Salmo......I would just like to know if there have been obvious results of the "600 gallons/day" statement...like dead fish, birds, bears, fishermen, etc., that can verify a need to further regulate.

I wouldn't discount a water test, if I knew the details, like where, when, frequency of tests and the depth of samples and flow conditions, etc. Since fuel tends to float then evaporate, I have my doubts that fish are much affected by outboard exhaust. I would think that the fisherman would be more apt to suffer the effects of second-hand smoke than the fish. Am I wrong?