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.......................................................... -- <br />Benzene <br />.......... - ... .................................. . <br />.................................. .......... - <br />-1-1-- ..................... --- ............... <br />...................................................... <br />Toluene <br />.......... 11 ................................................. <br />................... .................. ..................... <br />................. ................. <br />Xylene <br />...................................... .......... ......... <br />. I .... -1- ............................................... <br />Gasoline <br />0 <br />Table I <br />Alazard E <br />PEL <br />....................... .................... <br />10 ppm (TW) <br />................................................ <br />25 ppm (EXQ <br />.................. .............. <br />50 ppm (Ceiling) <br />...................... .............. -., <br />............................................... <br />100 ppm (TWA) <br />....................................... <br />300 ppm (Ceiling) <br />.......... <br />40 <br />TLV <br />........................ * .......... <br />10 ppm, (TWA) <br />...................................... - <br />25 ppm, (STEL) <br />......................................... ......................... <br />................ .................................. <br />................. ...... ....................... <br />100 ppm (TWA) <br />..................... ............................. <br />........................150 ppm (STEL)........................................... <br />.................................................................. .................................................... <br />100 ppm (TWA) 100 ppm (TWA) <br />............. ...................................... ............ .............................................. <br />150 ppm (STEL) <br />.................................. ........... - .................. ........................................................... <br />........................... . ........................................... ....... -, .......... I ............................................. <br />300 ppm (TWA) 300 ppm (TWA) <br />..................... ...... ......... ....................................................... ............................ ........ <br />500 ppm (STEL) <br />........................................................................ ......... ........... .................................................. <br />................................................... ............... ....................... - ........... -- ............................ ......................................................................... <br />Etheldibromide 20 ppm (TWA) .045 ppm (TWA) <br />..... . .... - ...... ............................. ................................................................. ........... ............................................................ <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 />