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Explosion Meter < 10%of LEL Work may continue. Evaluate inhalation potential. <br /> > 10%of LEL Work must stop until LEL is Below 10%. <br /> Oxygen Meter < 19.5%02 Leave area. Contact Project Manager for direction. (re-entry only <br /> permitted with SCBA) <br /> 19.5%to 23.5%02 Work may continue. Investigate causes of changes above/below <br /> 21%. <br /> >23.5%02 Work must stop. Ventilate before returning and retest atmosphere. <br /> 02-rich atmospheres pose explosion hazards. <br /> *Action taken based on breathing zone reading sustained for at least 1 minute. <br /> **Action taken based on instantaneous reading. <br /> Miller Brooks Environmental Inc. 1/30/2008 Page 10 <br />