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Oops, you are correct, Philip. My last post to Scott indicated my leaning towards a bio pond. It has also been suggested that such a pond, though, would at least act as a filter if biodegradation did not occur. I hope you don't mind I bcc'd you to avoid the spambots. Thank you for your input. Bob On Fri, 21 Nov 2003, Philip wrote: > I doubt the feasibility of a bio pond. Biodegradation of TCE involves > cometabolism under aerobic conditions and u need a large source of electron > donars to power the microorganisms. The stream, presumably clean is devoid > of organic substrates. > > Best way to go is still air stripping thro' some kind of artificial > waterfalls or series of steps. u can even argue for natural attenuation.... > the cheapest of all options. > > philip
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