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Table 1 <br /> Hazard Exposure Guidelines <br /> x <br /> SUBSTANCESCAL OSHA 1988-89 ACGH-1 <br /> PELTLV <br /> ................._..................................... ...................................................................................;........................................................................... <br /> Benzene10_ppm_� ..............................................._..a0.ppm (TWA)....._.......... <br /> ............................................... . <br /> 25 ppm (EXC) 25 ppm (STEL) <br /> ............................................ ............................-- ...................................................€........................................... <br /> 50m (Ceiling) <br /> ...................................--...._............._ .................... .Pp <br /> ........................................................... ........... ..................................................................:... ................................................................. <br /> Toluene 100 ppm (TWA) 100 ppm (TWA) <br /> ............I............. ......................... ......................... ............................................................................................................................... <br /> 300 ppm (Ceiling) 150 ppm (STEL) <br /> .............................................................. ............................................................. ..............i.......................................................................... <br /> ................................................ ......... ................................................................................................... ........................................ <br /> Xylene100 ppm (TWA) 100 ppm (TWA) <br /> .............................................................. .....................................................................................i.......................................................................... <br /> 150 ppm (STEL) <br /> ........................................................... .....................................................................................i.........................................---------------------.......... <br /> .................................................. ......................................................................................................... <br /> Gasoline.....................................i................... 300 ppm (TWA) 300_ppm..O V�.'.A).........__... <br /> ...... ......................... <br /> 500 ppm (STEL) <br /> .............................................................. ....................................................................................................................................................... ...... <br /> ................................................... . ........................................................................;.......................................................................... <br /> Etheldibromide 20 ppm (TWA) .045 ppm (TWA) <br /> .......... .............................................. .....................................................................................i.......................................................................... <br /> 30 ppm (Ceiling) .13 ppm (STEL) <br /> ......................................................... .....................................................................................!.......................................................................... <br /> 50 ppm (5 min. max peak) <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 />