I am submitting this public comment letter to the Illinois Pollution Control Board as afollow-up to my testimony during the November 2007 hearing regarding proposedchanges to the state’s current dissolved oxygen standard.
Knowing that water’s capacity for oxygen increases with declining temperature, it further
supports the supposition that increased flow plus reduced temperatures (combined withincreased aeration) are predominately involved in dissolved oxygen dynamics in manyIllinois streams.
Thus, occasional drops in dissolved
oxygen in portions of an organism’s extent will not be a problem if the organism hasrefuges down- or up-strea...
Allowed
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