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City of Arden Hills Project B2204011 June 23, 2022 Page 11 High-severity transverse cracking: Any crack running transverse to the centerline of the roadway with significant adjacent random cracking (12 inches or more apart), have large areas of spalling, missing material and/or potholes. High-severity longitudinal cracking: Any crack running parallel to the centerline of the roadway with significant adjacent random cracking (12 inches or more apart), large areas of spalling, missing material and/or potholes. Alligator cracking: A series of interconnected cracks forming many-sided, sharp-angled pieces, 6 inches or less in size, typically located in the wheel paths and under concentrated traffic loads. We recommend an experienced engineer walk the milled surface to delineate areas for these repairs based on conditions exposed by the milling process. We recommend performing the full-depth mill to at least 1 foot beyond the edge of the visible distresses where present. A mill-and-overlay will normally have a service life of between 12 and 17 years. Over that time maintenance will be required, which may include crack seal, surface treatments, and patching. C.3.c. Pavement Materials and Compaction We recommend specifying materials based on those provided in Table 5. Bituminous pavements should generally meet the requirements of Specification 2360, which includes gyratory tests to evaluate strength and air voids and density tests to evaluate compaction. We recommend tack coat meeting MnDOT Specification 2357 be placed between the lifts and along vertical faces where paving will match adjacent pavement. We recommend compacting aggregate base to a minimum of 100 percent of its maximum standard Proctor dry density or to the requirements of the Penetration Index Method as per MnDOT Specification 2211.