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4. PROPOSEDIMPROVEMENTS 4.1 Sanitary Sewer The existing 9 -inch VCP will be reconstructed with 8 -inch PVC, including the replacement of sanitary sewer services within the project area. The proposed sanitary sewer improvements are to replace the sanitary sewer system along Edward Street and along 366i Avenue NE from Roosevelt Street to Edward Street. The segment along Harding Street crossing 36°i Avenue NE will be replaced with 8 -inch PVC. The proposed sanitary sewer improvements are shown on Figure 3 in Appendix A. 4.2 Water main As stated in the previous section, this system has had numerous breaks over the past few years. The proposed watermain improvements consist of entirely replacing the existing 10 - inch cast iron water main on Edward Street and on 36`I' Avenue NE from Roosevelt Street to Edward Street will also be replaced with new 10 -inch ductile iron pipe (DIP). The 6 -inch cast iron main on Edward Street and Harding Street at the intersection of 36`I' Avenue NE will be replaced with 8 -inch DIP Water main does not currently exist on 36°i Avenue NE between Edward Street and Silver Lake Road and a number of homes on 36°i Avenue NE are serviced by water service lines extending down 36°i Avenue NE from the water mains located on Edward Street, Harding Street, and Coolidge Street. A new 8 -inch DIP will be added along 36°i Avenue NE from Edward Street to Silver Lake Road tying into the 8 -inch water main at Harding Sheet, Coolidge Street, and Belden Drive. This will `loop" the water system, which increases water circulation preventing water from becoming stagnant. Looping the water system also creates redundancies in the water system, which allows the city to isolate a small area if a temporary shutdown is necessary. The existing water system is shown on Figure 5 in Appendix A. This 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 proposed water system improvements are shown on Figure 5 in Appendix A. 4.3 Storm Sewer The proposed storm sewer improvements include replacing the existing storm sewer on 36°i Avenue NE, constructing additional catch basins on 3611 Avenue NE; at Edward Street, Coolidge Street, and Belden Drive. The existing storm sewer on Edward Street will also be 2013 STREET AND UTILITY IMPROVEMENT PROJECT FEASIBILITY REPORT CITY OF ST. ANTHONY VILLAGE WSB PROJECT NO. 1626-66 PAGE 5 33