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Table 1 <br /> Hazard Exposure Guidelines <br /> SUBSTANCES CAL OSHA 1988-89 ACGIH <br /> PETLV <br /> Benzene 10 m . ... ........... - ......_. <br /> 25 ppm _..-..._ ---_...25..PPL''_.(S <br /> . <br /> )_._..__...._ <br /> _...................._._.__............. • _._.........._ 50...PP.Pm...(Ceilin ...........__.._........ _. _._._.__. _..................... <br /> Toluene - ---....._100...PPmSTWA)........._......_-. ................__1�O..PPn'... ��.................. <br /> --- -300...P.Pm�Ceilin _..-_.._..__......._..-- 150_PP..m(STEL).........._.......... <br /> ............................._............................................_.._..........._................_.._............_......_.._........_.................._............_......_.._........_...........__..................._................................................ <br /> Xylene..............................._.__.._......__........_..............---100.PP..R'... A�....._. _............ 100..PPm._ '�).._................... <br /> — .-....... O..PPR...STEL)..................... <br /> Gasoline3000 PTE._ p`�_.....__........... - - 300p (.7W <br /> �....._. . <br /> --..._.._500..PPm (STEL)_.._............... <br /> Etheldibromide _.. ZO..PP..m._ ��........__..._._..__..»......_.._..._....:045pp..m... ''_'�_.................... <br /> .. ............ PP (Ceil... ._...................5...... <br /> __. __....:..._3 ppn.....(STEL�............_._._. <br /> '..�..P.Pm..(5.min.:._mX..Pe �........_..... <br /> ....._._...---.................................._ . <br /> Tetraethvl Lead .075 mg/m3 .075 m, /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 />