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Table 1 <br /> I Hazard Exam= Guidelines* <br /> .............................................................. ............................................................................................................................................................... <br /> SUBSTANCES CAL OSHA <br /> 1988-89 ACGIH <br /> .................. ............. ..................................................................................... ..................................... <br /> PEL <br /> TLV <br /> .............................................................. ............................................................................................................................................................... <br /> Benzene 10 ppm, (TW) <br /> 10 ppm (IVA) <br /> ............................................................. ............................................................................................................................................................... <br /> 25 ppm (EXQ 25 ppm (STEL) <br /> .............................................................. ................................................................................................................................................................ <br /> 50 ppm (Ceiling) <br /> .............................................................................................................................................................................................................................. <br /> ............................................................................................................................................................................................................................... <br /> Toluene 100 ppm (TWA) <br /> 100 ppm (TWA) <br /> .............................................................. ................................................................................................................................................................ <br /> 300 ppm (Ceiling) 150 ppm (STEL) <br /> .............................................................................................................................................................................................................................. <br /> .............................................................................................................................................................................................................................. <br /> Xylene 100 ppm (IVA) 100 ppm (TWA) <br /> .............................................................................................................................................................................................................................. <br /> 150 ppm (STEL) <br /> .............................................................. ............................................................................................................................................................... <br /> .............................................................. ................................................................................................................................................................ <br /> Gasoline 300 ppm (71WA) <br /> .............................................................. ............................................................... 300 ppm (71WA) <br /> ................................................................................................. <br /> ...................................................................................................................................................................50...0....ppm.(..S...T....E....L....).. <br /> ............... <br /> .............................................................. ..................................................................................... <br /> ..Ethe.ldi.bromide.................. 20 ppm (TWA) .045 pprn (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 <br /> .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 />