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1 <br /> INC <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 /> Flammable Gases and Vapors <br /> Background Level D PPE <br /> BG-20% LEL Level D PPE if methane, <br /> ' evacuate if organic vapors also read > 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 /> 1 <br /> t Radiation <br /> Background Continue work <br /> Two times background Stop work Call Environmental Health <br /> ' Department Monitor area thoroughly Call <br /> HSO <br /> APPENDIX I <br /> 2270020 025 13 <br />