From this article in the Columbus Dispatch:
"With a pH level of 4.5 when the cleanup started two decades ago, 'Monday Creek was comparable to vinegar,' Schlater said.
Aquatic wildlife has increased since then, from four fish species to 35 species today, including seven types of darters, and large-mouth, small-mouth and spotted bass. 'This shows that water quality is improving significantly,' Schlater said."