Minutes - Public Works Committee - 05/21/2002

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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. Below is an analysis of the cost for this for a typical one half-mile stretch of Dirt Street having 20 residences (i.e. 157th 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 1st ten years. Thereafter, annual cost would be $3,546/yr or $177/yr/unit. This analysis is based on an 8% interest rate. It was noted that this would be 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 would 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 $36,600 At 8% interest, this would be $5,453 per year over 10 years or $273/year/unit. The above cost of drainage connection, however, would cost the same in either upgrading to an acceptable gravel road or a paved road. Councilmember Kurak inquired if the estimates included the cost of staff time or would the City contract the work out. City Engineer Jankowski replied that the costs did not include the cost to periodically grade the roads, which would be necessary. Councilmember Kurak inquired if those costs should be in included in the analysis. City Engineer Jankowski replied that they could include those costs, but explained that there is some routine maintenance that occurs on both paved and dirt streets. Councilmember Kurak replied that the City does not use City equipment or City staff to do overlay or sealcoating projects on paved streets like they would to grave dirt roads, so the cost to the City would be higher on the dirt roads Principal City Engineer Olson noted that the dirt road maintenance schedule was being presented as an alternative if the Council did not want to pursue the option of having all the roads paved. Public Works Committee/May 21, 2002 Page 3 of 12