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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 />Table I <br />............. ......................... ............. <br />1 Hazard Exposure Guidelines* <br />......................................................................... <br />........... <br />SUBSTANCES <br />CAL OSHA <br />.............................................................. ...................... <br />1988-89 AC <br />.................................................................... <br />................................................... <br />................................. <br />PELTLV <br />................................................................. ................. <br />...................... ................................................. <br />Benzene <br />10 ppm (TW) <br />..................................................................................... <br />10 ppm (TWA) <br />........................................................................ <br />............................. ......................... <br />? <br />25 ppm (EXQ <br />25 ppm (STEL) <br />......................................................... <br />................................... ................................. ............... <br />......................................................................... <br />........... . ....... . ......................... <br />50 ppm (Ceiling) <br />...................................................................... ........... <br />......................................................................... <br />..................... <br />. ..................................................................................... <br />ppm.. A) <br />......................................................................... <br />(TWA)................ <br />..T.o.l.uene...........................................................100 <br />........ <br />........................ <br />................1..00 ..ppm .............. <br />..................................................... <br />300 ppm (Ceiling) <br />................................................................................. <br />150 pp(STEL) <br />. .................................. <br />..................................................... <br />Xylene ...................................... <br />...................................................................................... <br />100 ppm (TWA) <br />.............. .............................................................. <br />..... .. ...... . . ........................... <br />100 ppm (TWA) <br />....... - ........ ......... .............................. <br />................ .............. ....... .......... <br />................. ............................................................. <br />150 ppm (STEL) <br />........................................................................ <br />........................................ .................. <br />. ....................... .................................... ........................ <br />.......................................................................... <br />Gasoline300 <br />..................................................... <br />ppm (TWA) <br />. ..................................................................................... <br />300 ppm (TWA) <br />................................................................. <br />.......... <br />................... ........................... ......................... <br />500 ppm (STEL) <br />.......................................................................... <br />........................................................... <br />Etheldibromide <br />........................................................ <br />..................................................................................... <br />20 ppm (TWA) <br />..................................................................................... <br />.......................................................................... <br />.045 ppm (TVA) <br />.............................................................. <br />..................................................... <br />30 ppm (Ceili <br />............. ; ........................ ........ ....... P4 .................. <br />.13 pprn (STEL) <br />.................................. <br />.................................................... <br />50 ppm (5 min. max peak) <br />.......................................................... .......................... <br />......................................................................... <br />......................................................... <br />Tetraethyl Lead <br />......................... ........................................................... <br />.075 mg/m3 <br />......................................................................... <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 />