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City of Arden Hills Project B2204011 June 23, 2022 Page 10 C.3. Pavements C.3.a. Reclamation Areas Based on the observed weathering and deterioration in the pavement cores extracted from Royal Hills Drive, Norma Avenue and Colleen Avenue, we recommend these streets be rehabilitated via FDR. Our scope of services for this project did not include laboratory tests on subgrade soils to determine an R-value for pavement design. Based on our experience with similar soils anticipated at the pavement subgrade elevation, we recommend pavement design assume an R-value of 15. Note the contractor may need to perform limited removal of unsuitable or less suitable soils to achieve this value. Table 5 provides our recommended minimum pavement thickness design. Table 5. Recommended Minimum Bituminous Pavement Section Material Thickness (inches) Designation Specification Bituminous Wear 2 SPWEA230B 2360 Bituminous Non-Wear 2 SPWEA230B Aggregate Base 5 Class 5 or 6 3138 C.3.b. Mill-and-Overlay The residential roads that we recommend have a mill-and-overlay performed on are: Arden Vista Court, McClung Drive, Colleen Circle, Briarknoll Circle, Briarknoll Drive, Royal Lane, and James Avenue. We recommend milling the pavement in accordance with MnDOT Specification 2232. The mill depth will vary based on conditions encountered but should be a minimum depth of 2 inches, with a replacement mix meeting SPWEA230B. Pavement depth can vary between the boring and core locations. The contractor may need to adjust the mill depth to account for unexpected conditions such as areas of thin pavement. The surface condition prior to milling can indicate where deeper repairs to the milled surface may be necessary to improve the life of the overlay. This includes distresses such as severe longitudinal and transverse cracking, alligator/fatigue cracking of any severity, potholes, edge cracking, and similar failures. MnDOT defines these distresses in their surface rating procedure as follows: