Low Nitrogen Pressure Report for CO-OPS NWLON, Great Lakes, and Hydro List Stations The following stations reported less than 500 PSI nitrogen cylinder pressure (L1, M1) during the past 24 hours (preceeding full day - GMT). Last updated: 11 07 2009 For the day: 11 06 2009 Please contact the Field Operations Division - Pacific Regional Office at (206)526-6360 to report problems or request changes to this list. Please contact FOD-PRO if L1 or M1 sensors noted in the report are not Nitrogen cylinder pressure sensors.