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*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 />Table I <br />.......................................................... <br />Hazard Exposure Guidelines* ......................................................................... <br />........ .......... .............. .......... ------------- <br />SUBSTANCES <br />.................................................. <br />CAL OSHA <br />. . . ................................................................................. . <br />1988-89 ACGIR <br />............................................. <br />...................................................... <br />....................................PEL................................................. ...............................TLV........................................... <br />Benzene <br />10 ............... <br />..................................................... <br />........................1.0 .ppm ...OV).. ......................... ............... <br />.. .ppm.....(TW.A....) <br />.............................. .................. <br />25 ppm (EXQ <br />................................................................ ................... .......................................................................... <br />25 ppm (STEL) <br />...................................................... <br />50 ppm (Ceiling) <br />. .................................. ................................................. ......................................................................... <br />.......................... ............. ............ <br />Toluene <br />................................................... <br />.......... ...................................................................... .................................. <br />100 ppm (TWA) <br />..................................................................................... ..................... <br />.................................. <br />100 ppm (IVA) <br />-- ................................................ <br />................................ <br />300 ppm (Ceiling) <br />. ................................... . .................. <br />............. ...... .......... ................... <br />150 ppm (STEL) <br />............................ <br />Xylelle <br />................... . ............................................. ......................................................................... <br />100 ppm (TWA) <br />100 ppm (TVA) <br />.......... ................................................ <br />...................................................... I .............................. ........................................................................ <br />............ .................................... <br />.................... ......... ...................................................... ......................................................................... <br />150 ppm (STEL) <br />.................................................. <br />Gasoline300 <br />.................................................. <br />.................................... - .............................................. ......................................................................... <br />ppm (TWA) <br />......................................................... ........................... ......................................................................... <br />300 ppm (TWA) <br />..................................................... <br />. ..................................................................................... ......................................................................... <br />500 ppm (STEL) <br />-------------------------------------------------------- <br />Etheldibromide <br />...................................................... <br />- --------------------------------------------------------------------------------- .................... <br />20 pprn (TWA <br />............................................................ ) ....................... ......................................................................... <br />........... .......... .. ...................... . <br />.045 ppm (TWA) <br />...................................... ................. <br />30 ppm (Ceiling) i <br />..................................................................................... .............................................................. <br />.13 ppm (STEL) <br />. ...................................................... <br />50 ppm (5 min. max peak) <br />..................................................................................... .......................................................................... <br />Tetraethyl Lead <br />.................................... . ............................................... .......................................................................... <br />.075 mg/m3 <br />.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 />