09-08-2003 Council Packet - Laserfiche WebLink

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SEP 0 8 2003 REQUEST FOR COUNCIL ACTION O.. I or ORONO DATE: September 8,2003 ITEM NO. Department Approval: Name Gregory A. Gappa Title Director of Public Services Administrator Reviewed:Agenda Section: Public Services Director ’s Report Item Description: Accept Quotation tor Stubbs Say Road Erosion Project This is an erosion control project to repair an area with severe gully erosion on a property located at 65 Stubbs Bay Road South. This erosion is caused by the discharge from a culvert under Stubbs Bay Road that flows down a steep slope across the property. This culvert drains a large pavement area in the vicinity of the Stubbs Bay/Watcrtown Road intersection. This stormwater then flows through a wetland and strean) complex into Stubbs Bay. The distance from this property to Stubbs Bay is only 2,000 feet. The Stubbs Bay Watershed has been identified by both the City and the Minnehaha Creek Watershed District has a priority area because of the poor water quality in Stubbs Bay. The City's Surface Water Management also identifies this area for the completion of channel erosion projects. Over the past several years, the property owners have tried unsuccessfully to solve this erosion problem. There are two basic methods to correct this problem the traditional method would have been to construct a ripraped channel. This is a costly solution that is not aesthetically pleasing and does not improve water quality. Over the past several years, the use of native vegetation for channel stabilization has become more prevalent. I hese projects are less expensive than riprap, more aesthetically pleasing, and also provide water quality treatment. We are recommending the use of native vegetation channel stabilization techniques for this project. The City now is required to have a NPDES stormwater permit, and this permit require agencies to establish a program for the implementation of Best Management Practices (BMP’s). The installation of native vegetation channels is one of our BMP's, and we need to report on an annual basis BMP's that have been utilized. Our recommendation is that completion of this project with stormwater utility funds is appropriate because of the gully erosion occurring and the amount of public street runoff that flows through this property. This propert>' is substantially impacted by the large amount of storm water drainage flowing through the middle of the property. The priority ranking for stormwater utilitv-funded projects is in this order; first structure flooding problems, second erosion problems, and third areas with poor drainage that is not threatening structures or causing erosion. Page 1 of 2