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Table I <br /> 1 Hazard Exposure Guidelines* <br /> .............................................................. <br /> ................................................... ................................................. <br /> SUBSTANCES ......................._CAL OSHA ..... 1988-89 ACG......................*.................... <br /> ..................... <br /> ................................................. <br /> pEL <br /> TLV <br /> ............................................................ ............*..........*........................ <br /> 10 ppm (TWA)............... <br /> Benzene 10 ppm (TW) .................. <br /> ..............................................................?.................................................................................... ...................................... <br /> 25 ppm (EXQ 25 pp (STEL) <br /> ...................................................................................................................................................................... ..._m.. . ................ <br /> 50ppm (Ceilin <br /> ................................................................................................................. .................. ....................................................................... <br /> .............................................................................................................................................................................................. <br /> Toluene 100 ppm (TWA) 100 ppm (TWA) <br /> ............................................................................................................................................. ........................................................................ <br /> 300 ppm (Ceiling) 150 ppm (STEL)................ <br /> ...................................................x. I................................... <br /> ................................................ ................................................................................ ........................................................ ............ <br /> Xylene 100 ppm (TW 100 ppm (TWA) <br /> .. .....!9.....................i <br /> ............................................. ...........................I. .......... ....... ............. <br /> 150 ppm (STEL) <br /> ...................................................... .......... ................................................................................................................0............................. <br /> ................................................................. ...................................................................................0..................6.................................. <br /> Gasoline 300 ppm (TWA) 300 ppm (TVA) <br /> .. . ......................................... .................................................................................. .....................0..................................0.0............. <br /> 500 ppm (STEL) <br /> .................. ................................... .........................................................................................................................0.0.......................... <br /> ........................................................... .......................................................................................................................................................... <br /> Etheldibromide 20 ppm (TWA) <br /> .045 ppm (IVA) <br /> .................................................... ....................1-101-111,1111""""Ill"",**"*"**10*1""""""*........... .......0-............................................................. <br /> .............................................................. ....................3.0..ppm.......(C....e...i..l..i.n...g...).........................................13.pp.m..(S...T....E....L....).. <br /> .. <br /> 50 ppm (5 min. max peak) <br /> ............................................ .............. .................... .............................................................................................................................. <br /> .........................].................................................................................................. ............................... <br /> Tetraethyl Lead <br /> .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 />