Wellington staff seeks $2.78 million GMP for Membrane Plant 2 expansion to add nanofiltration
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Summary
Staff recommended a guaranteed maximum price contract to expand Membrane Plant 2 capacity and add nanofiltration to remove PFAS and other contaminants; the project is part of a phased program that will replace the village’s lime plant.
Village staff recommended approval of a guaranteed maximum price (GMP) amendment and associated construction-phase services for the Membrane Plant 2 expansion, a multi-year effort to increase membrane treatment capacity and reduce reliance on the lime plant.
Miss Pance told council members that Membrane Plant 2 currently consists of three membrane trains and that the project will increase each train’s vertical capacity within the existing footprint, raising each train’s output to roughly 2.4 million gallons per day. The work is intended to add incremental capacity equivalent to another 1.8 million gallons per day and ties into the membrane master plan to phase out the existing lime plant.
Pance described the added treatment as nano filtration, which she called ``industry best available technology'' for removing per- and polyfluoroalkyl substances (PFAS), disinfection byproducts and other contaminants of emerging concern. Staff said the GMP under the village’s contract with Wharton Smith is $2,775,015, which includes $150,000 in owner-controlled contingency. The item also included a $154,845 construction-phase services proposal from Kimberly Horne & Associates.
Council members pressed on timing and asset life spans. Staff said they hope to be close to removing the lime treatment plant from service by about 2028–2029, with two remaining projects to complete in design and construction phases. Pance said membrane elements typically require replacement every 7 to 10 years, pumps about 20 years and piping/infrastructure can last several decades.
Ending
If the council approves the GMP and task order at the formal meeting, the work would proceed as part of the village’s membrane master plan and the utility’s long-term plan to replace lime treatment with membrane capacity.