Engineering briefing: McMahon tells Harrison board TMDLs will require enhanced treatment and long-term CIP
McMahon engineer Phil Clayman told the board that state DNR TMDL targets for Garner's Creek and Lake Winnebago require phosphorus reductions beyond what typical wet ponds achieve and suggested enhanced settling systems (chemical treatment) and long-term capital investment shared across jurisdictions; a draft ordinance and CIP were presented.
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Phil Clayman of McMahon told the Village of Harrison board that the municipal stormwater permit and recent TMDL (total maximum daily load) requirements will force stricter phosphorus and sediment reductions than the village currently achieves. “Garner's Creek carries a 69% phosphorus and a 60% sediment [reduction requirement],” he said, adding that Lake Winnebago’s phosphorus target can be as high as 83%.
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