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Feasibility Report 2021 Street and Utility Improvement Project City of St. Anthony Village WSB Project No. 015900-000 PAGE 8 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. The proposed typical sections is shown on Figure 8 in Appendix A. 4.1.5 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. 4.1.6 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. 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. 4.2 MILL AND OVERLAY IMPROVEMENTS Mill and overlay improvements are a cost effective maintenance strategy to extend the life cycle of the roadway. Mill and overlay improvements are most effective when scheduled within 15 years of original construction. Improvements along 29th Avenue and St. Anthony Boulevard include milling down the existing bituminous pavement 1 3/4-inches over the first 7 feet adjacent to the existing curb and milling the remaining roadway to a depth of 1/2-inch for the purposes of reestablishing the crown of the road. A new 2-inch wear course will then be paved over the entire street extending the pavement life of the roadway. The additional 1/4-inch will extend above the toe of curb to keep the pavement above the curb as the road settles over time. Both 29th Avenue and St. Anthony Boulevard are designated as Municipal State Aid (MSA) roadways and will be designed to MSA standards for mill and overlay improvements. Due to the poor condition of the pavement and the age of the roadways, improvements along 32nd Avenue and Croft Drive include milling the full depth of existing bituminous pavement, grading and compaction of the existing aggregate, and installation of new bituminous pavement. Both roadways are approaching 27 years in age and replacement of pavement will completely remove the deteriorated pavement while utilizing the existing aggregate and sand sections. The proposed typical sections are shown on Figure 9 and Figure 10 in Appendix A. 45