Sanitary Conveyance and Treatment Improvements—Western Regional: Progressive Design-Build Project

Montgomery County (Ohio) Environmental Services (MCES) Department is currently in the process of procuring a design-build firm to lead the design and construction of their largest capital improvement project to date. The Sanitary Conveyance and Treatment Improvement Project will include the replacement of MCES’ existing primary pretreatment facility and pumping station and provide new screening, pumping, and pretreatment at their existing Western Regional Water Reclamation Facility (WRWRF). The transport of wastewater flow from the existing pretreatment site to WRWRF will be conveyed by a new 72-inch gravity sewer that will replace an aging force main. This paper discusses the evaluation of the conveyance options to include: adding redundancy through an additional force main or new gravity sewer; multiple trenchless sewer alignments through urban environments; and how alternative project delivery methods could benefit MCES. The progressive design-build project delivery method was selected for this project and will include approximately 7,300-feet of deep sewer installed by microtunneling. This will be the first progressive design-build microtunnel project in the U.S.