Agenda - Council - 03/22/1994 - Laserfiche WebLink

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BACKGROUND Routine mgintenance is the most economical method for safeguarding the public investment in bitumin{us paved streets. The bituminous street surface weakens as a result of sunlight exposure, ~recipitation, freeze/thaw cycles and traffic loading. As a result, the asphaltic componen~ of the bituminous becomes brittle and susceptible to cracking. Once water is able to pen[:trate surface cracks into thc road base, pavement deteriorates at an accelerating pace. To ~¥oid this rapid deterioration, it is thc acknowledged goal of the City to address the mainte~iance needs of its street system on a periodic basis. ! Table 1 btlow provides the history of the pavements proposed for the 1994 Street Maintenar~ce Program. The 1994 program consists of fourteen individual public improvement projects which have been defined on the basis of individual subdivisions. Projects 94-01 through 94-11 consist of scalcoating operations which will be preceded by spot repair.~f isolated failed areas. Also, these projects will have the large working cracks which axe t~etween 1/4 inch and one inch wide filled with a rubberized asphalt mater/al prior to sealcoa~ng. Projects 94-I2 through 94-14 consist of placing a one and one-half inch bituminoug overlay on top of the existing pavement. The overlaying process, while more expensive l~han the sealcoating operation, adds additional pavement strength and presents a smooth and[ like new surface. The streetslscheduled for maintenance are illustrated in Exhibit A. All streets proposed for the 1994 ~ogram have received a preliminary survey by the City Engineer and Public Works Sup~ervisor. A post winter survey will be conducted prior to awarding bids in June. Appropria~ project adjustments will be made if portions of Projects 94-01 through 94-11 are deemex~ to be inappropriate for sealcoating due to advanced deterioration or insufficient pavement structure. PROJECT QUANTrrIES AND COSTS Table 2 prCvides a detailed breakdown of street lengths, widths and pavement areas for each project. Individual projects have been delineated such that the majority of the properties .~enefitted within each project have similar characteristics. Estimates are also provided f~ crack filling material application rates and City Public Works Department time necessary [o provide the patching and preparatory work prior to the crack filling and sealcoarin~work. Both the sealcoating and crack filling operation will be applied by a contractor ~_elected through the competitive bidding process. Previous years low bid and estimated 1'~994 unit prices for sealcoating and crack filling are as foltows: Sealcoating Crack Filling 199~1 Actual .292 0.92 199~2 Actual .350 0.833 199~3 Actual .348 0.70 199~ .370 0.83 Estimated