Firstly is he telling the truth or is this yet more in the war to reduce Lanxess liabilities? I've written more than enough here for readers to know what I think about the company's credibility. Right now they are pushing hard between their Mickey Mouse Creek Risk Assessment and their alleged "asymptotic behaviour" of the contaminant plumes in the Elmira Aquifers. It's all about reducing the company's liabilities while dragging reluctant affirmation from all their fellow travellors.
At this late date does the addition of hundreds of kilograms of free phase DNAPL (chlorobenzene) genuinely have them worried? After all contaminant "rebound" can occur through back diffusion but far worse would be free phase DNAPL slowly dissolving above drinking water standards for the next 100 years or more. And no, dissolution of chlorobenzene from free phase into the groundwater is not an "asymptotic behaviour" because it will eventually reach a concentration of zero after all the free phase has dissolved be it in 100 or two hundred years or so.
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