R2006-133 ACCEPTING THE BID AND AUTHORIZING A CONTRACT

Home Browse Search

The appropriation ordinance adopted by the City Council transferred $300,000 from the Olde Towne TIF Fund to the Capital Project Fund. This surplus of funds is available to be used for this project in order to make up the additional funds needed for the work. The original funding for the West Main Project was estimated in 2003. Recent construction increases related to rising fuel costs were not foreseen. Pavement Alternate Comparison The brick design will cost an additional $550,000 over the asphalt alternative. The life of an asphalt pavement can be extended a very long time with routine milling and overlay work similar to the City's annual street restoration project. On West Main Street an asphalt pavement life would range from 12 to 15 years between overlays. Maintenance in the interim years includes primarily pothole patching and crack sealing. The cost of each mill and overlay on West Main from Church to Oakland would approach $200,000. The projected life of a concrete paver surface is approximately 40 years with major maintenance occurring at around the 20 year mark. Major maintenance would include replacing broken pavers and leveling any rutted areas by removing the pavers, leveling the area, and relaying the pavers. At the end of a 40 year life expectancy it is not expected that all pavers would have suffered irreparable damage, allowing a large number to be reused thereby reducing the cost of major reconstruction. Assuming a 40 year life for a concrete paver surface, the table below provides yearly allocated costs for the major and minor maintenance activities that will occur on both asphalt and paver surfaces over that 40 year period. Multiplying the annual cost allocations by the 40 year life yields the total costs allocated. The total annual cost allocation is then added to the initial surface cost for a total projected cost. � Initial Annual Major 40 Year Total Surface Pavement Maintenance Maintenance Annual Cost Projected T e Cost Allocation Allocation Allocation Cost Brick Paver $646,000 $800 $2,500 * $132,000 $778,000 As halt $ 96,000 $3,900 $13,333 ** $689,333 $785,333 Difference -$7,333 * Patching and resetting pavers at around 20 years (approx. $100,000/40 years allocated). ** Mill and overlay every 12 - 15 years ($200,000 / 15 years allocated). Looking at the full 40 year life of the asphalt and brick paver options, the cost differential is nearly negligible for each pavement type. The broad scope of the West Main Street reconstruction provides a unique opportunity for the City to install concrete pavers. The current surface of West Main is built over a concrete and aggregate base that lends itself well to the successful installation. and operation of pavers. The significant reconstruction work along the boulevard area with the streetscape improvements will enable the street surface to be easily raised to accept pavers without major reconstruction or removal of the underlying pavement structure. Staff recommends that the alternate bids provided for brick monuments to be placed in some of the islands and on some of the side streets for the West Main streetscape along with brick bus shelters, not be accepted. It is proposed that this work be completed at a later date under a separate project. Page 2