Probably just the outflow from the Men's Room....just a thought!
Really happy and amazed to hear the investigation was thorough and a fine was the result. Combined sewer and storm lines are a challenge in a lot of other countries, especially ones with old and ageing infrastructure, including mine. The city where I live has been renewing old lines and separating them. All in preparation for a new sewerage treatment they have to build to comply with new federal regulations.*
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