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City of Ramsey <br />Project B1705491 <br />August 11, 2017 <br />Page 10 <br />D.1.c. Design Sections <br />Lal,u, U«,1 y iLsts to determine an R-value for pavement design were not included in the scope of this <br />project. Given the most common soils in the top 5 feet of pavement sections, which include poorly <br />graded sand with silt and poorly graded sand, we recommend using an R-value of 50 for pavement <br />thickness design on all three projects. <br />Based upon the assumed traffic loads and an R-value of 50, we recommend a new pavement section for <br />the 2018-2019 Street Reconstruction Projects meet the minimum thicknesses presented in Table 7. <br />Table 7. Recommended Bituminous Pavement Thickness Design (Areas A, B and C) <br />Thickness <br />Layer (in.) MnDOT Specification/Designation <br />Bituminous Wear 1 1/2 (1 lift) SPWEA240C <br />Bituminous Non -wear 2 (1 lift) SPNWB230C* <br />Aggregate Base (Class 5 or 6) 6 3138 <br />or Reclaim 3135 <br />*For small quantities, SPWEA240C can be used for the entire thickness. <br />The above pavement design is based upon a 20-year performance life. This is the amount of time before <br />major reconstruction is anticipated. This performance life assumes maintenance such as seal coating and <br />crack sealing is routinely performed. The actual pavement life will vary depending on variations in <br />weather, traffic conditions and maintenance. <br />D.1.d. Materials and Compaction <br />We recommend specifying pavement materials as recommended in Table 6. <br />We recommend compacting the aggregate base or reclaim materials to meet the requirements of <br />MnDOT specification 2211.3.D.2.c. (Penetration Index Method). We recommend compacting bituminous <br />to at least 92 percent of the maximum theoretical Rice density per the Maximum Density <br />Method (specification 2360.3.D.1), with bituminous materials and placement practices meeting the <br />requirements of MnDOT Specification 2360. <br />BRAUN <br />INTERTEC <br />