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City staff express concern over new chloride compliance schedule for wastewater permit
Summary
Staff said the wastewater plant recently completed a costly UV upgrade but faces a new permit requirement that adds a chloride compliance schedule; they expressed concern about meeting the lower limits and noted prior routine chloride results in the mid-300s to low-400s.
At the start of the meeting, a staff speaker described recent operational and permit changes at the wastewater plant. The speaker said the city had just finished an approximately $800,000 installation of a UV system but the plant’s new permit includes a chloride compliance schedule that could be difficult to meet.
The speaker said the plant’s typical chloride readings historically ran around 340–360 milligrams per liter, with occasional short-term spikes into the 400 range; the meeting text noted recent readings described as “420–440” and a separate remark referenced a value of 630 (context unclear). The speaker asked how the plant would consistently meet a stricter compliance limit, given the recent changes and the capital expense already incurred.
Council and staff did not resolve the compliance question in the meeting; staff indicated ongoing monitoring and a plan to address maintenance and treatment issues. Council did not vote on permit changes at the meeting, and staff said they would continue work with regulators and report back with any formal compliance schedule or budget implications.
