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X. AIR MONITORING <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 /> If action levels are reached for a 1-minute reading, appropriate action must occur. <br /> A. GASES AND VAPORS <br /> Action Level <br /> Instrument& Frequency/ Back Above <br /> Background <br /> Date of Calibration Duration of <br /> Calibration Gas Standard Air Monitoring (Breathing <br /> BZont e)) <br /> eAction <br /> HNU-daily 100 ppm periodically greater than Introduce <br /> isobutylen during background engineering controls <br /> excavation (i.e.,blower fans <br /> and sampling (Level D) <br /> >5 ppm Don respirator <br /> (Level C) <br /> Leave area (Level Q <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 I 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 /> G:\WP\GDH\GH41017G.356 14 <br />