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Table I <br /> I <br /> ............................... <br /> Hazard Exposure Guidelines*...................... ........................................... ............................................................ <br /> SUBSTANCESCAL OSHA 1988-89 ACQUI <br /> .................................................................... ............I....................................... <br /> ... ........... <br /> PEL <br /> TLV <br /> .................................................................................................... <br /> ........................................................ ............................................... <br /> 10 <br /> Benzene 10 ppm ( <br /> ........ pprn (TWA) <br /> ................................................. ............................................ .. ....................................................... <br /> 25 pprn (EXQ 25 ppm (STEL-)................ <br /> . . ............................................. <br /> ......................................................... ................................ppm............. ................................ ......... <br /> 50 ppm (Ceiling) <br /> ................................................................................. .............. ............................................... <br /> .............................................................. <br /> .......................................................... ............................................................................................................................................................. <br /> 100 pprn CIVA) <br /> Toluene 100 ppm (TWA) <br /> ............................................................................................ .............. .............. ............. ..................................................................... <br /> 300 ppm (Ceiling).................... 150 ppm (STEL)............ <br /> ................................ ..................... ........ .......... <br /> ",',,............-*.... ....... ...... <br /> .......................................................... ...........................--............................................................................................. ......................... <br /> Xylene 100 pprn (TWA) 1.00_ppm.(TWA) <br /> ..........--................................................ ........................................................................................................................................................... <br /> 150 ppm (STEL) <br /> ............................................................. .................................................................................................................................................. <br /> ........................................................................................................................--....................................................................................... <br /> Gasoline300 ppm (TWA) 300 ppm (TWA) <br /> ........................................................ ............................................................................................................................................................. <br /> 500 ppm (STEL) <br /> ......................................................................................................................................................................................................................... <br /> ............................................................. ............................................................................................................................................................ <br /> Etheldibromide20 ppm (TWA) .045 ppm (TWA) <br /> ............................................................. ............................................................ ................................................ --- - - <br /> ppm (Ceili .13 pprn (STEL) <br /> ..............................................................>..................._30...........................n#....................... ....................................................................... <br /> 50 ppm (5 min. max peak) i <br /> ...................................................... .................. ...................... ........................................................................................................ <br /> ..........---.............. .................................................................................................................. ....................................... <br /> Tetraethyl Lead <br /> .075 mg/m3 <br /> .075 mg/TL----]l <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 />