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Concord officials hear $30 million plan to fix Hall Street wastewater plant ahead of housing growth
Summary
City engineers told the Concord City Council the Hall Street Wastewater Treatment Plant is near its organic-loading limit and recommended new aeration tanks and equipment at an estimated $30 million, with a roughly five‑year design-to-construction timeline and a two‑year window before the plant's discharge permit expires.
City officials on Monday heard a presentation on needed upgrades to the Hall Street Wastewater Treatment Plant that city staff and consultant Wright-Pierce said will require roughly $30 million and about five years to design and build.
The work is aimed at increasing the plant's ability to remove organic loading and ammonia from wastewater as Concord faces a wave of housing development. "The Hall Street plant takes about 75% of the flow from the city of Concord," Wright-Pierce Senior Project Manager Mike Terrio told the council, and the plant's secondary biological treatment capacity is strained because one of two bio-tower treatment units is offline and the other is operating at significantly reduced effectiveness.
Why it matters: The plant was built in the 1970s and 1980s using bio-tower technology that has since produced persistent odor issues and, in Concord's case, a loss of reliable treatment capacity. Wright-Pierce and…
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