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Benzene <br />I Toluene <br />I Xylet <br />I Gasoline <br />I Etheldibromide <br />Tetraethyl Lead <br />Table 1 <br />CAL OSHA <br />1988-89 ACGIH <br />.............. ...................................................j------------------ <br />..................................................... <br />PELTLV <br />...................................................................................................................................... <br />10 pprn (TW) <br />10 ppm (TWA) <br />25 ppm (EXC} <br />25 ppm (STEL) <br />50 ppm (Ceiling) <br />..................................................................................................................•................. <br />100 m TWA <br />.............p:P............................................a...............,.......... <br />100 m TWA <br />�p................I........................ <br />300 ppm (Ceiling) <br />150 ppm (STEL) <br />........................................................ .t., <br />......,............................................................. <br />....................................................................................................................................... <br />100 ppm (TWA) <br />........... ............................................................................................................................. <br />100 ppm (TWA) <br />150 ppm (STEL) <br />300 ppm (TWA) <br />20 ppm (TWA) <br />30 ppm (Ceiling) <br />... <br />............................ ............................... <br />50 ppm (5 min. max peak) <br />075 mg/m3 <br />300 ppm (TWA) <br />........................................................... <br />500 ppm (STEL) <br />........................................................... <br />.045 ppm (TWA) <br />.13 ppm (STEL) <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 />17rotcc6011 is necessary. <br />