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Table 1 <br /> Hazard Exposure Guidelines* <br /> .............................................................t..................................................................................... ....................................................................... <br /> SUBSTANCESCAL OSHA i 1988-89 AC ........... <br /> ........................................................«......................................................I.............................r............................................................. <br /> TLV <br /> ................................................. ....................................PEL .. ........................................................... ............................ .............................. <br /> Benzene 10 ppm (TW) 10 ppm (TWA) <br /> .................................................... ................................................................................. ......... ...................... .................. <br /> 25 ppm (EXQ 25 ppm (STEL) <br /> .........................................................................................................................................................................i�-........................................... <br /> 50 ppm (Ceilin <br /> ................................................. ............................I.................................. ....................... <br /> .............*-......................4"*,*"*,*................ <br /> ......................................................r...............................................I................................................................................................................ <br /> Toluene <br /> 100 ppm (IVA) 1 100 ppm (TWA) <br /> ........................................................... ................................................................................. ................................--......................... <br /> 300 ppm (Ceiling) 150 ppm (STEL) <br /> ........................................................... ......................... ............................. <br /> ...........................................................t............................................................................................................................................................. <br /> Xylene <br /> 100 ppm <br /> IW ppm (MA) <br /> .......................................... <br /> ......................a. .............._150.ppm (STEL) <br /> ..................................... ................................................................................... .............p............................... <br /> ............................................................................................................................................... ............................................................ <br /> Gasoline300 ppm (TWA) 300 ppm (TWA) <br /> .............................................................................................................................................. ........................................................................ <br /> 500 ppm (STEL) <br /> ................................................................ ...................................................................................................................................................... <br /> ....................................................... .....................................................................................................................................4........................ <br /> Etheldibromide 20 ppm .045 ppm (TWA) <br /> ................................................... ...........................................M�.........................:.....................................4................................... <br /> 30 ppm (Ceiling)...................... <br /> .13 ppm (STEL) <br /> ........................................................... ........................................................... .. ......................................................................... <br /> 50 ppm (5 min. max peak) <br /> ............................................................. .....................................................................................................................................................I........ <br /> .......................................I...................... ....................................................................................................................................................... <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 />