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Table 1 <br /> Hazard Exposure Guidelines <br /> SUBSTANCESCAL OSHA 1988-89 ACGIH <br /> PELTLV <br /> ..................................................._.........................................................__.....................—.................................................4......................................................................_.......................... <br /> Benzene10...pP..m... ...........................................................1o...P..P!T'...�TWA�................. <br /> ........._........................_........................................__..:..................._. <br /> ............._..................................._.....................: <br /> ..............................._25..pp..'n... X )................................. ....................._25..PPF''...STEL).........._............ <br /> 50..pPn'...�Ceilin ......................... .........._......_........................-............................................. <br /> ................................................................................._..................................................................................................................4.................................................................................................. <br /> Toluene100...pPm_. ��...............................a....................._100..P..PM.. ��....................... <br /> 300...pprF...�Ceilin� 150..PPm...STEL)...................... <br /> Xplene..._....... i.............................100...P..P..m... A�...................._...............................100...pP. F ._�T ��................_..... <br /> ...................._............................................................:.................................................................................................................... <br /> ....._150..PPm...STEL)...................... <br /> ......................................................._................................................................................................................................... ......................................................................................._.....- <br /> Gasoline............................................................................_300...p. ._�TWA� ...................._300...ppm.... A�..._.................. <br /> ................................................................................................................................................................................................ <br /> 500.ppm...(ST EL................. <br /> ................................................................................ ................................................................................................................................................................................................................... <br /> Etheldibromide......................................................._2Qm...pp.. ..�TWA�........_.............................................045..p.p...T....�TW��................. <br /> .............................. <br /> ............................................................................_....._. <br /> ........ 30 ..............................i.......................13..PPm...STEL....................... <br /> ......................................................................................_50..P.P...m...�5 min. m�..P�..............t....................................................... <br /> Tetraethyl Lead .075 mg/m3 .075 mg/m3 <br /> ' <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 />