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r i <br /> Table 1 <br /> Hazard Exposure Guideline <br /> Substances Cal OSHA 1988--89 ACG1H <br /> pEL TLV <br /> ------------------------------------------------------------------------ <br /> Benzene 10 ppm ('IWA) 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 (Ciel.ing) . 13 ppm(STEL) <br /> 50 ppm (5min. max peak) <br /> Tetraethyl Lead .o75 mg/m3 .075 mg/m3 <br /> All of the above are compounds that may be encountered during excavation. <br /> Common sense dictates when levels are such that extra protection is neces- <br /> sary. <br /> • <br /> 5 <br />