CC PACKET 09081998 - Laserfiche WebLink

Home Browse Search

' 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 Wilson Street from 29`h Avenue NE to 27`h Avenue Northeast will be reconstructed with 24-inch(24")PVC pipe. The proposed 24-inch(24")pipe will provide a theoretical capacity of 3,400 to 5,400 gpm which is slightly in excess of the projected peak flow for the area. 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 mains with similar sized new ductile iron pipe mains and copper service taps and lines. The existing pipe sizes are sufficient for delivery of adequate potable water and fire flow volume at a reasonable pressure and head loss. 1 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 (36") RC pipe at the intersection of Wilson Street and 29`h Avenue with a 33-inch (33") RC pipe. This will provide increased capacity downstream in the Wilson Street system ' 'by reducing the flow which can be accepted into the system'of this location. For storm events which exceed the capacity of the storm sewer system, the existing overland overflow route will be maintained. The existing 36-inch(36")RCP at the intersection of Pahl Avenue and Wilson Street will be replaced with two(2)24-inch (24")arch RC pipes which are equivalent to a 36-inch(36")round to accommodate the lowering of Pahl Avenue by approximately one foot (P). This will provide for additional storm storage capacity in this intersection preventing the flooding of adjacent structures. ' City of St.Anthony-1999 Street&Utility Improvement Project Feasibility Report A ' WSB Project No.1065.21 `YSB a Page 6