On August 29, 1997, EPA entered into an Administrative Order by Consent for Remedial Investigation/Feasibility Study (No. 97-105-DC), pursuant to Sections 104 and 122 of CERCLA, with seven potentially responsible parties (AlliedSignal, Inc., FMC Corp., Novartis Corp., Olin Corp., Shell Oil Co., Union Carbide Corp., and Wilimngton Securities, Inc. The RI/FS Work Plan was approved in February, 2003, and field work began the following March.