This Mar. 25, 2002 article  from the Courier-Journal covers some of the things that went into the $22.1 Million study of the environmental impact of the proposed Ohio River bridges. The study and its technical reports stand over eight feet tall. Among the things that went into the report are studies of bats conducted by gluing radio transmitters onto them, dredging the Ohio River to look for mussels, cataloging and analyzing historic properties, and recording noise levels a 178 points. Of course for all of the detail that went into the report, anti-bridge groups claim that it fails to accurately represent the environment of the area.