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Notes:
The results of the food web modeling indicate that even under existing conditions, there may be effects to the reproduction of fish-eating birds and marine mammals due to the combined concentrations of PCB's, Mercury, and DDT. Now when I say that there may be effects even under existing conditions, I should emphasize that there is uncertainty in these results and this uncertainty can be associated with both the exposure or the dose that we estimated, and also with a toxicity or the dose that would be expected to cause effects. And in general for our analysis we did select perameters for our model that tended to predict a high end of risk, so we expected that what we have predicted is basically a reasonable worse case estimate of risk.