Citywide Residential and Local Streets Improvements Project

The City maintained & rehabilitated approx. 55 citywide residential & local streets totaling approx. 1.7 million square feet of an area costing approx. $2.2M. This project involved extensive public outreach & coordination with the residents to ensure the roadways remained open & had the least impact to the community. The project utilized Rubberized Asphalt Concrete (RAC) to provide a sustainable cost-effective roadway which can be used at reduced thickness compared to conventional asphalt overlays. RAC is a blend of paving grade asphalt cement, ground recycled tire rubber & other additives for use as binder in pavement construction. CA produces more than 40 million waste tires annually, of which approximately 75 percent are diverted from landfill disposal. For this project approximately 20,000 waste tires were used in rubberized asphalt. The City took advantage of the work being done & included other improvements at various locations in the City, including parking lot improvements, traffic calming measures, & beautification components. This minimized additional inconveniences if this work were to be performed at a later time as a stand alone project. This value engineered method saved time & budget throughout the project as well as minimized street closures compared to full removal & reconstruction method. This project provided durable, safe, & quiet pavement to local streets, which resists cracking & lasts approx. 50% longer than conventional materials. It also provides skid resistance, which provides better traction. The RAC method retains darker color longer so the road markings are more clearly visible for safety. Street maintenance & preservation work also consisted of constructing slurry seal to citywide residential streets with total area of approx. 775,000 square feet. This preventative maintenance method prolonged the life of the pavement at a lower cost compared to higher cost of pavement repair & reconstruction. Maintenance work also included refreshing all crosswalks & striping throughout the City including streets adjacent to school zones enhancing pedestrian safety. In areas where subbase was soft due to excessive moisture, removing the subbase & reconstructing the street was not a reasonable engineering approach, as it would be extremely expensive, as well as it would leave the street open for a long duration during construction. The value engineered solution was to only remove & replace localized areas where necessary, & cold mill & overlay other pavement areas. In localized removal & replacement areas, clayey subbase was removed about 18”, & geo-textile fabric was installed to above remaining subbase, then 6” crushed aggregate base, then added another geotextile-fabric layer, & then another 6” crushed aggregate base, then 2” conventional AC, then final 2” rubberized AC. This value engineered method mitigated existing subsoil conditions with excessive moisture & constructed structural sections in local repair areas