02-10-2014 Council Minutes - Laserfiche WebLink

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MINUTES OF THE ORONO CITY COUNCIL MEETING Monday, February 10, 2014 7:00 o’clock p.m. _____________________________________________________________________________________ Page 21 of 30 (10. WATERTOWN ROAD FEASIBILITY STUDY – PRESENTATION, Continued) Martini displayed pictures of the existing roadway. Martini noted some erosion is occurring in areas along the edge of the roadway. Martini indicated Bolton & Menk worked with American Engineering and Testing, who performed a ground penetrating radar assessment of the existing pavement depths and underlying subgrade. Based on the analysis of both the borings and the GPR, it was determined a full depth reclaiming would be the best value rehabilitation process for the entire length of Watertown Road. Bolton and Menk did analyze a one-inch mill and overlay option which involved milling one inch an overlaying with three to four inches of new asphalt. While this is a potential option, this process will only provide an estimated life of approximately10 years and does not address areas of subgrade failures. Martini stated by using the full depth reclaim method, that will help to strengthen the subgrade and will allow areas to be reconstructed where there is subgrade failure. It also provides additional the life expectancy of the road. Martini stated if the road is regularly maintained, this process may provide up to three times the life expectancy of a mill and overlay. Martini noted this project is currently scheduled in the Capital Improvement Plan as a 2015 project. In considering those two options and the significant investment the City would be making, the recommendation would be to go with the full depth reclamation. In those areas that appear to have some subgrade issues, the excavation would be down to the subgrade. Martini stated he would also recommend the City replace the drainage structures to match the life of the road. Martini indicated the City is allowed to have a maximum of 20 percent of the underlying subgrade reconstructed before the City would have to meet state aid standards. As it relates to Willow Drive, the conditions of the roadway required it to be fully reconstructed, which triggered the state aid. In this case, given the recommendation, it would be under that 20 percent. Martini indicated they could essentially rehabilitate and start with a new pavement structure without triggering the state aid requirements. Martini noted the report only briefly touches on the east end of the project that is shared with Long Lake. Martini indicated they have had conversations with Long lake and it is his understanding they are considering improvements within their city limits. Martini stated while he is not exactly sure on the method of financing Long Lake would use, it is a possibility that they would consider assessments to the benefitting properties. Martini stated in his view it would be appropriate for the portion that is shared between the two cities that Long Lake take the lead on that project. Martini stated they do have some geotechnical information for the east side of Willow Drive that indicates the road could be reclaimed on the east side of Willow Drive as well but that would require some confirmation with Long Lake to make sure that is a viable option.