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Table 1 <br /> Hazard Exposure Guidelines <br /> SUBSTANCES CAL OSHA 1988-89 ACGIH <br /> ...__.....-._........ ...............................................----_...........................__......................................................................... ...................................................................._.................__...... <br /> i <br /> PEL ...`....................................... <br /> TLV <br /> ..............._.._ . <br /> Benzene . '........................... <br /> _..._10.P.p.. t.... .........................................................._.1 PP..171... �N <br /> ........._._..............................................--_...-..._..............._25..Pp!T'... ..... <br /> ..............................._....._...........�.5..ppm...�STEL�........................ <br /> ___50 ppm„(Ceih <br /> .......... <br /> ........_.................-_..........................._...._.._.rv. ........................._..._y....................................................._............... <br /> ............................ <br /> ............................................................................................................................................................................._......_._.........._..........................................................._................................... <br /> Toluene .. .................-100..Pp!P... A�..............................1..................._100F..P..p'._ A)....................... <br /> ..................................._. 300..............PP..m...�CeilinP ..............................ppm .......... <br /> i <br /> Xylene.................._...........--..__........................................100..........pp!Y'. .._....._..................;....................._100..P..Pm... ...................... <br /> i <br /> 150..ppm...STEL)...................... <br /> .............._......................................................_......_.. .._............................................................................................................................................................................................................ <br /> . <br /> Gasoline .. ............_.399 ppm... 9�..............................1...................._300...ppm.. A�....................... <br /> _.__._................ <br /> .......................-............................._... -.._.................._...................................__................................................... ...................._500..pp..m <br /> ................ <br /> ...... <br /> ....................................................................................._.................................................................................._....................................................................................................................... <br /> Etheldibromide.................._...__..............................2..... .m... p'......................................................045..ppm... �)_............... <br /> _`....._....-.............._3.... '...�Ceiling,)................. <br /> .............i................._1_'..P.pm...�ST1 I,�._.................... <br /> ......................_...._._. <br /> 50..pP'I`._.ft.min.:._ma c..P..e�K..............d. <br /> Tetraethyl Lead .075 m /m3 /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 />