08-08-2016 Council Packet - Laserfiche WebLink

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R-6 Figure No 1 shows several locations with bollards that will be replaced with guardrail and safety end treatments, and Figure No 2 shows the storm sewer and culvert crossings that are proposed to be replaced, with the exception of the Long Lake Creek Box Culvert, which we propose to leave in place as part of this project. 2.3 ANALYSIS OF ALTERNATIVES As part of the pavement and geotechnical analysis, we have examined several rehabilitation methods including: full-depth reclamation, mill and overlay pavement reconstruction (recondition) and complete reconstruction including shoulder widening. Sections A & B are in poor condition with patches, rutting, and raveling occurring along both stretches. This is at least partially due to the wide variability in bituminous and aggregate base depths. Pavement reconstruction (‘‘Reconditioning’’) and Full Reconstruction are the alternatives that best address issues with underlying aggregate base. Factoring in the traffic volumes and geographic location within the City, it has been determined that performing pavement reconstruction would provide the city with the greatest return on investment for these sections. Additionally, we propose to reconstruct Section B in accordance with MSA Reconditioning standards to allow the city to utilize their MSA funds for the project. Section C was discovered to contain a high concentration of organic deposits in the geotechnical investigation. Our analysis indicates that a mill and overlay would provide an improved pavement surface and eliminate some of the mass of the roadway on the underlying swamp deposits the road rests on (pavement thicknesses up to 18.75-inches) which is likely exacerbating the settlement and pavement distresses. Mill and overlay allows for a better drivable surface without the cost of digging down to fully remove the swamp deposits to an unknown depth.