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18. Action levels <br /> —+ A. Protection Levels <br /> 1. Unknown contaminants <br /> For totally unknown contaminants,the following levels of protection should be utilized: <br /> Breath Zone HUN/OVA <br /> Q for 1 rnlnutw <br /> Background Level D <br /> 0-5 ppm above background Level C <br /> 5-500 ppm above background Level 8 <br /> 500-1000 ppm above background Level A <br /> 2. Known Contaminants <br /> Action Level <br /> Above <br /> Instrument& Background <br /> Date Of Calibration Span/Setting tBreathing <br /> Calibration Standard Gas Select ono) Action <br /> .i <br /> PID ppm Benzene 5 ppm for Don respirator <br /> .: greaterthan (Level 0) <br /> 1 minute <br /> B. Explosion Hazard <br /> Action Level <br /> Instrument& Above Background <br /> Date of Calibration (Ambient Air) Action <br /> Gas Tech More than 20%LEL Do Not Enter or Leave Area <br />