01-22-07 Item 2B, Five Year CIP Update

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City of Arden Hills Budget Analysis Report May 04, 2006 Page 5 The first step in defining a prioritized work plan for the City of Arden Hills is to define the local and global pavement maintenance activities and their related costs. Local pavement repairs are those repairs that are performed on a localized area of a given pavement section (e.g., patching, crack sealing, etc.). A global pavement maintenance activity is one that is performed on the entire surface of a given pavement section (e.g., reconstruction, seal coat, overlay, etc.). Once the local maintenance policy has been established, the PCI is recalculated based on these assumptions to determine the improvement in the PCI based on the maintenance. For example, a street with an original PCI of 68 may increase to a PCI of 80 when all rutting has been patched. Every pavement section was analyzed in this way in the first year of the budget analysis. The difference between the improved and original PCI is a measure of the effectiveness of that particular type of maintenance. The ICON program attempts to find the optimal combination for routine maintenance. This may include seal coating, patching or crack/joint sealing separately or in combination. A routine maintenance strategy, consisting of patching and crack sealing, is assigned to pavements with limited amounts of low-severity cracking. Routine maintenance on pavements that are still in very good condition will help preserve the integrity of the base and prolong the life of the pavement. Overlays are used to repair pavements where local repairs such as patching are not cost effective. These pavements are in "fair" to 'poor" condition and may have low strength and/or other problems such as poor drainage. The global repair of reconstruction is recommended for pavements with extensive amounts of load-related distress. Global Maintenance Strategy The correct application of global (applied to the entire pavement section area) maintenance, repair and rehabilitation strategies is difficult to develop due to the number of variables that affect pavements. The optimum application of maintenance activities depends on the current surface condition and subgrade strength of the pavement as well as the pavement age, traffic loading and other factors. GoodPointe Technology and City staff discussed the development and application of maintenance strategies on a number of occasions to determine the analysis parameters used to derive the results of this report. Note: When a pavement section has a PCI that falls on an overlapping range between two or more global maintenance activities, an additional Life Cycle Cost (LCG) analysis is performed for each applicable strategy. The estimated amount of pavement life for each particular maintenance activity is determined and is divided by the cost to provide that life. The program then recommends maintenance activity with the highest LCC value for the given pavement section.