05/29/19 City Council Agenda Packet - Work Session

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Project Prioritization Methodology Selecting streets or street sectionsfor treatment is done through a process involving analysis, testing, and staff experience. Using the data produced by Paver, and combining this information with estimated revenues allows staff to approximate backlogs and group potential street sections for consideration for treatment under the Pavement Preservation Program. As a means of optimizing funding, stbasis. Rather, Public Worksmain objective is to keep street sections from slipping into reconstruct, a more costly category, see . By overlaying a street before it significantly deteriorates, 15to 20 years of useful life can be added, resulting in substantial cost savings. Once a street has deteriorated to the point that it must be reconstructed,the opportunity for an overlay is lost.As a result, streets that are categorized as overlay projects receive the highest priority for corrective treatment.Street Bond Measures have been the exception, additional criteria such as citizen input and equitable geographic distribution of projects throughout the community are also considered. Sustainable Construction Since 2008, Eugene has been inthe forefront of sustainable construction and paving practices, some of which include paving with warm mix asphalt (WMA), using reclaimed asphalt pavement (RAP),and full depth reclamation (FDR). Production of warm mix asphalt solution for the environment with noticeably reduced energy consumption and greenhouse gas emissions. Exposure to fuel emissions, fumes, and odors are reduced for asphalt producers, construction workers,and the public. Benefits of paving with WMA are the ability to extend the paving season in colder weather,longer haul distances, and better road performance. Warm mix asphalt is identical to conventional hot mix asphalt, except that through a special mixing process itis produced at a temperature approximately 50 to 100 degrees cooler than conventional hot mix asphalt. This mixing process for asphalthas many benefits, it aids in compaction during paving, helps prevent premature aging, andslowsthe aging process of asphalt. In Eugene, all asphalt producers have retrofitted their plants to produce warm mix asphalt. Council set goals in 2011 for waste reduction byrequiring that the volume of material placed in landfills be reduced. In addition to using WMA, Public Works conducted twopilot projects specifying that reclaimed asphalt shingles (RAS) be used as a binder in the asphalt mix, thereby keeping this material from entering the waste stream. The City continues to use warm mix asphalt and in-place recycling techniques to improve the quality, environmental footprint, and cost efficiency of the street bond projects. Key terms in sustainable construction practices: In-Place Recycling: A process in which a large piece of equipment called a reclaimer pulverizes and mixes the existing base rock and a portion of subgrade soils with dry cement and water to create a cement-treated base. This process greatly reduces the use of virgin materials and trucking that are needed using conventional remove-and-replace construction techniques. 12 May 29, 2019, Work Session - Item B