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Table 1 <br /> I Hazard Exposure <br /> Guidelines* <br /> SUBSTANCES <br /> CAL OSHA 1288A9 ACGIH <br /> PEL TLV <br /> Benzene 10 ppm 10 pp2LgWA <br /> 25 ppm (EXC) 25 ppm <br /> 50 ppm (Ceiling) <br /> Toluene <br /> 100 ppm <br /> 300 ppm (Ceiling) <br /> Xylene100 ppm CTVN <br /> 100 ppm (TWA —_' <br /> 150 ppm (STEL) <br /> .................. <br /> ..._....._...._.__....----..._.-.-.._..._-...._- <br /> Gasoline <br /> .....................Gasofine 300 ppm (TWAT 300 ppm (TWA) <br /> ............ ........A........ ...... <br /> ................ <br /> ................................................................................................ <br /> Etheldibromide <br /> 20 ppm .045m gw�A) <br /> A <br /> 30 ppm (Ceiling I <br /> .13ppia.LSIEI <br /> ..................................................... <br /> 50 ppm 5 nun. max peak) <br /> .................... <br /> Tetraethyl Lead .075 mg/m3 <br /> .075 ML/m3 <br /> -All of the above are compounds that may be encountered during excavation. Common sense dictates when levels are such that extra <br /> protection is necessary. <br />