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ZI MC <br /> • Inorganic Gases_(H2S HCN <br /> Background to 5 ppm breathing zone Level D PPE <br /> 5-40 ppm breathing zone Level B PPE <br /> >40 ppm breathing zone Level A PPE or evacuate <br /> I Flammable Gases and Vapors <br /> Background Level D PPE <br /> BG-20% LEL Level D PPE if methane, <br /> evacuate rf organic vapors also read > <br /> 1000 ppm <br /> . >20% LEL Ventilate below 20% LEL, stop work if <br /> unsuccessful <br /> Oxygen <br /> 195%-21% Level D or Level C PPE <br /> 19 5% Level B PPE <br /> Radiation <br /> Background Continue work <br /> Two times background Stop work Call Environmental Health <br /> Department Monitor area thoroughly <br /> Call HSO <br /> Appendix fl <br /> Page 13 <br />