DEXTER OPERATES A FOUNDRY AND DRY CLEANING EQUIPMENT MANUFACTURING FACILITY. THE FOUNDRY GENERATES BAGHOUSE DUST WHICH IS EP TOXIC FOR LEAD. THE FACILITY HAS BEEN TREATING THE BAGHOUSE DUST IN A TANK BY MIXING IT WITH CEMENT, BELIEVING THE RESULTANT TREATED WASTE STREAM TO BE NOT HAZARDOUS. RECENT ANALYSES INDICATED THE TREATED WASTE IS HAZARDOUS.