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Certain
adjustments for fish consumption or for ADI/RfD used were perhaps already
made for several tolerance limits or MRLs listed in
Tables 1A,
1B, and
1C. This may
explain partially why the tolerance values used in some regions are so
different from those used in others. In addition to the various types of
residue tolerance limits discussed earlier, U.S. EPA (1995) developed a set
of screening values as threshold levels for the more prominent POCs,
with the intent to provoke more intensive specific-site residue monitoring.
Using a more updated consumption rate
for subsistence fishers along with newer toxicity data, U.S. EPA
(2000a) later updated these values.
This type of screening values can also be used
to provide a rough human risk analysis. Such use was demonstrated and
discussed extensively in
Part II.
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