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Table I <br /> Hazard Exymure—quidelines* I <br /> ............................................... ........................................................................................................................................ ................... <br /> SUBSTANCES................... .........................CAL OSHA `...........-._198&89..A.....0.... <br /> .......................... <br /> ................................. ..................................... <br /> ........................................................... ....................................PEL................................................. ..............................TLV........................................... <br /> Benzene 10 ppm 10 ppm (TWA) <br /> ............................... .............................................................................................................................................................. <br /> 25 ppm (EXQ 25 ppm (STEL) <br /> ........................................................... <br /> ........................................................................................................................................... ............ <br /> 50 ppm (Ceiling) <br /> ........... <br /> ......................................................L.................................................... ...................................................................................... <br /> ....................... .................................... ..................................................................................................................................... <br /> Toluene 100 ppm (TWA) 100 ppm (TWA) <br /> ........................ <br /> ............................................... ..................................................................................... . ................I................... <br /> 300 ppm (Ceiling) <br /> 150 ppm (STEL) <br /> .............................. ................................................................. ......... ................I...................... .................. ....... <br /> ............................... .................................................................................. ....................................................................... <br /> Xylene ................................... .....................100.ppm...(.T...W....A.....).............. ................1..00..ppm.( WA) <br /> ............. <br /> ...... <br /> 150 ppm (STEL) <br /> .............................................. ................... ...................... ......................... ......................................................................... <br /> ................................................. ................................................................................ ....................................................................... <br /> I Gasoline 300 ppm (TWA) 300 ppm_(TWA).-.....-........ <br /> ...........----............................................................................................................................ ...................................................................... <br /> 500 ppm (STEL) <br /> ................ .................................................................................................................... ..................................................................... <br /> ........................................... ........................ ................................................................................................................................ <br /> Etheldibromide 20 ppm .045 ppm (TWA) <br /> .........................: <br /> .. . ................. ........ . . ............ <br /> 30 ppm (Ceiling) .13 ppm (STEL) <br /> ................ ........... ......................................... ...................................................................... <br /> 50 ppm (5 min. max peak) <br /> ...........-...... ........ ...................................................................................................................................................... <br /> ......................................................... .................................................................................... ..................................................................... <br /> Tetraethyl Lead <br /> .075 mg/m3 .075 mg/ <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 />