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approximately$30 million over the 10-year period. The reduction in the backlog resulting from this level <br />of annual investment in preservation is represented by the red area in Figure 2. <br />Public Works reviewed the $53 million backlog and other available data and produced a map showing <br />preservation projects that would be necessary to accomplish an outcome similar to that shown below. <br />Estimated reduction in capital preservation backlog resulting from $8.5 million <br />Figure 2: <br />annual investment in capital preservation activity. <br />The most cost-effective approach is to use a ?best-to-worst? treatment priority. This allows the City to <br />apply preventive maintenance primarily in the form of overlays in the early years of the program to keep <br />marginal pavements from slipping into the more expensive reconstruction category. In the latter years of <br />the program, the work effort would be directed more toward reconstruction projects. Appendix E <br />contains maps showing locations of projects over several phases of a 10-year preservation program. <br />INTERGOVERNMENTAL PARTNERSHIP EFFORTS <br />Intergovernmental relationships play a significant role in the operation, maintenance, and preservation of <br />Eugene?s transportation system.Examples of intergovernmentalrelationships include inter-jurisdictional <br />partnerships designed to provide operating efficiencies, formal financial agreements, and shared interests <br />in finding regional solutions to common problems. <br />Lane County Partnerships <br />Eugene works closely with Lane County in several areas related to transportation operation, maintenance <br />10 <br />