Agenda - Public Works Committee - 03/20/2012

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Tonight we would like to focus on a couple of the projects that are located in neighborhoods that are proposed to receive street maintenance activities this summer. I would like to draw your attention to section 4 related to 163rd Lane. This area is located west of Elmcrest park. There is an existing landlocked low area south of 163rd Lane and east of Wolfram Street. During a majority of the year, stormwater runoff infiltrates int the soil. However, during early spring when the ground is frozen and during periods of heavy rainfall, water levels have risen to elevations taht cause flooding of adjacent properties. Different sized outlet pipes were analyzed to drain the low area. Installing an outlet will have a significant impact on the high water levels in the area and, most importantly, the length of inumdation will be greatly reduced. We recommend driectionally drilling an 18" HDPE pipe south to County Ditch #3 with an invert elevation of 872.0 Installing the pipe at an elevation of 872.0 will continue to allow 3" storm events to infiltrate into the soil. The estimated cost to install this outlet is $80,795. An easement will be required on the lot to cover the maximum ponding area and the route of the outlet pipe from the pond to the south property line. The directional drilling may require acquisiton of additional easments along the route of the pipe which can be time consuming. Construction of the connection to County Ditch #3 may be best done under frozen conditions. The estimated cost of the project exceeds the annually budgeted amount for storm sewer improvements so it may need to be spread over a couple of years. The plat for this neighborhood, detail of the drainage and utility easement over the low area and the plats between the low point and County Ditch #3 are attached. Funding Source: In the fall of 2011, while staff was in the process of updating the City's Capital Improvement Program (CIP), we budgeted additional funds to stormwater improvement projects over the next two years in an effort to address some of these concerns. The Capital Improvement Program (CIP) lists a $75,000 annual expenditure for the next 5 years to address city wide drainage enhancements. Staff Recommendation: Staff recommends adding this project to the list to be evaluated when the Capital Improvment Program is updated. Easement acquisition, construction timing and budget considerations require additional investigation. Committee Action: Motion to recommend adding this project to the list to be evaluated when the Capital Improvment Program is updated. Final Report Plat Easement Voltins Rambosek Attachments Form Review Inbox Reviewed By Date Brian Olson MaryJo Warner 03/15/2012 03:01 PM Kurt Ulrich MaryJo Warner 03/15/2012 04:02 PM Form Started By: Tim Himmer Started On: 03/14/2012 04:22 PM Final Approval Date: 03/15/2012