Agenda - Council - 02/13/1996 - Laserfiche WebLink

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I I I I I I I I I I I I I I I I I I BACKGROUND Routine maintenance is the most economical method for safeguarding the public investment in bituminous paved streets. The bituminous street surface weakens as a result of sunlight exposure, precipitation, freeze/thaw cycles and traffic loading. As a result, the asphaltic components of the bituminous becomes brittle and susceptible to cracking. Once water is able to penetrate surface cracks into the road base, pavement deteriorates at an accelerating pace. To avoid this rapid deterioration, it is the acknowledged goal of the City to address the maintenance needs of its street system on a periodic basis. Table 1 below provides the history of the pavements proposed for the 1996 Street Maintenance Program. The 1996 program consists of fifteen individual projects which have been aggregated by individual subdivisions. Project 96- 07 is a combination of two adjacent subdivisions which have similar lot sizes and pavement conditions. Projects 96- 06, 96-10, and 96-12 are unplatted areas having relatively simlar lot sizes. Project 96-11 consists of two platted subdivisions and unplatted lots which are all adjacent Here again, the lot sizes among the properties within the project designation are relatively similar. Two projects, Project 96-14 and Project 96-1.5 are proposed to be financed differently from the others. Project 96-14 represents a contiguous project area which have largely differing lot sizes and also includes the maintenance needs of Riverdale Drive, an extended width MSA roadway. Project 96-15 addresses the maintenance needs of 161st Lane west of County Road 83. This project is unique in that 0.65 miles of roadway has the ability to assess only eleven parcels largely due to large comer lots which had been previously assessed on the other lot frontage. Both Projects 95-14 and 95-15 are proposed to be assessed the average 1996 program unit charge. The streets scheduled for maintenance are illustrated in Exhibit A. All streets proposed for the 1996 program have received a preliminary survey by the City Engineer and Public Works Supervisor. A post winter survey will be conducted prior to awarding bids in June. Appropriate project adjustments will be made if any of the scheduled projects are deemed to be inappropriate for sealeoating due to advanced deterioration. PROJECT QUANTITIES AND COSTS Table 2 provides a detailed breakdown of street lengths, widths and pavement areas for each sealcoat project. Individual projects have been generally aggregated by subdivision such that the majority of the properties benefitted within each project have similar characteristics. Estimates are also provided for crack filling material application rates and City Public Works Department time necessary to provide the patching and preparatory work prior to the crack filling and sealcoating work. Both the sealcoating and crack filling operation will be applied by a conlractor selected through the competitive bidding process. Previous years Iow bid and estimated 1996 unit prices for sealcoating and crack filling are as follows: Sealcoating Crack Filling S/Sq. Yd. S/Lb, 1991 Actual .292 0.92 · 1992 Actual .350 0.833 1993 Actual .348 0.70 1994 Actual .315 0.699 1995 Actual .453 0.739 1996 Estimate .41 0.75 The estimated construction costs are contained in Table 3. The amount of crack filling material required is highly variable depending upon the number of cracks in the individual pavements. Based upon previous experience, and a windshield survey of streets in the 1996 program, the application rate of crack filling material was estimated for each project and is contained in Table 2.