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Table I <br /> Hazard Exposure Guidelines* .............I.......................................... <br /> ......................................................... .................................I....................................................................... <br /> SUBSTANCES CAL OSHA 1988-89 ACGIH <br /> .............................. ...................................I....................................................................... ........................................ <br /> ......................... <br /> ---------- .............................................. ................ ......................... <br /> PEL ..................................... ... ..........:'......------...TLV...................----------- <br /> 4 <br /> top p <br /> Benzene pm (TW) i� lop rn (TWA) <br /> ..........1-..................................................................................................................................... ........................................................................ <br /> 25 pprn (EXQ :�25 ppm (STEL) <br /> .......... ................................................. ............................................ .............................................................li.......................................... <br /> 50 ppm (Ceiling) <br /> ..................................................................................................I......-............................ .................................... ........................ <br /> ................................................;........................................................... ....................... ...................................................................... <br /> 0 <br /> 100 porn (TWA) <br /> Toluene 100 ppm (TWA) <br /> .................................................. ..................................................... .........................: ...... .......................................................... <br /> 300 ppm (Ceiling) 1150 ppm (STEL) <br /> .......... ..................................-------- ......................................................... ....................................".................................................... <br /> ......................................... .......................................................... <br /> ................................................................................................ <br /> J00 ppm (TWA) <br /> Xylene 100 ppm (TWA) OP <br /> ................................................... ........................:........................-......................................................................................... ........... <br /> :;:450 p m (STEL) <br /> p <br /> ...................... ............................. ................................ ...................................................................................I--.............................. <br /> ......................................................... ............................................................................................ .............. ........................................... <br /> Gasoline300 ppm (TWA) ..300 prn (TWA) <br /> ..... <br /> .............................................................. ..................................................................................... ........ ..............p.............-.............. ......... <br /> 1500 ppm (STEL) <br /> .......................................................................... ................................................................................ .................................... <br /> ..................................... -------------------- ......................................................................................:......................................................................... <br /> Etheldibromide20 ppm (TWA) W45 ppm (TWA)----------...............................I......................r......................................................... ......................................................................... <br /> 30 <br /> ppm(Ceiling)... .... . 13 ppm (STEL) <br /> ................................................... -------------"*,*"*,--,--,--* " 'l ...................................... <br /> ................ <br /> 50 ppm (5 min. max peak) <br /> i:....................................................... <br /> ........................................................... A----.. ........... . ...... ......................................... <br /> .......................................... <br /> .................................................................................................... ......................................... <br /> ................... <br /> Tetraethyl Lead .075 mg/m3 .07 5 mg/T2 <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 />