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Item 07D February 9, 2015, City Council Meeting Page 2 Storm Drainage: 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 the grass boulevard areas, larger storm events 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 Southside 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 is recommending 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 re-graded to provide adequate capacity Funding: Improvements costs for Mustang Drive/Mustang Circle are being proposed to be assessed in accordance with Chapter 202 of the Municipal Code. Recommendation: Staff recommends the City Council accept and approve the Feasibility Report from Stantec as reviewed at the February 2, 2015 Council Work Session, and set a Public Hearing for February 23, 2015 at 7:05pm for Mustang Drive/Mustang Circle Pavement Rehabilitation and Drainage Improvements with the estimated total project cost of $610,000.00. Respectfully submitted, Don Peterson Interim Director of Public Works