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Table 1 <br /> Hazard Exposure Guidelines* <br /> SUBSTANCES CAL OSHA 1988-89 ACGH� <br /> PEL TLV <br /> Benzene 10 ppm (TW) 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 ppm (STEL) <br /> Etheldibromide 20 ppm (TWA) .045 ppm (TWA) <br /> 30 ppm (Ceiling) .13 ppm (STEL) <br /> 50 ppm (5 min. max peak) <br /> Tetraethyl Lead .075 mg/m3 .075 mg/m3 <br /> *All of the above are compounds that may be encountered during excavation. Common sense dictates <br /> when levels are such that extra protection is necessary. <br /> 4 <br />