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Table I <br /> Hazard Exposure Guidelines* <br /> .............................................................. ..................................................................................... <br /> SUBSTANCESCAL OSHA 1988-89 ACGIH <br /> ............................................................ f.................................................................................................................................................................. <br /> PELTLV <br /> .............................................................. ................................................................................................................................:.............................. <br /> Benzene10 ppm (TW) 10 ppm (TWA) <br /> .............................................................. .............................................................................................................................................................. <br /> 25 ppm (EXQ 25 ppm (STEL) <br /> .............................................................................................................................................................................................................................. <br /> 50 ppm (Ceiling) <br /> ............................................................................................................................................................................................................................. <br /> .............................................................. ................................................................................................................................................................. <br /> Toluene100 ppm (TWA) 100 ppm (TWA) <br /> . <br /> .............................................................. ............................................................................................................................................................... <br /> 300 ppm (Ceiling) 150 ppm (STEL) <br /> ..............................................................I..................................................................................... <br /> .............................................. <br /> .............................................................. ..................................................................................... <br /> Xylene100 ppm (TWA) 100 ppm (TWA) <br /> ..............................................................4.....................................................................................: <br /> .......................................................................... <br /> 150 ppm (STEL) <br /> .............................................................. ................................................................................................................................................................ <br /> .............................................................. ................................................................................................................................................................ <br /> GasoUne300 ppm (TWA) 300 ppm (TWA) <br /> ............................................................................................................................................................................................................................... <br /> 500 ppm (STEL) <br /> ............................................................................................................................................................................................................................... <br /> .............................................................. ............................................................................................................................................................... <br /> Etheldibromide20 ppm (TWA) .045 ppm (TWA) <br /> .............................................................................................................................................................................................................................. <br /> 30 ppm (Ceiling) <br /> .13 ppm (STEL) <br /> .............................................................. ..................................................................................... <br /> 50 ppm (5 min. max peak) <br /> .............................................................. <br /> .............................................................. .....................................................................................i.......................................................................... <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 when levels are such that extra <br /> protection is necessary. <br /> 4 <br />