Agenda - Public Works Committee - 04/19/2011

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Public Works Committee Date: 04/19/2011 By: Tim Himmer Engineering/Public Works Item #: 5. 4. Information Title: Consider Storm Sewer Outlet Revisions Related to City Project #08-33; Ute Street Improvements Background: On May 27, 2007 a petition was received by the City Council for the bituminous paving of Ute Street north of 179th Lane (terminating at the dead end turn around). City Council directed the preparation of a feasibility study, which was conducted in the fall of 2008. Through the process, many issues were identified and resolved, and the project was constructed last fall. A public hearing was held prior to the levying of assessments upon project completion. At this time the only outstanding items are completion of punchlist items and to ensure proper stabilization, since seeding was completed late in the fall. Notification: Observations: Following substantial completion of the project a concern was expressed by a resident requesting revisions to the new storm sewer outlet located on his property. An easement was acquired from the property owner prior to commencing the project, but there were no meaningful conversations as to what the ultimate design and/or appearance would be for this structure. This individual believes that modifications should be made to the outfall to improve aesthetics and reduce his concern for potential liability should someone become injured while accessing the lake through this location. Attached are some photos of the outfall for review. With the final punchlist clean up for the project, revisions could be done to this outfall but they would come with a cost, as the final design approved by the Council was implemented per the project specifications. The outfall was constructed, in conjunction with an upstream sump manhole to improve water quality prior to discharge to Rogers Lake, which was subsequently reviewed and approved by the Lower Rum River Water Management Organization (LRRWMO). Staff feels that the outfall is functioning as designed, but there may be an opportunity to narrow the basin by relocating some of the rip -rap around the edges to the spillway adjacent to the water. The resident has stated that they would like the stilling basin removed all together and the stormsewer pipes could be extended down to waters edge; they would also like a different type of rock that isn't as jagged to reduce potential liability concerns from injuries. Staff will be contacting the resident to make them aware of this meeting, and to further discuss what their expectations are for this outfall. We have also met with a contractor that has quoted us a price of $800 - $1,000 to perform the stilling basin revisions mentioned above. This work would be performed utilizing hand labor or small equipment to limit damage to the new turf that is being established, and any damage done by this revision would also be restored. Staff is looking for input from the Council on whether or not to consider modifications to this stormsewer outfall. Funding Source: If authorized, these improvements would be funded through the Stormwater Utility Enterprise Fund. Staff Recommendation: Committee Action: