue, and through a swale on the west side of 7826 161st Avenue to the easement within their backyards. However, stormwater runoff is now proposed to be captured in catch basins and conveyed through storm sewer pipes underground to the pond. The pond must therefore be excavated 6 feet to allow the storm sewer pipe to daylight and provide sufficient capacity and space for sediment to settle. The property owners generally voiced the following concerns. • Tree Removals o Will remove sightline buffering between neighboring properties? o Will increase noise originating in Central Park for 7833 159th Avenue o Staff noted that plans call for 7 coniferous trees approximately 6 feet tall to be planted at the top of the pond inslope on 7826 161st Avenue, and for 2 deciduous trees to be planted on 7833 159th Avenue. o 7833 159th Avenue property owners said 6-foot tall trees would not provide enough benefit and asked if the City would transplant the 8 existing Norway pine trees proposed to be removed along the top of the pond on their property. Staff will explore costs.