02-24-1999 Council Agenda - Laserfiche WebLink

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Mr. Joel Hanson February 19, 1999 Page Two cold -in -place recycling. County data would indicate that the life expectancy for a cold -in- place recycling project would be on the order of 12 to 15 years, dependant upon the amount and kind of traffic. If, at the end of this period, the road is deemed to need total reconstruction, it will not be possible to save the concrete curb and gutter. In a total reconstruction project, the life expectancy of the road is deemed to be 20 years and beyond, however, at the end of that 20 year period, any additional work would not involve total reconstruction but rather a refurbishing of the bituminous surfacing thus allowing the concrete curb and gutter to remain in place. Therefore in a total reconstruction, the life expectancy of the concrete curb and gutter could be estimated at 40 years and beyond. • The next issue we would raise for consideration is really a side issue to this project. These County turnbacks will be placed on the City's Municipal State Aid system (MSA). If the projects are just recycled by the County and left in that fashion they would go onto the City's MSA system as needing total reconstruction at some point in the future. Annually, this classification would generate the most MSA construction funds for the City. If, however, the new concrete curb and gutter is placed along these roads, we believe the Office of State Aid would classify these roads as being reconstructed and meeting State Aid design criteria. The "needs" for the road would be substantially reduced in this category thus lower the amount of MSA construction funds that the City receives for them annually. This presents a double -edged problem. First, if the curb and gutter is placed along the recycled project and the life expectance is approximately 15 years at which time full reconstruction is needed and the Office of State Aid deems that initially they are reconstructed thus lowering the needs, the result would be that in 15 years when the City goes to reconstruct them they will have received no MSA construction funds to help pay for this reconstruction. • We have discussed the option of not installing the concrete curb and gutter with Mr. Brad Linderman of Barr Engineering, the engineer for the watershed. It is our understanding that if concrete curb and gutter is not installed the County will install bituminous curb and gutter where possible. Brad has indicated that his storm drainage design along County Road B2 will function adequately with either type of curbing. • The last point would be the pros and cons of concrete curb and gutter verses bituminous curbing. Obviously the concrete curb and gutter will be much more durable whereas the bituminous curb and gutter can be harmed or often times virtually destroyed by snowplowing operations. From a drainage standpoint either one of the two types of curbing will provide adequate drainage along the edge of the street. I believe that either type of curb will protect the edge of the roadway from rapid deterioration. Aestheticly, the concrete curb and gutter probably provides a more finished look and a better long lasting appearance. Maintenance costs would likely be slightly higher over the life of the road with bituminous curbing. Howard ° r'r n f^moany CO Page 11