Agenda - Council - 04/08/2003 - Laserfiche WebLink

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-302- A second method of comparing the relative costs of the two types of street maintenance which would more accurately reflect the actual costs experienced i n t he past could b e based on analysis of benefit the City contributes per unit on an annual basis. Attached are unit benefit analysis for both dirt and paved streets. These analysis shows that over the last nine year period the contribution of the City on a per unit basis for dirt streets has been 178% of that for paved streets. In the future this unit benefit for dirt streets would be expected to remain constant (excluding inflation). The future trend for paved streets is somewhat more difficult to predict. On one hand, the increasing number of overlays will cause this unit benefit to increase. Conversely, the increasing percentage of smaller sized lots, which consequently require smaller amounts of pavement per unit, will tend to lower the benefit. Dirt Street Maintenance Program: It was suggested that a dirt street maintenance program similar t o t hat used for paved streets be considered. The existing practice of grading dirt street periodically is not providing an acceptable level of service on these roads based on the frequent complaints received from residents on these roads. Providing a good level of service on an unpaved road might be obtained by placing four inches of Class 5 combined with applying a dust control annually. Thereafter, a two inches of Class 5 might be required every 5 years. BeIow is an analysis of the cost for this for a typical one half-mile stretch of Dirt Street having 20 residences (i.e. 1 57th Avenue). The costs associated with this would be as follows: 1st year 1480 tons Class 5 ~ 7.50/in. = $11,100 Each year 7040 yd2 Dust Control ~0.30/yd2 = $ 2,112 Every 5 years 740 ton Class 5 ~ 7.50/in. = $ 5,050 An annual cost of $4,446 per year or $222/unit/year would be required to address these costs for the Ist ten years. Thereafter, annual cost would be $3,546/yr or $177/yr/unit. This analysis is based on an 8% interest rate. It should be noted that this is a rather substantial cost, and does not allow for drainage connections which are needed on several of the existing dirt streets. For example, the eastern end of 157th Avenue is lower than the existing grade so that water ponds in the roadway. To bring this roadway up to a truly acceptable standard, the same drainage connection that wguld be required for the street, if it were paved, should be undertaken to provide a well functioning gravel street. As a point, of comparison, to pave this same roadway would require the following expenditure: 1480 tons Class 5 ~ $7.50/ton = $11,100 850 tons Bituminous ~ $30/ton = $25,500 $36,6O0 I I I i I I I