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Table 10-1 <br /> Atmospheric Hazard Guidelines <br /> Monitoring Ambient <br /> Ecruinment Hazard Level Action <br /> Combustible Gas Explosive <10% LEL Continue investigation <br /> Indicator atmosphere with precautions. <br /> 10%-25% Continue on-site <br /> monitoring with extreme <br /> caution as higher <br /> levels are encountered. <br /> >25% LEL Explosion hazard; <br /> withdraw from area <br /> immediately. <br /> Oxygen Oxygen <19.5% Monitor wearing SCBA. <br /> Concentration NOTE: Combustible gas <br /> Meter readings are not valid <br /> in atmospheres with <br /> <19.5% oxygen. <br /> 19.5%-25% Continue investigation <br /> with caution. SCBA not <br /> needed, based on oxygen <br /> content only. <br /> >25.0% Discontinue inspection; <br /> fire hazard potential. <br /> Consult specialist. <br /> Radiation Survey Ionizing <1 mR/hr Continue investigation. <br /> Meter Radiation If radiation is <br /> detected. above back- <br /> ground levels, this <br /> signifies the presence <br /> of possible radiation <br /> sources; at this level, <br /> more thorough mon- <br /> itoring is advisable. <br /> Consult with a health <br /> physicist. <br />