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City of Arden Hills <br />Project B2502087 <br />June 13, 2025 <br />Page 14 <br />2.Once the roadway section is cut to grade, have a geotechnical engineer or their <br />representative observe the top of reclaim material (and/or subgrade if material below <br />reclaim becomes exposed or wet) to evaluate if additional improvements are necessary. <br />C.3.b. Full-Depth Reclamation Design Section <br />For the FDR process, the pavement should generally follow Table 7. <br />Table 7. Proposed Bituminous Pavement Section <br />Material <br />Thickness <br />(inches) Material Material Specification <br />Bituminous wear course 1 1/2 SPWEA340C MnDOT 2360 <br />Bituminous wear course 2 1/2 SPWEB330C MnDOT 2360 <br />Aggregate base 6 Reclaim* MnDOT 2215 <br />Aggregate base Varies --- Residual aggregate base <br />Approved subgrade --- --- --- <br />*Where reclaim is removed for spot utility repair, material specification will generally follow MnDOT 2211, class 5 material. <br />C.3.c. Bituminous Pavement Materials and Compaction <br />We recommend that the bituminous wear and non-wear courses meet the requirements of <br />Specifications 2360. <br />We recommend compacting the aggregate base to meet the requirements of MnDOT Specification <br />2211.3.D.2.c (Penetration Index Method for the dynamic cone penetrometer [DCP]). We recommend <br />compacting bituminous pavements to at least 92 percent of their maximum theoretical (Rice) density. <br />C.3.d. Performance and Maintenance <br />We based the above pavement designs on a 20-year performance life for bituminous. This is the amount <br />of time before we anticipate the pavement will require reconstruction. This performance life assumes <br />routine maintenance, such as seal coating and crack sealing. The actual pavement life will vary depending <br />on variations in weather, traffic conditions and maintenance. <br />Many conditions affect the overall performance of pavements. Some of these conditions include the <br />environment, loading conditions and the level of ongoing maintenance. With regard to bituminous <br />pavements in particular, it is common to have thermal cracking develop within the first few years of <br />placement and continue throughout the life of the pavement. We recommend developing a regular <br />maintenance plan for filling cracks in exterior slabs and pavements to lessen the potential impacts for <br />cold weather distress due to frost heave or warm weather distress due to wetting and softening of the <br />subgrade.