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■VZ1 INC <br /> Total Organic Vapors <br /> 0 ppm or "background" (BG) Level D PPE <br /> Above BG to 5 ppm breathing zone Level C PPE <br /> 5-500 ppm breathing zone Level B PPE <br /> 500-1000 ppm breathing zone Level A PPE <br /> >1000 ppm breathing zone Evacuate <br /> Inorganic Gases (1-12S, 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 <br /> PPM <br /> >20% LEL Ventilate below 20% LEL, stop work if <br /> unsuccessful <br /> . 08220010 011 APPENDIX I <br /> 13 <br />