EPA ISSUED A UAO FOR COMPLETION OF THE R.A. ON 2/5/91 TO FOUR PRPS IN THE CIVIL CASE (06-92-0118): UNIROYAL, MONOCHEM, VULCAN, AND STAUFFER CHEMICAL. THE PRPS AGREED TO ABIDE BY THE UAO BY LETTER DATED 4/9/91. A WORKPLAN FOR THE SITE WAS ISSUED AND APPROVED BY EPA IN OCTOBER, 1991.