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V <br /> X. AIR MONITORING <br /> F <br /> Air monitoring should be conducted with instruments selected to measure contaminants that <br /> employees may be exposed to. Measurements should be taken within the breathing zones of workers. <br /> E <br /> If action levels are reached for a 1-minute reading, appropriate action must occur. <br /> A. GASES AND VAPORS <br /> s <br /> Action Level <br /> Instrument& Frequency/ (a)(b) Above <br /> i <br /> Date of Calibration Duration of Background <br /> (Breathing <br /> Calibration Gas Standard Air Monitoring Zone) Action <br /> HNU- daily 100 ppm periodically greater than Introduce <br /> isobutylen during drilline background engineering controls <br /> and sampling (i.e.,blower fans <br /> (Level D) <br /> >5 ppm Don respirator <br /> (Level C) <br /> Leave area (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 <br /> Permissible Exposure 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 <br /> Reading for 1 minute <br /> Background Level D <br /> >0-5 ppm above background Level C <br /> 5-500 ppm above background Level B <br /> 500-1000 ppm above background Level A <br /> Comments: <br /> J45 72.doc 13 <br />