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.Wo <br /> Table 1 <br /> Hazard Exposure Guidelines* <br /> ......... ..............................................................................................................................,.......................................................................... <br /> SUBSTANCESCAL OSHA 1988-89 ACGM <br /> ...................................................6.....................................................................................1.......................................................................... <br /> PEL TL V <br /> :................................................:.......................................................................... <br /> Benzene ............. .........................10_PPn!_...T. ........................................._10 PPm_(TWA)................. <br /> ................................................. <br /> .:....................?.......................2S..P.p.!n..(EXC) <br /> ....................................... 25.pPm..(STEL)................ <br /> ...................50.PPm.(Ceiling)................... <br /> ......................................................................... <br /> ........................................ ............ .............................................................................................................................:................................ <br /> Toluene....................................... too PP?n.. A)....................................._100 PP?r! (TWA)................ <br /> _300.............................................................(Ceiling) 150 m STEL <br /> :..........................Pp....................._................. <br /> .............................................. ................................................................................ .......................................................................... <br /> Xylene............................... 100 PPm..(TWA)......................;..............._100 ppm (TWA)................ <br /> .......................... .................. ........r........... ...................................................................... ........._150.PPm (STEL) <br /> ...................... ................... ..... .....................................................................................:.......................................................................... <br /> Gasoline 300ppm (TWA) <br /> 300 ppm A).................................... ..................._ . .....................:............._ . ............... <br /> ............................................................. ...................................... . 500 ppm (STEL) <br /> ......._ <br /> ................ <br /> .............................................................. ........................................... .....................................:............... ....................................................... <br /> Etheldibromide ! ...................._20_PPm_ A) .045 ppm (TWA).......... <br /> ....................................................Y. ......................... .......1. .... <br /> ..................30 ppm (Ceili. <br /> ng).....................`.......................................................... <br /> .13 m STEL <br /> .............. <br /> 50 ppm min:_ma_P�)............................. <br /> ...................................................... <br /> .......................................... .............r............................................................................................................................................................... <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 />