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Engineer outlines $14.6 million wastewater upgrade to meet ammonia, phosphorus limits
Summary
A draft impact-fee facilities plan proposes a LEMNA polishing reactor and related upgrades to meet new permit ammonia and phosphorus limits, with a $14.6 million estimate and roughly $7 million allocated to existing users and $7 million to future growth; the board received the draft and will review the report and supporting impact-fee analysis.
Engineer Brendan Thorpe (presented to the board as "Brandon" during the meeting) gave a lengthy overview of a draft wastewater impact-fee facilities plan and proposed wholesale-treatment agreements. Thorpe explained the next permit cycle requires phosphorus and ammonia removal, and presented a LEMNA polishing reactor (LEMNA polishing reactor) as the recommended approach because it offers cost and reliability advantages over options such as a mechanical activated‑sludge plant, wetlands or expanded lagoons. "This right here is a LEMNA polishing reactor ... it's basically a concrete basin that has large cube media modules," Thorpe said.
Thorpe summarized the draft cost estimate at about $14,600,000 and said proportional allocations in the current draft put roughly $7,000,000 on existing users (largely for ammonia and phosphorus requirements) and about $7,000,000 for future-growth capacity. He described alternative build scenarios and conversion factors (ERUs) and said the recommended base upgrade would raise treatment capacity to 2.7 million gallons per day, with design options sized to expand to 3.5 million gallons per day in the future. The board accepted the draft for review and was told the next step is a public‑finance impact‑fee analysis and negotiations on wholesale agreements with potential wholesale customers.
