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<br /> . Deferred Maintenance Backlog <br /> An important factor in evaluating budget scenarios is deferred maintenance. Deferred <br /> maintenance is work that could not be done in a given year of the analysis period due to <br /> lack of funding. It represents work that is delayed until additional funds can be found. <br /> The monetary result of deferred maintenance is maintenance backlog. In the budget <br /> analysis of this report, the maintenance backlog for a given year is defined as the cost <br /> for the City to repair all the pavements in that year. <br /> As the average network PCI decreases, the cost to repair pavements rises. As the <br /> pavements approach the poor category, the cost of rehabilitation rises due to the large <br /> amount of individual distresses that require repair. The following figure illustrates the <br /> general relationship between the increasing cost of rehabilitation maintenance and <br /> decreasing pavement condition for Arden Hills pavements. It is based on our <br /> experience with urban pavements like those of the Arden Hills pavement network, but <br /> does not use actual Arden Hills pavement data. <br /> ,------ ..-------- --- -----.. ..-....-- -... .. ..---.--.... ..._~ <br /> I Typical City Streets <br /> i <br /> I <br /> Maintenance Cost and Condition vs. Age <br /> Pavement Condition Pavement Rehab cost ($/sq. ft.) <br /> 100 ...-..- ....-----.. J $5 <br /> I <br /> . 80 "------- -L-I $4 <br /> i <br /> I <br /> ; I <br /> hn i <t~ <br /> , .___ .. _.__m_ <br /> 1."--- -+,V I <br /> 'VV' I <br /> t- i $2 <br /> 40 ____n_.____.. I I <br /> -I <br /> I j I <br /> I i $1 <br /> 201----- i I <br /> I <br /> I i <br /> I <br /> 0 .. -------- ______._1 $- <br /> 0 10 20 30 40 <br /> i <br /> ; <br /> I <br /> Age of Present Surface (years) J <br /> L ...--- -..--... ...--- ..... --- -.--..-------.-- ...._ __ .n .n _.._.. <br /> Figure 4 <br /> As the pavements approach the poor category, the cost of rehabilitation rises sharply. If <br /> preventive maintenance is not emphasized now, the bulk of the pavement network will <br /> rapidly decline in condition. A considerable amount of heavy maintenance at a high unit <br /> cost will be needed later to regain the original current condition of the pavement <br /> network. The labor-intensive effort required for heavy spot repairs would most likely put <br /> a burden on City staff. The actual cost of the deferred backlog would rise, resulting in a <br /> . decreasing annual average pavement condition_ <br />