Agenda - Public Works Committee - 07/17/2012

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Case #5.3: Consider Stormwater Improvements at 148th Lane — A Continuation of Discussion Related to 2011 Flooding Concerns City Engineer Tim Himmer reviewed in his staff report that there is a low area across three lots south of 148th Lane that was created as a stormwater pond for the area and wetland mitigation for the development. There is a storm sewer inlet to this area along the west edge, which drains the subdivision to the north. There is also an outlet from this area on the east end that connects to a pipe that runs easterly and parallel to 148th Lane. The invert of this outlet pipe is approximately 2.5 feet above the low point in the basin. The outlet pipe also connects to a structure in the boulevard of 148th Lane that takes storm water runoff from the roadway and directs it easterly as described above. The inverts on both these pipes are at approximately the same elevations, and therefore water may be entering this basin that is not intended to flow there from the stormwater system. It was also observed that the basin has several undulations in the ground surface that do not allow the water to evenly spread out across the entire drainage and utility easement; basically there appears to be three separate, somewhat isolated basins. Mr. Maul, 5590 148th Lane stated he prefers Option #3 in the proposal and along with that a backflow preventer and raise the elevation so the water can drain out. Mr. Saba, 5630 148th Lane was present to discuss throughout the twenty five years all the sediment that is setting throughout the back of the homes. Councilmember McGlone questioned the gate valve. Motion by Chairperson Backous, seconded by Councilmember McGlone, to recommend to City Council staff's proposal to install a check valve in the storm pond outlet to block drainage from the street and only allow water to exit the basin through this structure, thereby eliminating additional flow to the area and include this as part of the change order to IP 12-24; 2012 Storm Sewer Improvements. Motion carried. Voting Yes: Chairperson Backous, Councilmember McGlone. Voting No: None. Absent: Councilmember Elvig. This is being brought forward as a separate case at the June 12th, 2012 City Council meeting.] Case #5.4 Consider the Installation of Stop Signs and an In -Street Pedestrian Crossing Sign near 150th Lane NW and Ute Street NW City Engineer Tim Himmer reviewed in the staff report that on April 3, 2012 staff received a petition signed by twelve property owners in the neighborhood near the intersection of 150th Lane NW and Ute Street NW. They are requesting the installation of stop signs at this intersection, consideration for the installation of an in street pedestrian crossing at the location of the existing City trail crossing on 150th Lane, and reduction of the speed limit on 150th Lane to 15mph. Public Works Committee / May 15, 2012 Page 5 of 7