BAYER FAILED TO MONITOR THE VALVES IN TWO OF ITS PROCESS UNITS ON THE REQUIRED FREQUENCY AND ON TWO OCCASIONS FAILED TO RE-MONITOR A LEAKING VALVE WITHIN FIVE DAYS OF DETECTION IN VIOLATION OF THE NATIONAL EMISSION STANDARD FOR HAZARDOUS AIR POLLUTANTS APPLICABLE TO ITS PESTICIDE ACTIVE INGREDIENT MANUFACTURING FACILITY LOCATED IN INSTITUTE, WV.