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Table I <br /> Hazard Exposure Guidelines* <br /> ....... = <br /> .. .................................................. .. ............................................... <br /> ............................................................. ................................... <br /> SUBSTANCES CAL OSHA <br /> ...1988-89 ACGIH <br /> . .. .................................................. .......................................................... <br /> ..................................... . ............. .T ......................... ..... <br /> PEL <br /> TLV <br /> ............................................... ............................................................................... ............................................................... <br /> Benzene 10 ppm 10 ppm (TW A) <br /> .................*.................. <br /> ...........-....-...................................... ............................................... . .............. <br /> ...................................................... .......................25..ppm.......(.E....X....Q... <br /> ..................... ...............25..pp.m..(.S...T....E....L...).. <br /> ............... <br /> 50 ppm (Ceiling) <br /> ................................................................................................................................................... ..................................................................... <br /> ....................................................... ................................................................................................................................................... <br /> Toluene 100 ppm lw ppm (TWA) <br /> _OY!9.................................................................................(TWA)..._...._. <br /> ....................................................................... <br /> 300 ppm (Ceiling) 150 ppm (STEL) <br /> . .............. <br /> .... .... ppm <br /> .....................*... .................... <br /> .......... .............................. ............. <br /> .............................................. .................................................................................................................................................... ....... <br /> Xylene 100 ppm (TWA) 100 ppm (TWA) <br /> ...................... ..................................................................................................................................................... <br /> 150 ppm (STEL) <br /> ..................................... ............................................................................................................................................................. <br /> ................................................................................................................................ ................................................................ <br /> Gasoline 300 ppm (TWA) 300 ppm (TWA) <br /> ......................... ............................................................................... ......................................................................... <br /> 500 ppm (STEL) <br /> ...............................................................................................................................-................................................................ <br /> ............. ...................... .......................................................................................................................................... <br /> Etheldibromide ppm (TWA) <br /> .045 ppm (TWA) <br /> .............. .................. ......................20. ......... . .................................................................................................... <br /> 30 ppm (Ceiling) .13 ppm (STEL) <br /> .......................................... ................ ................. . . ...................................................................................... <br /> 50 ppm (5 min. max peak) <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 />