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

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Deferred Maintenance Backlog An important factor in evaluating budget scenarios is deferred maintenance. Deferred maintenance is work that could not be done in a given year of the analysis period due to lack of funding. It represents work that is delayed until additional funds can be found. The monetary result of deferred maintenance is maintenance backlog. In the budget analysis of this report, the maintenance backlog for a given year is defined as the cost for the City to repair all the pavements in that year. As the average network PCI decreases, the cost to repair pavements rises. As the pavements approach the poor category, the cost of rehabilitation rises due to the large amount of individual distresses that require repair. The following figure illustrates the general relationship between the increasing cost of rehabilitation maintenance and decreasing pavement condition for Arden Hills pavements. It is based on our experience with urban pavements like those of the Arden Hills pavement network, but does not use actual Arden Hills pavement data. Typical City Streets Maintenance Cost and Condition vs. Age Pavement Condition Pavement Rehab cost ($/sq. ft.) 100 80 60 40 20 o o 10 20 30 40 Age of Present Surface (years) Figure 4 $5 $4 $3 $2 $1 $- As the pavements approach the poor category, the cost of rehabilitation rises sharply. If preventive maintenance is not emphasized now, the bulk of the pavement network will rapidly decline in condition. A considerable amount of heavy maintenance at a high unit cost will be needed later to regain the original current condition of the pavement network. The labor-intensive effort required for heavy spot repairs would most likely put a burden on City staff. The actual cost of the deferred backlog would rise, resulting in a decreasing annual average pavement condition.