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R-3 <br /> <br />SECTION 2 <br />PAVEMENT REHABILITATION <br /> <br /> <br />2.1 BACKGROUND <br /> <br />Watertown road carries local traffic east-west and generally parallels the <br />alignment of TH 12 between McCulley Road and the East limits of Orono (near <br />Harrington Dr). The proposed project would rehabilitate Watertown Road from <br />approximately McCulley Road, to a point 500’ East of Willow Drive where the <br />boundary of Orono shared with Long Lake divides Watertown Road. This street <br />is designated a Municipal State Aid route from McCulley Road to Willow Drive. <br />The existing street varies in width from 22.5-feet to 27.5-feet, but is generally 24- <br />feet wide. The bituminous varies in depth from 2.5-inches to 14-inches. The <br />street section in this area is rural, and stormwater is conveyed through adjacent <br />ditches and culverts. There are a number of culverts that cross and parallel <br />Watertown road. There are no other utilities located under the pavement. <br /> <br />Soil borings had been performed by STS Consultants at various intervals to <br />determine the pavement and subgrade thickness in 2006. The low number of soil <br />borings that were completed and the high variability in pavement depths <br />prompted further investigation for the purposes of this study. American <br />Engineering and Testing was hired to perform a Ground Penetrating Radar (GPR) <br />assessment of the existing pavement depths and underlying subgrade section. The <br />full report is attached in Appendix A. <br /> <br />2.2 STREET IMPROVEMENTS <br /> <br />After reviewing the GPR assessment two alternatives have been considered. <br />• 1-inch mill of existing pavement and a 3-inch to 4-inch bituminous <br />overlay (estimated life of 10-years, approx. $1,100,000 cost ) <br />• Full depth reclaiming of existing pavement and a 4-inch (min.) bituminous <br />pavement section (estimated life of 20-years) <br />Based on an estimated life of 10-years, a mill & overlay is not recommended as <br />the preferred alternative. While a mill & overlay would cost less, the large degree <br />of alligator cracking and pavement distresses that result in the poor ride currently <br />experienced on Watertown Road would reflectively show through a mill &