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City hears update on wastewater treatment solids upgrade; GMP expected this fall
Summary
City utilities staff and contractor teams updated the commission on a solids upgrade and expansion at the wastewater treatment plant, reporting a 90% design, a preliminary $25 million cost benchmark from the 60% model and a plan to submit a guaranteed maximum price this fall; construction is projected to begin October 2025 and take 18–24 months.
Manhattan City Commissioners heard an update on the wastewater treatment plant solids upgrade and expansion project from Public Utilities staff and the CMAR (construction manager at-risk) team, who said they will submit a guaranteed maximum price (GMP) to the city this fall.
The project team — Kevin Niles, director of public utilities; Garrett Sheehan of Corolla Engineering; and Joe Barnes of Crossland/Crossland Heavy — described an upgrade that touches every part of the plant’s solids process. The plant’s liquid stream capacity was boosted to 11 million gallons per day (MGD) in 2013; project presenters said the solids-processing equipment has not seen major improvements since 2004 and now requires replacement, modernization and automation to improve digestion, thickening and regulatory adaptability.
The upgrade is intended to enhance process performance, redundancy, resiliency and reliability; optimize operations; and preserve the city’s autonomy over biosolids management. Plant staff noted that processed biosolids are stored in sludge lagoons and applied to city-managed farmland; presenters said the project…
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