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AIR MONITORING <br /> Air monitoring should be conducted with instruments selected to measure contaminants that employees may be <br /> exposed to. Measurements should be taken within the breathing zones of workers. If action levels are reached <br /> for one minute reading, appropriate action must occur. <br /> GASES AND VAPORS <br /> Instrument Calibration Frequency/Duration Action Level <br /> Date of Gas of Air (a) (b) Above Ground <br /> Calibration Standard Monitoring Breathing Zone Action <br /> Introduce <br /> controls (fans) <br /> Gear level_ <br /> Don respirator <br /> Gear Level C <br /> Upgrade to Level B <br /> Upgrade to Level A <br /> (a) Action Levels for "known contaminants" should be based upon the contaminants Permissible Exposure <br /> Level (PEL) or Threshold Limit Values(TLVs). <br /> (b) Action levels for unknown contaminants are based upon the following: <br /> HNu or OVA Measurements in Breathing Zone-one minute reading <br /> Background Level D <br /> > 9-5 ppm aboveground background Level C <br /> 5-500 ppm aboveground background Level B <br /> 500-1,000 ppm aboveground background Level A <br /> Comments: <br /> EXPOSURE HAZARD <br /> Instrument Frequency/Duration Action Level <br /> Date of of Air (a) (b) Above Ground <br /> Calibration Monitoring Breathing Zone Action <br /> Greater than 20% LEL Leave Area <br /> OXYGEN DEFICIENCY <br /> Instrument Frequency/Duration Action Level <br /> Date of of Air (a) (b)Above Ground <br /> Calibration Monitoring Breathing Zone Action <br /> Less than 19.5%02 Do not enter <br /> More than 23%02 <br /> 11 <br />