Agenda - Public Works Committee - 05/17/2016

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Public Works Committee 5.3. Meeting Date: 05/17/2016 By: Bruce Westby,Engineering/Public Works Title: Provide City Council Recommendation for 2016 Crackscal and Scalcoat Improvements, Improvement Project 416-00 Division A Purpose/Background: Purpose: The purpose of this case is to review Staff s proposed plans for Division A of the 2016 Street Maintenance Program,crackscaling and scalcoating improvements, as well as a summary of funds allocated to crackscaling and scalcoating improvements since 2012,and to provide a recommendation to City Council related to approving the proposed improvement plans for 2016. Background: As part of the city's long-term Street Maintenance Program,various city streets receive crackscaling and scalcoating improvements each year to help maximize the life expectancy of street pavement sections. Crackscaling streets helps prevent stormwater runoff from seeping through cracks in the pavement and through joints between the pavement and concrete curb and gutter and/or utility castings,thereby reducing future pavement damage due to wet pavement subgrades. Scalcoating streets helps protect the pavement from the negative effects of stormwater runoff, the sun's rays, and oil based by-products deposited on the surface of the pavement by vehicles using the street. City staff has therefore prepared plans for Division A of the 2016 Street Maintenance Project which involves crackscaling and scalcoating approximately 13.53 miles of municipal streets in various locations throughout the City. Attached is Exhibit A showing the locations of all streets throughout the city to be crack scaled and scalcoated in 2016. Also attached is a cost estimate for the proposed improvements, including cost breakouts for each street segment. Per page 1 of the cost estimate, Staff is proposing to fog seal two areas;Ramsey Meadows 2nd Addition and the Fire Station 1 parking lot. Fog scaling was completed on several streets last year on a trial basis to determine if the benefits outweighed the costs. Other cities have been fog scaling over Scalcoat applications in recent years and reportedly observed benefits including that the pavement looks newer for longer,plus the fogsealing locks the Scalcoat rocks in better preventing the rock from making its way into garages,homes and businesses on tires and the bottoms of shoes.However,based on field observations this spring, staff found roughly the same amount of loose rock on streets that were fog scaled versus streets that were not. Staff therefore does not believe the application of fog seal in conjunction with scalcoating provides enough benefit to outweigh the additional cost for most streets. That said, staff is proposing to fog seal Ramsey Meadows 2id Addition due to the newer condition of the abutting streets. Fogsealing will help blend this year's scalcoating in to those streets due to the darker surface it provides. Fog scaling is also anticipated to benefit Fire Station 1 by reducing the amount of loose rock being tracked into the bays. No Traprock is being proposed with this year's project. Staff plans to request City Council approval of plans and specifications and authorization to advertise for bids for Division A of the 2016 Street Maintenance Program on May 24h. Also attached to this case is a summary of funding allocations spent on scalcoating projects since 2012,which will be discussed with the Committee in more detail.