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Table I <br /> Hazard Exposure Guidelines <br /> . ................................................................... <br /> ............................................................ .................................................................................... ... <br /> SUBSTANCES1988-89 ACGIH <br /> CAL OSHA ......... ............................................................... <br /> ................... <br /> ......................... <br /> PELTLV <br /> .........................................................................................................................................................................................I.................... <br /> 10 ppm (TWA)... <br /> Benzene 10 ppm (TW) <br /> .................................... ....................I.................................. <br /> ................. .......................................... ................. ....................... <br /> 25 Ppm (EXQ ... 25 pprn (STEL) <br /> .......................... <br /> . . ............................ ... ............... <br /> .................................................... ..... ..... ........................ <br /> 50Ppm (Ceiling) ... .. .... <br /> .... ....................... .................................................. ........... .............. <br /> ........................................................... <br /> ........................................................... ....................................... <br /> ...................................................................................................................... <br /> .. <br /> I Toluene 100.ppm..(TWA).. <br /> .. ...... ...... ... .... 10.0.....ppn..(..T...W......A.....). <br /> ...... ...... <br /> ............................................................ ....................... <br /> ..... <br /> 300 ppm (Ceiling) <br /> 150 ppm (STEL)..._......._.. <br /> ... ........................................ ......................................................... <br /> ................................................... ....................................... <br /> ...........-.............. .......................i........................-..........I...................................... ...... ....................................................................... <br /> Xylene 100 PPM.gWA) too ppm (TWA) <br /> ......................... ............................... ................................................................... <br /> ........................................... .................. <br /> (STEL)150_.ppm (S............................ <br /> .................................... ................... <br /> ......................................... ... .... ...... .................. ...... .................... <br /> .................................................... <br /> ....................................................... ................................................................................... ............... <br /> 300 ppm (TWA) <br /> Gasoline300 ppm ...................... ............ ..... ....... ......... ..... ........ <br /> ........................................................... ........ <br /> m <br /> 500 pp (STEL)_...._........ <br /> ....................................... ................. ...— ........... ............................................... <br /> .......... <br /> .................... <br /> ....................... ........................ ..... . ........... ............. ................. .............-................................... <br /> Etheldibrornide 20 ppm...(TWA)........................ .............04.5....pPT...(TWA)... ......... <br /> .................................. ........................................ ............. ...... <br /> 30 ppm (Ceiling) .13 ppm (STEL) <br /> ...........................--,.................................... <br /> ........................... <br /> ......................................................:.......................................................... <br /> ...........................I.................................50.ppm...(.5...m.. i ... ma ..Peak...)............... <br /> ................................................................. <br /> ..................................... .......... <br /> .................................................. .... ............................................................................. <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 />