Sunbury engineer: wastewater plant expansion advancing with new aerobic digesters
November 06, 2025 | Sunbury City, Delaware County, Ohio
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Engineer remarks and shared drone photos showed the new digesters’ walls rising above grade. The engineer described the concrete walls as thick, reinforced with rebar, and noted continued concrete pours and stone backfill (a clean washed angular stone placed around new structures). She said the digester walls will stand roughly 4 feet above the surface and indicated the contractor is finishing wall pours and ancillary work. Staff invited council members to observe select morning pours, with necessary safety equipment and limited viewing windows.
The engineer said the project will increase plant capacity; meeting dialogue included numeric references to doubled capacity, though staff indicated precise capacity figures and final commissioning timelines remain subject to final testing and contractor reports. The engineer also noted the Columbus Street parking-lot project and that lighting at the lot will likely not be installed until spring, leaving the lot dark over winter despite being substantially complete for parking by Thanksgiving.
Council had questions about structural backfill; the engineer explained use of a clean, angular wash stone (3/4-inch type referenced) for perimeter bedding and that, from a structural standpoint, the walls are robust enough to accept backfill as planned. Staff emphasized public-safety considerations for site visits and said they will notify council about opportunities to observe work.
The engineer’s presentation provided the primary project update; council will receive future progress reports and construction photos as the plant moves toward mechanical completion and testing.
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