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City of Hugo <br />10/21/2024 <br />Page 3 <br />Summary of Field Exploration: <br />The 17 cores obtained is this area had bituminous depths ranging from 2.5 inches to 5.5 inches, <br />with a wear or top lift ranging from 1 inch to 2.75 inches, and a base layer ranging from 1.5 inches <br />to 2.75 inches. The condition of each core and it’s apparent lifts of asphalt were classified based <br />on condition, and the condition of the cores and lifts ranged from poor to good condition with poor <br />cores exhibiting excessive raveling and cracking. The aggregate base appeared to be sand with <br />various amounts of gravel, brown or light brown in color, and at all locations was 10” or greater in <br />depth. The subbase in general was identified as fine-medium grained sand, brown in color. The <br />pavement in the Project Area exhibited various amounts of alligator cracking, patching, surface <br />stripping and transverse and longitudinal cracking throughout. Refer to field notes for more <br />detailed distresses for each sample location. <br />Our Field Data is further detailed in the Appendix. <br />Recommendations for Rehabilitation: <br />Based on the conditions of the existing bituminous and subsurface data gathered by WSB, we <br />concur with the recommendations proposed by the City for mill and overlay reconstruction. This <br />would involve grinding off a portion of the in-place asphalt surface and replacing it with a new <br />bituminous wearing course over the entire surface. A mill and overlay may only eliminate some of <br />the surface distresses, thus it is common to see cracks reflecting through the new pavement <br />within a few years. However, this option provides a new driving surface while utilizing the existing <br />lift in the bottom portion of the pavement. It is important to note that additional patching would be <br />anticipated on areas with thinner or poorer bituminous that may be encountered once the surface <br />is milled. WSB can provide additional information on best practices for mill/overlay and pavement <br />replacement projects if needed. <br />Key Considerations: <br />The import or export of any excess base aggregates associated with the recommended <br />rehabilitation techniques should be considered. The quantity will be highly dependent on <br />designed profiles and structure limitations such as utility structures and any adjacent driveway tie <br />in elevations. <br />Any unstable base soils discovered during a test roll would likely require sub cutting and <br />replacement. Potential costs associated with these corrections should be anticipated. <br />Pavement Design: <br />The new bituminous pavement section and pavement mix type should be designed and specified <br />by a Civil Engineer in consideration of the loads, climate, desired life expectancy and other key <br />factors. If requested, WSB can provide a pavement design for this project.