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City of Arden Hills Budget Analysis Report May 04,2006 Page 3 Budget Analysis . Develop a multi-year network level budget analysis The City has requested that GoodPointe Technology perform a number of budget scenario projections to obtain a general idea of how the City pavement network is changing with time, given the best available information from the street condition survey, Arden Hills pavement performance data, pavement maintenance, repair, and rehabilitation unit cost data and general budget provisions of the City. Process Summary With the ICON software, GoodPointe Technology used the pavement performance data to project the condition of the PCI into the future and to calculate the amount of deferred maintenance, repair, and rehabilitation work (backlog) present in the network in each year of the 30-year scenarios included in this report. From an engineering perspective, the correct application of future pavement projects depends on the sequence of historical projects that have already been applied. The budget module of the ICON program utilizes historical project-related data (seal coats, overlays, reconstruct information) to qualify or disqualify certain projects from being recommended in a given budget scenario run. For a particular alternative or strategy, the user specifies: 1) The condition index (CI) score range for which the strategy will be considered; 2) The maximum number of applications the strategy can be applied successively . before a new strategy must be recommended; 3) The time interval (in years) between successive applications of the strategy; and, 4) The unit cost of the treatment and the category to which the strategy belongs. At the start of a budget scenario, ICON wiillook for the most recent historical condition surveyor project related information and will deteriorate the score from that historical date to the date of the analysis. ICON then filters through the historical project information to determine how many times each particular strategy has been applied successively and what the time interval has been since the last strategy. With this historical information in mind, ICON performs the life cycle cost analysis to determine the optimum way to spend your budget in the future given the practical constraints of how your strategies need to be programmed. A practical constraint associated with running budget analysis scenarios involves the amount of budget that is allocated to the different categories of pavement maintenance, repair, and rehabilitation (seal coat, overlays, reconstructs). Care must be taken not to allocate too much money to a given category (e.g. sealcoats), if it exceeds the realistic amount of seal coat projects that the City is able to contract and manage, for example. Development of Maintenance Strategies The optimal combination of maintenance methods is the one that provides maximum benefit for the least cost. The following figure illustrates an example of how the maintenance benefit can be derived. .