The Illinois Senate sent a bill (S.B. 664) to the governor November 22 requiring oil exploration companies engaged in hydraulic fracturing to make disclosures to the Illinois Department of Natural Resources. Under the legislation, companies would be required to report the geological names, a geological description, the depth of the formation into which well stimulation fluids are injected, each stimulation fluid identified by additive type, and the chemical compound and Chemical Abstracts Service number for each additive used in the process.