#05 - Pavement Management Program

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Prepared by: Bolton & Menk, Inc. Pavement Management Plan ǀ City of Lake Elmo Page 7 the renewed recycled base. The procedure not only replaces the top bituminous surface, but also results in a renewed homogenous base material to a limited depth, thereby increasing the structural capacity of the pavement section. Because the underlying in-situ soils remain below the renewed aggregate base, the same distresses are likely to eventually work back into the new pavement section, limiting the useful service life of the reclaim to 20-25 years. Completing this procedure when no storm sewer improvements are needed and when curb and gutter replacement is not needed, will provide the city with a highly effective and cost-efficient rehabilitation technique for its pavement management program in the years to come. This will become the go-to rehabilitation technique when today’s newer streets are ready for rehabilitation. FULL DEPTH RECLAMATION WITH NEW CONRETE CURB AND GUTTER. The FDR rehabilitation technique is currently being employed, when feasible, for the city’s aged street network (open space and rural estate neighborhoods), however, the improvements are being completed at a much higher cost per square foot than the typical FDR process. This is due to the fact that the older neighborhoods were constructed with limited storm sewer and drainage provisions and with either bituminous curb or no curb at all. The project results in the improved pavement section with a useful service life of 20-25 years, but also improves the storm sewer drainage system and adds new concrete curb and gutter to improve drainage and provide structural support for the edge of the paved streets. RECONSTRUCTION. Reconstruction is defined as any major rehabilitation involving the removal or relaying of all pavement layers including the bituminous surface, aggregate base and subbase materials. Current city standards require a full depth engineered pavement section that includes a sand subbase drainage layer with drain tile provisions to protect the new roadway from future frost heave failures. Pavement sections are reconstructed to a minimum depth of 2-ft for 7-ton low-volume streets and to a minimum depth of 3-ft following utility installation or along high-volume collector streets. Reconstruction is performed on streets that have deteriorated to the point where reconstruction is the only cost-effective method of rehabilitation. However, street reconstruction is also required when major utility installation is needed along the street segment, whether the utility is for the extension of public watermain, extension of sanitary sewer service, or for major storm sewer systems.