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2017 STREET AND UTILITY IMPROVEMENT PROJECT FEASIBILITY REPORT CITY OF ST. ANTHONY VILLAGE WSB PROJECT NO. 2170-34 PAGE 7 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. Twleve 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. Penroad Lane, Skycroft Drive, Maplewood Drive, and Chelmsford Road are existing concrete 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. Improvements along Silver Lake Court include milling down the existing bituminous pavement 1 3/4-inches along the full width of the roadway. A new 1 3/4-inches wear course will then be paved over the entire street extending the pavement life of the roadway until the road can be reconstructing in the future. The proposed typical sections are shown on Figure 7 in Appendix A. 4.5 Permits and Approvals Reconstruction of the roadways will disturb over one acre and will require a National Pollution Discharge Elimination Systems (NPDES) General Storm Water Permit (MNR 100001) that must be obtained by the City of St. Anthony Village from the Minnesota Pollution Control Agency (MPCA). The reconstruction of the existing water main will require a permit from the Minnesota Department of Health. The reconstruction will also require a permit from the Rice Creek Watershed District (RCWD). This may require stormwater treatment for the runoff from the project area. 4.6 Detour Routes The project will require significant excavation and disposal of unacceptable material from the existing street area and a supply of significant volumes of select granular base, aggregate base, and bituminous pavement materials. This effort will require closing the roads under construction and increasing loaded truck traffic on the streets adjacent to the construction area. Adequately signed detours will be identified to direct traffic around the construction zones and notify users of the increased truck and construction activity. In order to accommodate the property owners along the excavated roads, temporary parking on the adjacent streets may be necessary during the periods when vehicle access is not possible. 25