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J <br /> Table 1 <br /> Hazard Exposure Guideline � <br /> Substances Cal OSHA 1988-89 ACGIH <br /> PEL TLV <br /> Benzene 10 ppm (TWA) 10 ppm (TWA) <br /> 25 PPm (EXC) 25 PPm (STEL) <br /> 50 ppm (Ceiling) <br /> Toluene 100 ppm (TWA) 100 ppm (TWA) <br /> 300 Ppm (Ceiling) 150 PPm (STEL) <br /> Xylene 100 ppm (TWA) 100 ppm (TWA) <br /> 150 PPm (STEL) <br /> Gasoline 300 ppm O WA) 300 ppm (TWA) <br /> 500 ppm (STEL) <br /> Possible contaminants that could be encountered as <br /> presently known. <br /> ACX- <br /> G <br /> 5 <br />