OARS Columbus, Ohio The OARS (OSIS Augmentation and Relief Sewer tunnel project is designed to collect and consolidate combined overflows from the OSIS and convey the combined flows to the Jackson Pike and/or Southerly wastewater treatment plants for biological treatment. Developed to provide adequate capacity for all storms in a typical year. The project is to be built in two phases. Phase 1 comprises three large diameter shafts (Shaft

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