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VZ1 INC. <br /> Inorganic Gases (HAS. HCN) <br /> Background to 5 p.m. breathing zone L evel "D" P.E. <br /> 540 p.m. breathing zone Level "B" P.E. <br /> >40 p.m. breathing zone I evel "A" P.E. or evacuate <br /> Flammable Gases and Vapors <br /> Background I evel"D"P.E. <br /> BG-20% LEL Revel "D"P.E. if methane; <br /> evacuate if organic vapors also read> 1,000 <br /> p.m. <br /> >20% LEL Ventilate below 20% LEL; stop work if <br /> successful <br /> Oxygen <br /> 19.5%-21°/fl I.evel "D" or Level "C" P.E. <br /> <19.5% I.evel "B" P.E. <br /> Radiation <br /> Background C ontinue work <br /> Two times background top work. Call Environmental Health <br /> Department. Monitor area thoroughly. Call <br /> SO. <br /> 08420010.001 APPENDIX III <br /> 14 <br />