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2019 STREET AND UTILITY IMPROVEMENT PROJECT FEASIBILITY REPORT CITY OF ST. ANTHONY VILLAGE WSB PROJECT NO. R-011648-000 PAGE 5 Drainage Improvements Reconstruction of the roadway provides the City an opportunity to review and assess the condition of the existing infrastructure. Existing utilities located along County Road C (29th Avenue NE) include 9-inch vitrified clay pipe (VCP) sanitary sewer main along the north side of the roadway, 6-inch cast iron pipe (CIP) watermain along the north side of the roadway, 12-inch ductile iron pipe (DIP) trunk watermain along the south side of the roadway, and 12-inch to 36- inch RCP storm sewer main along the south side of the roadway. The existing storm sewer will be reconstructed to address drainage concerns and localized ponding/flooding. The cost participation for the drainage improvements is calculated based on the contributing drainage areas, estimated to be 75% City. The existing drainage was also reviewed within the industrial park, located south of County Road C (29th Avenue NE). Currently, various buildings within the industrial park experience flooding during common rain events (2-year). The existing roof drainage and limited adjacent storm sewer does not provide adequate storm conveyance and storage from the industrial park. A filtration system was constructed in 2017, located on the eastbound sided of County Road C (29th Avenue NE), just east of the Municipal/County boundary. The outlet control structure on this filtration system is not preforming as designed. This filtration system is discharging water southwest between buildings, onto Anthony Lane S, before making its way to the flood pond. Improvements proposed to alleviate the flooding concerns within the industrial park include reconstructing the existing outlet control structure of the filtration system to discharge west down the County Road C (29th Avenue NE) ditch. Drainage patterns would remain and prevent stormwater from flowing between buildings and over Anthony Lane S. Additionally, expansion of the existing flood pond located between the cemetery and the industrial park will provide additional stormwater storage and prevent flooding of the industrial are during larger rain events (100-year). A map illustrating the proposed storm sewer improvements along County Road C (29th Avenue NE) can be found on Figure 4 of Appendix A. A map illustrating the available right-of-way adjacent to the industrial park and the location of the drainage and flooding improvements can be found on Figure 6 of Appendix A. Municipal Utility Improvements Existing 6-inch CIP is proposed to be replaced with 8-inch DIP, including the replacement of water services up to and including the curb stop. Services will be replaced with 1-inch to 1.5-inch copper service pipe and curb stops brought to the right-of-way. All existing water main in the project area will be equipped with new valves and hydrants as necessary for proper operation and fire protection. The cost participation for the watermain improvements will 100% funded by the City. The existing VCP sanitary sewer will be reconstructed with 8-inch polyvinylchloride (PVC) pipe, including the replacement of sanitary sewer services. All services are proposed to be replaced with 6-inch PVC service pipe from the sewer main to the right-of-way. Replacing aging trunk utility facilities at the same time as the road construction is a proactive means by which to mitigate future maintenance costs. The cost participation for the sanitary sewer improvements will 100% funded by the City. A map illustrating the proposed utility improvements can be found on Figure 4 of Appendix A. 67