Agenda Packets - 2008/04/28 - Laserfiche WebLink

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There are two primary methods of repair Staff feels are available. The first, less expensive method would be to mill off the existing bituminous wear course from the affected areas and replace it with new bituminous wear course. While we have not performed a detailed cost estimate for the repair, we anticipate the estimated cost of making this type of repair would be on the order of $13,000. The second method of repair would be to remove the entire thickness of bituminous surfacing on each approach lane and to construct a new concrete pavement section in its place. The concrete section would be more resistant to the “rippling” of the surface. However, the cost of the concrete surface repair would likely be at least 2 – 3 times the cost of the bituminous repair. County Road H2 was reconstructed to Minnesota Department of Transportation State Aid Standards in 2002. Given that the need for a thicker concrete pavement section at that location was not identified in that design, and unless the City is aware of a history of this phenomena at this location, our opinion is that the more expensive concrete repair is not warranted at this time. Our recommendation would be that if a repair is done it be the less expensive bituminous repair. The location could be monitored, and if the situation occurs again within a relatively short period of time (within 6 to 8 years), investigation could be done into a different method of repair. The City also has the option of performing no repair to County Road H2 at this time. Seal coat can still be applied to the area in its present condition, although it is possible that the material will not adhere as well and may be less durable than at other locations within the project due to the unevenness of the surface. If the City is interested in pursuing the bituminous repair, our recommendation would be to include it in the 2008 Street Maintenance Project as an alternate to the bid. Using that approach, the City could decide whether or not to proceed with the repair based on the construction bids received. If favorable bids are not received, the City could choose to not accept the alternate, and instead plan on the repair for a future time. Including the County Road H2 surface repair as an alternate in the bid would require modification of the plans and specifications beyond the original scope authorized by the City Council. We estimate the cost of the modifications to be approximately $1,500. Budget –The adopted 2008 budget has $215,000.00 allotted for this project: x $170,000 in the Street Improvement Fund (account 285-4470- 7050) for the overall project, including City Hall parking lot. x $23,000 in the Special Project Fund (account 280-4180-7050) for the Mounds View Community Center parking lot. x $22,000 in the Park Dedication Fund (account 251-4470-7050) for Silver View and Greenfield Park parking lots.