Agenda - Council - 10/26/1993 - Laserfiche WebLink

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patching, while smaller cracks would need to be routed wider to insure adequate bonding. When pavements age to the point where a significant mount of block cracking is occurring, the length of cracks become prohibitive to seal in this manner. While the application of seatcoat will not completely seal these smaller cracks, it will reduce the rate of infiltration of water through them, Discussion: The objective of the street maintenance program is to provide appropriate preventive maintenance to pavements to extend their life and avoid the necessity of emergency repair of pavement failures. There are maintenance alternatives to crack filling and sealcoating. Overlays would be the next most cost-effective level of maintenance. An overlay would provide the following additional benefits over sealcoating and crack filling: · Additional structural strength to the pavement which would cause less deflection for a given load. Completely seal all cracks regardless .of size. However, some agencies still precede an overlay with crack filling of the larger working cracks, since they tend to reflect through the overlay. · Eliminate any depressions or pockets and provide a smoother ride. · Provide an aesthetic "like new" appearance. The major disadvantage of the overlay is its increased cost. For example, if all of the 13 to 14 year old pavements in the 1993 Street Program were overlaid instead of sealed and crack filled, individual home owner assessments could be expected to increase from a range of $88 to $204 to a range of $335 to $620. In addition, the City's share would have risen from $98,000 to $215,000. These costs are based on the attractive unit price the City received for this year's overlay program. Conclusions: As a result of citizen comment and my review of the program, I would recommend the following modifications for next year's program: · Increase the amount of time for sweeping from two weeks to three weeks and specify a specific monetary penalty for failure to meet the deadline. · Consider changing the aggregate chip from pea gravel to a fractured chip having less tendency to roll and be peeled from the surface. · Consider adopting a policy ensta'ing property owners that assessed maintenance activity be made no more frequently than five-year intervals. /ocr Reviewed by: City Engineer CC: 10/26/93 Copies Distributed to: City Administrator Public Works Supervisor I I I I I I I I I I I I I I I I I I !