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Table 1 <br /> Hazard Exposure Guideline <br /> Substances Cal OSHA 1988-89 ACGIH <br /> PEL TLV <br /> ------------------------------------------------------------------------ <br /> Benzene 10 ppm (TWA) 10 plain (TWA) <br /> 25 ppm (EXC) 25 ppm (STEW <br /> 50 ppm (Ceiling) <br /> Toluene 100 ppm (TWA) 1041 ppm (TWA) <br /> 300 ppm (Ceiling) 150 ppn (STEL) <br /> Xylene 100 ppm (TWA) 100 ppm (TWA) <br /> 150 ppnj (S7 EL) <br /> Gasoline 300 ppm (TWA) 300 ppm (TWA) <br /> 500 ppm (STEL.) <br /> Possible contaminants that could be f-ncountered as <br /> presently known, <br /> r <br /> s <br /> 5 <br />