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, <br /> Table 1 <br /> Hazard Exposure Guidelines <br /> .............................................................. ........................................*.........................................j.......................................................................... <br /> SUBSTANCES CAL OSHA 1988-89 ACGIH <br /> ............. ......................................... .......................................................................................................................... <br /> .PEL <br /> f.............................. �.............................. <br /> Benzene......................................f.........................10.ppm.(TW) 10 PPm..(TWA) <br /> ............................................................... ........................ <br /> .............. <br /> ...... <br /> ....................................}.......................25..PP!..!. (EXC)........................;................25_PPn!..(STEL)................. <br /> .............................................................. ....................50 ppm (Ceiling) € <br /> ..........................;.......................................................................... <br /> ............................................... ............................................................................................................................................................... <br /> Toluene100 ppm (TWA) j 100 ppm (TWA) <br /> ..............................................................p............................................................................................................................................................... <br /> .............................................x..................300 ppm (Ceiling)...................................150 ppm (STEL) <br /> ................................................ <br /> i <br /> .....................................................................................i.......................................................................... <br /> ..........................I...pp.......�.. ) € 100 m TWA <br /> Xylene.......................................... . 100 m A...................................................pp......(................................ <br /> 150 ppm (STEL) <br /> ..............................................................!........................_........................................................... <br /> .......................................................................... <br /> i <br /> i <br /> Gasoline 300 ppm (TWA)......................�......... 300 ppm (TWA)................ <br /> ..............................................................r............................................................ . . ........ <br /> 500m <br /> ..............................................................a.....................................................................................j..........................pp...... STEL)............... <br /> i <br /> Etheldibromide ;....................._20 Ppm (TWA).......................�..... .045 ppm..(TWA)............... <br /> ........................ <br /> x....................30 ppm.(Ceiling) .13 pm STEL <br /> .. ...................................... ......................._pp ( ) <br /> 50 ppm (5 min. max peak) ' <br /> ..............................................................5............................................................................................................................................................... <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 />