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Historical and Projected Funding Impacts to Residential Streets <br />100% <br />90% <br />80% <br />70% <br />2017 bond <br />60% <br />measure ends <br />2023 <br />50% <br />40% <br />30% <br />20% <br />10% <br />0% <br />200820092010201120122013201420152016201720182019202020212022202320242025202620272028 <br />No TreatmentOverlayReconstruct <br />Figure 6 Historical and Projected Funding Impacts to Residential Streets <br />To date, the primary treatment for residential streets has been slurry seals, which are included in <br />the no treatment category, 207lane miles (89centerline miles). Slurry seal treatment may <br />increase the life by five to seven years, and increasethe PCI, typically elevating it out of an <br />overlay range Following this time period,these same streets will typically fall into the mid to <br />low end overlay treatment category. <br />Residential (Local) streets make up 75percent of the total street system backlog in 10 years.To <br />date,residential streets have not been adequately funded for preservation. Between the three <br />bond measures, approximately 31 centerline miles have or will receive repairother than a slurry <br />seal treatment, less than 10 percent of the residential street system. The percentage of streets <br />within the overlay treatment range continues to increase along with an increase of reconstruct <br />treatments. Looking back, the percentage of residential streets within the no-treatment range has <br />been dropping and is projected to continue so that by 2028,over 45percent of residential streets <br />will require treatment which is 57 percent of the $191 million dollar backlog cost in ten years. <br />17 <br />May 29, 2019, Work Session - Item B <br /> <br />