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2016 STREET AND UTILITY IMPROVEMENT PROJECT FEASIBILITY REPORT CITY OF ST. ANTHONY VILLAGE WSB PROJECT NO. 2170-13 PAGE 6 4. PROPOSED IMPROVEMENTS 4.1 Sanitary Sewer The existing 8-inch VCP maintained by the City of St. Anthony will be removed and replaced with 8-inch PVC including the replacement of sanitary sewer services and manholes within the project area. The existing sanitary manholes maintained by the City of Columbia Heights will be removed and replaced with new manhole structures. The existing sanitary mainline and services will remain in place. The proposed sanitary sewer improvements for the City of St. Anthony Village are shown on Figure 3 in Appendix A. 4.2 Water Main As stated in the previous section, both the City of St. Anthony Village and Columbia Heights' water main systems are approaching 50 years of service and the possibility for breaks will continue to increase. The proposed water main improvements consist of entirely replacing the existing CIP water mains maintained by the City of St. Anthony and the City of Columbia Heights with new 8-inch ductile iron pipe (DIP). The project will replace existing water services and curb stops to the right-of-way limits. Replacing these pipes will not only reduce the potential for water main breaks, but also improve the delivery of potable water and fire flow volume at reasonable pressure and head loss. Replacement of the service lines may increase the pressure by providing a clean service pipe. The project will include the installation of new DIP water main valves and fire hydrants. The proposed water system improvements for the City of St. Anthony Village are shown on Figure 4 in Appendix A. 4.3 Storm Sewer The proposed storm sewer improvements include replacing the existing storm sewer to improve area drainage and constructing additional catch basins along Stinson Boulevard NE. The proposed storm sewer system is designed to convey the 10-year peak flow rates as required by State Aid standards and the policies identified in the City’s Surface Water Management Plan. The proposed storm sewer improvements will maintain the existing drainage patterns and discharge points to the greatest extent possible. Installation of draintile throughout the project area is also proposed to supplement the proposed storm sewer facilities as the project corridor consists of poorly draining soils. The proposed storm sewer improvements are shown on Figure 5 in Appendix A. 50