ON SEPTEMBER 21, 1989, THE AGENCY SIGNED AN ADMINISTRATIVE ORDER ON CONSENT WITH THE PENNWALT CORPORATION FOR A STUDY REGARDING A CORRECTIVE ACTION AT PENNWALT'S WYANDOTTE, MICHIGAN SITE. THE SITE IS DIVIDED INTO THREE DISTINCT AREAS: THE EAST PLANT; THE WEST PLANT; AND THE WEST BRINE FIELD AREA. PURSUANT TO THE AOC, PENNWALT AGREED TO CONDUCT A RCRA FACILITY INVESTIGATION, AND IF NECESSARY (UPON REVIEW OF U.S. EPA), A CORRECTIVE MEASURES STUDY TO IDENTIFY AND EVALUATE ALTERNATIVES FOR CORRECTIVE MEASURES. IN JANUARY OF 1991, THE RFI WAS STILL CONTINUING AT THE SITE. A NEW RCRA TECHNICAL PERSON, MIKE VALENTINO WAS ASSIGNED TO THIS SITE IN MID-1991. IN JUNE 1993, THE AGENCY RECENTLY APPROVED PENNWALT'S EAST PLANT RFI WORK PLAN AND QAPP. IT IS ANTICIPATED THAT INVESTIGATORY FIELD WORK WILL BEGIN ON THE EAST PLANT IN JULY 1993. THE AGENCY IS CURRENTLY REVIEWING RFI WORK PLANS FOR THE WEST PLANT AND WEST BRINE FIELD AREA.