Agenda Packets - 2015/01/05 (2) - Laserfiche WebLink

Home Browse Search

December 30, 2014 Assessment Considerations for Mustang Drive Pavement Rehabilitation and Drainage Improvements Projects Page 2 of 5 Storm Drainage Improvements Street flooding at the intersection of Mustang Drive and Mustang Circle occurs on a frequent basis. This intersection is the low point on Mustang Drive and is the only location where drain inlets exist. An area of approximately 16.7 acres of the industrial park drains to these intersection inlets. Actual flooding is caused by the existing storm sewer system being unable to accommodate runoff from storm events as frequent as every one year. Flooding from these frequent storms cause shallow ponding in the street and grass boulevard areas, while larger storm events will cause street ponding to a depth of about one foot that extends 70 feet to the north of the intersection. A significant contributor to this runoff is associated with the freight distribution property on the south side of Mustang Drive. A drainage study was prepared in 2007 by Stantec (formerly Bonestroo) for Mustang Drive/Circle intersection. The study detailed the drainage issues and inadequacies, and also provided four options for improving flooding at this intersection. These options involve one or more improvements involving street grades, drain inlet and storm sewer modifications, and new storm ponds. Public Works has recommended an option where the existing street profile would be modified to direct excess runoff north along Mustang Circle, requiring reconstruction of the road profile to remove the high point located 70 feet north of the intersection. This will also require modifications to two existing entrance drives to match the revised curb line elevations. This option will direct excess flow to the existing low point in Mustang Circle. The existing drainage channel (ditch) west of the street may also need to be regraded to provide adequate capacity. Funding/Chapter 429 Process Improvements to Mustang Drive/Circle have been discussed for several years and have been included on the Capital Improvement Program and previous years' budgets. The 2015 draft budget includes the following funding: TIF District #2 (420-4650-750): $ 450,000 Stormwater Fund (745-4415-7050): $ 75,000 Total $ 525,000 The City Council indicated to staff during budget discussions recently that they would like to use special assessments as an additional funding source. This process is mandated by Minnesota Statute Chapter 429 and would assess a portion of the costs to the benefitting abutting properties. Chapter 429 has specific steps and activities that must occur during the project development (see attached checklist). The first step is to order a feasibility report. This was done at the December 8th Council meeting. The report is in progress and will consider whether the project is necessary, feasible, and cost effective. Other report items include permits needed, land issues, and a layout of the proposed improvements.