THE MWRA BYPASSED FLOW AROUND SECONDARY TREATMENT AT DEER ISLAND ON AT LEAST 499 OCCASIONS WHEN THERE WAS A FEASIBLE ALTERNATIVE TO SUCH BYPASSES IN VIOLATION OF THE PROHIBITION ON BYPASS INCLUDED IN THE MWRA'S NPDES PERMIT. IN ADDITION TO ITS BYPASS VIOLATIONS, THE MWRA HAS FAILED TO MONITOR THE DEER ISLAND EFFLUENT IN ACCORDANCE WITH ITS NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM ( NPDES ) PERMIT, PERMIT NUMBER MA0103284( THE PERMIT ). THE PERMIT REQUIRES THE MWRA TO COLLECT DAILY FLOW-PROPORTIONAL SAMPLES, BUT THE MWRA HAS COLLECTED TIME-PROPORTIONED SAMPLES.MONIORING CONDUCTED TO DATE, THEREFORE, MAY NOT ACCURATELY REPRESENT EFFLUENT CHARACTERISTICS.