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Table 1 <br /> Hazard Exposure Guidelines* <br /> SUBSTANCES CAL OSHA 1988-89 ACGIH <br /> PEL TLV <br /> Benzene 10 ppm 10 ppm :A <br /> 25 ppm (E` Q 25 ppm (STEL <br /> — 30 poct�(CeilingL <br /> Toluene 100 ppm ("IWA) 100 ppm (TWA) <br /> 300 ppm (Ceiling) 150 ppm (STEL <br /> Xylene 100 ppm CIW-k) 100 ppm (TWA) <br /> 150 ppm (STEL <br /> Gasoline 300 ppm A) 300 ppm A <br /> 300 ppm STEL <br /> Etheldibromide 20 ppm CIVVA) .045 ppm Crw-al) <br /> i 30 ppm (Ceiling) .13 ppm (STEL) _ <br /> 30 ppm (5 min. max peak) <br /> Tetraethvl Lead .075 mg/m3 .073 mg/m3 <br /> '.�dl of the above are compounds that may be encountered during excavation. Common sense dictates when levels are such that earn <br /> Protection is uecessan'. <br />