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72 MISSISSIPPI WATERSHED MANAGEMENT ORGANIZATION AGREEMENT Exhibit A Agreement #204-12-01 1. Project Description and Purpose The purpose of this project: is to construct an underground stormwater treatment device that will result in improving the quality of runoff conveyed from the City of Saint Anthony Village to the City of Minneapolis, and ultimately, to the Mississippi River. In the recent past, the City of Saint Anthony Village has provided flood protection but has had limited opportunity for stormwater quality improvement. Currently, stormwater runoff generated in the Wilson Street region of the City of St. Anthony Village receives little or no treatment prior to being discharged into the City of Minneapolis. The City of Saint Anthony Village and the Mississippi Watershed Management Organization (MWMO) share the goal of improving the quality of stormwater runoff conveyed from St. Anthony to the Mississippi River. A .map showing the project location is shown in Figure 1. The south part of the City of Saint Anthony Village is drained by a storm sewer system that conveys runoff from about 594 acres south into the City of Minneapolis. The outlet of this watershed is a 54 -inch pipe adjacent to Hennepin County State Aid lighway 88 (CSA I1 88). The proposed improvement includes an underground stormwater treatment system that diverts the desired flow rates into a treatment chamber that uses gravity and stormwater flow to settle and trap particulate matter. The underground treatment device typically has treatment efficiencies between: 40% to 80% for total suspended solids 10% to 30% for total phosphorus. To maximize the overall system efficiencies, a secondary chemical or filtration system will be added to help settle suspended solids and reduce dissolved and particulate phosphorus to achieve a 50/70 pollutant -reduction goal. 2. Scone of Services and Deliverables The designated funds are to cover design and installation an in-line stormwater treatment system, bypass manholes, storm sewer, mobilization, restoration of the site, and a plan for ongoing maintenance by Grantee, plus a 15% contingency. The MWMO will be granted access to monitor the functionality of the system an ongoing basis after the project is installed. A final report to the MWMO is also within the scope of work. 3. Schedule of Work Descri tion of work Timeframe Location determination and property research _ February 2013 Concept -level design and neighborhood meeting1/12013 Al— Preliminarydesign and review with project partners Ma� 2013 Final design and request for bids Jul, 2013 Construction September 2013 _ Monitorin b MWMO Ongoing, starting Spring 2014