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4. Proposed Improvements 4.1 Sanitary Sewer ' In order to convey the anticipated peak wastewater flow and reduce the basement backups, the existing sanitary will be removed and reconstructed with larger pipe at the current location. The segment on 291h Avenue from Wilson Street to CSAH 88 will be reconstructed with 12-inch PVC pipe. 1 The proposed sanitary sewer improvements are shown on Figure 2 in Appendix A. 4.2 Watermain The existing water mains will be entirely or partially exposed by the excavation required for the sanitary sewer and storm sewer improvements. ' In addition, many of the water service lines to the individual properties will be removed or disconnected for a period of time. The excavation for the other utilities provides a timely opportunity for improvements to the water distribution system before significant problems are experienced. The proposed water main improvements consist of replacing the existing 6- ' inch mains with new 8-inch ductile iron pipe mains and copper service taps and lines. This will improve delivery of potable water and fire flow volume at reasonable pressure and head loss. ' Replacement of the service taps and lines should improve the water quality by reducing the potential for lead to enter the system and possibly increase ' the pressure by providing a clean service pipe. The proposed water system improvements are shown on Figure 3 in ' Appendix A. 4.3 Storm Sewer The proposed storm sewer improvements include replacing the 36-inch RC pipe at the intersection of Wilson Street and 29th Avenue with a 66 7inch RC pipe. Water will be diverted to the east into the storm water storage basin at Silver.Point Park. For storm events which exceed the capacity of the new storm sewer system, the existing overland overflow route will be maintained. ' Additional catch basins are proposed forthe 29th Avenue intersections of and new storm sewer are proposed at Roosevelt Street,Wilson Street,and Silver Lake Road-to reduce the occurrence flooding. 1 . City of St.Anthony AL 2000 Street 8 Utility Improvement Project WS'B Feasibility Report WSB Project No. 1065.25 ' Page 6