After completing an initial sewer assessment and developing a preliminary budget, a government agency chose a design-build delivery approach to complete the required sewer manhole and pipeline rehabilitation. By selecting a design-builder, the government ensured that a single team could conduct the sewer/manhole inspection, determine the necessary repairs, perform the required engineering and cost estimating for the proposed rehabilitation, and complete the construction work. The design-build approach increased the likelihood of meeting the government's desired schedule -completion in less than one year - while achieving the goal of assessing and then rehabilitating approximately 10,000 linear feet of piping and more than 50 manholes. The design-build delivery method had several advantages over a traditional design-bid-build delivery method. Uniting the contractor and engineer on a single team enables the engineer to review the sewer inspection videos and develop the scope of work at the same time that the contractor evaluates the method of repair. Simultaneous completion of these tasks reduces the time needed for engineering adjustment. Details for open excavation point repairs were developed during construction and were based on actual site conditions. The design-build approach also maximizes coordination between the engineer and contractor during the engineering process. While the contractor addresses constructability issues in the design, the engineer ensures that the original design intent is maintained through any changes. For this project, a design-build approach gave the government and design-build team flexibility to adapt the project to the existing site conditions within the original project budget.
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