Re: Proposed amendments to dissolved oxygen standard (R04-25)
Dorothy Gunn, Clerk R E C E ~V E DIllinois Pollution Control Board CLERK’S OFFICEJames R.
Thompson Center
100 W.
Randolph St.
The current Illinois standard for dissolved oxygen follows U.S.
Environmental Protection
Agency guidelines and past scientific studies do not support a .lower standard.
Low dissolved
oxygen levels in the Fox River will also negatively impact fish species that spawn in late summer, andsportfish such as smalimouth bass are sensitive to low dissolved oxygen levels. As these stressors become intens...
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