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,w v <br /> IT <br /> VA <br /> Table 1 <br /> Hazard Expos ire Guideline <br /> Substances Cal OSE;A 1988-89 ACGIH <br /> PEL TLV <br /> ------------------------------------------------------------------------ <br /> Benzene 10 ppm (TWA) 10 ppm (TWA) <br /> 25p Pm {E]tC) 25 ppm (STEL) <br /> 50 ppm (Ceding) <br /> Toluene <br /> E � 100 ppm (TWA) 100 ppm (TWA) <br /> 300 ppm (Ceiling) 150 ppm (STEL) <br />} Xylene 100 PPM (TWA) 100 ppm (700 <br /> r" 150 ppm (STEL) <br /> Gasoline 300 ppm (TWA) 300 ppm (TWA) <br /> 500 ppm (STEL) <br /> 7 Possible contaminants that could be encountered as <br /> presently known. <br /> r <br /> r <br /> x <br /> 1 � <br /> o- <. <br /> 5 , <br /> . . <br />