Hey Grandpa,
We met on a Buckners cleanup several years ago. Although I've been on a couple rhodamine dye studies, I can't add to the fine input provided so far. I'm writing in regards to your 'smell was horrific' comment. Last year I was involved in a project looking at delineating sewage sources and combined sewer overflow. I had some acoustic doppler meters to measure discharge (typical physical flow meters don't work well in sewage for obvious reasons) that had to be installed right before the main lines leading into the plant. Even with acoustics, there was a lot of fouling (due to 'grit' accumulation), and the meters needed frequent maintenance - I spent a lot of time down there. I have never wished for olfactory fatigue so much in my life! I also saw formations that not many other people have seen - or would want to... Glad that project is over. A quick pic to give you an idea, btw, that mud isn't mud...