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City of Hugo 9/6/2022 Page 4 Recommendations for Rehabilitation: Based on the conditions of the existing bituminous and subsurface data gathered by WSB, we are recommending the reconstruction technique below be considered. Pavement thicknesses do not allow for a mill and overlay option due to shallow pavement depths. We recommend full depth pavement removal and replacement. This would entail of the complete removal and disposal of the existing bituminous pavements. The underlying base should be compacted, shaped and proof rolled immediately prior to bituminous paving. In general, existing aggregate base appeared to be finer than typical requirements for MnDOT Class 5 aggregate base. Additional clean coarse gravel could be added and blended in to existing aggregate base. The deciding factor between these possible options may be largely dependent on the price differences at the time of bidding, project timelines and contractor availability. We would expect both options presented will provide a long-term solution with similar maintenance requirements and total life expectancies. Key Considerations: The import or export of any excess base aggregates associated with the recommended rehabilitation techniques should be considered. The quantity will be highly dependent on designed profiles and structure limitations such as utility structures and any adjacent curb/gutter or driveway tie in elevations. Any unstable base soils discovered during a proofroll would likely require sub cutting and replacement. Potential costs associated with these corrections should be anticipated. Pavement Design: The new bituminous pavement section and mix type should be designed and specified by a Civil Engineer in consideration of the loads, climate, desired life expectancy and other key factors. Limitations: The field data presented should be considered approximate and only valid for the location investigated. We have assumed smooth transitions of the similar materials between locations when formulating the recommendations provided. Our recommendations are based solely on the data obtained through our limited field investigations and our experience with similar reconstructive and rehabilitation work for the locale. We consider local contractor experience and industry costs associated with the various rehabilitation techniques available in conjunction with project specific details. Appendix: • Photographs of Cores • Photographs of Existing Surface Conditio