No, it's not a circus that's come to town.
Ameren (formerly Illinois Power) has started an 18 month project to clean-up contamination from the former coal gasification plant that was located on this site dating all the way back to 1865.
|piece of air quality monitoring equipment on site|
|another piece of air quality monitoring equipment on site|
read more about the project in these 2 articles from the Herald & Review:
(most pictures can be enlarged by clicking on it)