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0 • <br />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. OASES AND VAPORS <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 />L:150000\50441\WP150441k27.doc 13 <br />Action Level <br />Instrument & <br />Frequency/ <br />(a)(b) Above <br />Background <br />Date of <br />Calibration <br />Duration of Air <br />(BreathingZone) <br />Calibration <br />Gas Standard <br />Monitoring <br />fiction <br />HNU - daily <br />100 ppm <br />periodically <br />greater than <br />Introduce <br />isobutylene <br />during <br />background <br />engineering controls <br />excavation <br />(i.e., blower fans <br />and sampling <br />(Level D) <br />>5 ppm <br />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 />L:150000\50441\WP150441k27.doc 13 <br />