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inorganic Gases (H2S, HCN <br /> Background to 5 ppm breathing zone Level D PPE <br /> 5-40 ppm breathing zone Level B PPE <br /> X40 ppm breathing zone Level A PPE or evacuate <br /> Flammable Gases and Vapors <br /> I <br /> Background Level D PPE <br /> BG-20% LEL Level D PPE if methane; <br /> evacuate if organic vapors also read > <br /> 1000 ppm <br /> X20% LEL Ventilate below 20% LEL; stop work if <br /> unsuccessful <br /> Oxygen <br /> 19.5%-21% Level D or Level C P P E <br /> <19.5% Level B PPE <br /> Radiation <br /> Background Continue work <br /> Two times background St p work. Call Environmental Health <br /> Department. Monitor area thoroughly. <br /> Call HSO. <br /> 13 <br />