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`All of the above are compowids, that may be encountered during excavation Common sense dictates when levels are such that extra <br />protection is necessary. <br />Table 1 <br />Hazard Exposure Guidelines* <br />. . ..... . <br />. ... . ........... . ........ . ... . .... <br />SUBSTANCES <br />CAL OSHA1988-89 <br />....... . .......................... <br />ACGIH <br />. . . . . . ............... .. . ...... <br />PEL <br />T LV <br />. . . ....... . . .... . ... . ....... <br />Benzene . . ...... <br />1 <br />......... . . .... . . . . ...... . . . <br />0 <br />--- pp- <br />........ L5.ppaffXg <br />ST <br />2_5 _ppm SEL) <br />...... . . .... . . ...... . <br />. .... <br />...... <br />............ .... . . ..... . <br />. .. . . ........... . <br />Toluene <br />. . . ........ . ....... . ..... . . ..... . . . . ........... . .... <br />LTYWA) ...... . ............ <br />. .. . .. . . ...... <br />300 ppm &e <br />0 ppm (STEL)--............_ <br />............. - — ---- <br />_Xylene <br />. ............ - .... . . ....... . ..... . . . . ........ . . <br />100 p '.IW .. . <br />. ............ . . . .P . ..... <br />.... . .. ... . .......... . ............... . . ......... ............. <br />100 1E.-(Tw <br />. ... ...... . PE <br />...... .... ... . ........... . ... . ... <br />1 <br />— -- - ------------- - -- ------ . .. ............ - - ------ <br />150 ppm <br />- ................. <br />Gasoline_ <br />. . . ............ . . . .... <br />3 .... . ... . ........... .. <br />. . .... . ....... <br />. ......... (T.... -W . . .. . ............ <br />...... . .. ........ . ..... .......... <br />500 ppm <br />. . ......... . .. . <br />Etheldibromide <br />. ............ .. . .......... . ....... ... <br />20 L).pn('IW <br />. ....... . . - - -------- <br />.04 2m (TWA) <br />. .. . ...... . . . ..... . .......... . ...... <br />.......... . .. . . ..... . ..... . ....... . ..... . <br />............. 2P. 9S ...... . ........ . <br />3 . ...... . ...... <br />S <br />max peak) i <br />. .. . . .. ........... . .. <br />. .... - -- - ---- - ----- . ....... . . . ........ . <br />........ ... . . .... ..... . .. . ........................ <br />Tetraethvl Lead <br />. . ...... . .. ...... . . . ...... . ......... . . ..... . . .................. . . . <br />.075 mg/m3 <br />. ............. ... . . . . ............ . ..... . . ........... . .. <br />.075 mg/m3 <br />`All of the above are compowids, that may be encountered during excavation Common sense dictates when levels are such that extra <br />protection is necessary. <br />