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2020 STREET AND UTILITY IMPROVEMENT PROJECT FEASIBILITY REPORT CITY OF ST. ANTHONY VILLAGE WSB PROJECT NO. R-011648-000 PAGE 4 4. PROPOSED IMPROVEMENTS 4.1 Sanitary Sewer The existing 9-inch VCP 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 proposed sanitary sewer improvements are shown on Figure 4 and Figure 5 in Appendix A. 4.2 Water Main Existing 6-inch CIP and 4-inch DIP 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 up to the right-of-way with the appropriate 2-inch copper service pipe. All existing water main in the project area will be equipped with new valves and hydrants as necessary for proper operation and fire protection. Replacement of existing services will alleviate head loss and increase water pressure to properties by providing a clean service pipe. The proposed water system improvements are shown on Figure 6 and Figure 7 in Appendix A. 4.3 Storm Sewer Reconstruction of the road provides the opportunity to improve drainage in the area with the installation of additional storm sewer facilities. The existing storm sewer system will be improved with the addition of catch basins along the roadway to better accommodate area drainage and the extension of new storm sewer where facilities do not currently exist. The proposed storm sewer improvements are shown on Figure 8 and Figure 9 in Appendix A. 4.4 Street Reconstruction of the existing street is intended to improve the design strength of the pavement system and provide a street surface with an extended life for the City of St. Anthony Village. Roadways are proposed to be replaced at their current width from back-of-curb to back-of-curb, which allows for two 12-foot driving lanes and 2-foot reaction areas on each side of the street. After the subgrade excavation is completed in the streets, a geotextile fabric will be placed to separate the existing underlying soft materials from the granular materials. Twelve inches (12”) of select granular material or "sand cushion" will be placed on the geotextile fabric to provide a firm base for the eight inches (8”) of Class 5 aggregate base and four inches (4”) of bituminous asphalt pavement. These streets will be replaced with bituminous asphalt pavement per City Council Resolution 07- 022. The decision was reached following the outcome of the Street Reconstruction Task Force report presented on November 13, 2007. Additional improvements include removing and replacing the existing block retaining wall located at the northwest end of the cul-de-sac on Silver Lake Terrace. The existing 8-foot retaining wall is beginning to lean away from the roadway causingseperation in the adjacent driveway. The retaining wall is proposed to be removed and a new large block wall installed. 101