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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 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 (TWA) 300 ppm (TWA) <br /> 500 pw (STEL) <br /> Possible contaminants that could be encountered as <br /> presently known. <br /> 5 <br />