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City of Arden Hills Project B2502087 June 13, 2025 Page 13 The project documents should not allow the contractor to use frozen material as engineered fill or to place engineered fill on frozen material. Frost should not penetrate under foundations during construction. C.3. Full-Depth Reclamation We understand that the FDR is proposed for the areas presented in Table 5. For the proposed FDR on the residential streets, for reuse of pavement materials by reclamation, we recommend a 10-inch FDR for most of the project streets. Due to the thinner pavement section and clayey subgrade, we recommend the FDR depth be reduced to 8 inches on Karth Lake Circle, Amble Circle, and Pleasant Circle between Lexington Avenue and Pleasant Drive. To place the full aggregate base section in these areas, an additional removal of 2 inches of subgrade material may be needed. Based on the measurements from the borings and pavement cores, this generally will avoid subgrade soils. If there are areas where subgrade may be penetrated due to a thinner pavement section, we recommend reducing the mill depth to the top of subgrade and excavating to the design depth of the pavement section. We recommend implementing through quality control practices, including frequent sieve analyses, to achieve a desirable gradation of the reclaimed material. The gradation requirements of MnDOT Specification 2215 (Reclamation) or Specification 3138 (Aggregate for Surface and Base Courses) can be used for the aggregate base; the latter specification’s controls on gradation and asphalt content are stricter and will generally be more difficult to meet. We suggest the contractor assume some contingency for importing clean, crushed rock that can be blended with the reclaimed material to improve the uniformity of the resulting gradation prior to reuse as an aggregate base. For the Karth Lake Trail, we understand the intent was to reclaim the trail and repave. Understanding the trail had limited pavement and aggregate base present, we recommend stripping the pavement adding additional aggregate to the existing apparent aggregate base and then placing new pavement for the trail. See section C.5 for recommendations with regards to the trail. C.3.a. Full-Depth Reclamation Preparation We recommend the following steps for pavement reclamation preparation, understanding the new pavements will match existing grades. 1.Reclaim the pavement as recommended under Section C.3., stockpile and/or redistribute excess reclaim material as necessary to construct the new pavement sections.