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. 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 />Table 1 <br />..............................................................._;......................................................................................... <br />Hazard Exposure Guidelines* <br />,.................................................................... <br />SUBSTANCESCAL <br />OSHA <br />1988-89 ACGIH <br />.............................. _............................ <br />PELTLV <br />_,.................................. ................... ............................................................. ;................................................................. <br />.............................. ... <br />Benzene.............._................................_..............._.................._I <br />10 <br />...P.Pm...�T ...._................._......__ .................._..._I <br />.PPm... A�..... .................. .. <br />25..PP.t............ XC) ................................ <br />5 ......... (STEL).........._............ <br />..........................................................................__:.__.. <br />......................50...PP..m...�Ceilin..............................a....................................................._........................................... <br />.................. ...................................................... <br />Toluene.................................................._............................._100...PPm...i'... <br />_............................................................................................................. s....................................................... <br />................... ........ a.......... <br />_........................................ . <br />..........._100._PP...Pt......................... <br />................................................ . .......................... <br />300..PPm...(Ceilin�................................................_150..PP'n...(STEL)...................... <br />........... .................................. .................................................................... <br />Xylene ................................. <br />_.............................................................................................._.......................................................................... <br />............................ _100.. PPm... ��..................................................._100..P..PL''._ <br />................. <br />150 m STEL <br />PP..........(_�.............. a..................... <br />............................................................................ <br />Gasoline......................__......._................_....................._...300..PPm...iT <br />....................................... ....... ......................... ................................................... ............................................................ <br />A�._..__.....................1...................._300..PTm... <br />-........... - ............ .......... <br />...................... <br />........................50., <br />.p..!''...(STEL)............... <br />................................................................._........... <br />Etheldibromide._................_..€.............................._20..PP..m...(T.W <br />€.............................. _.._....................................... ....................................... 1.................... <br />.............................._.....................045..P..Pm._.(TW <br />_....................................... -........... ....................... <br />��..... _. _......... <br />................_...34..PPm (Ceilin....................................._............. <br />1.3.Ppmn STEL)....................... <br />._50..pp..m...(5.min.._max peak)...............1................................._.... <br />................. ................ ....... _....... .......... <br />Tetraethyl Lead <br />.075 mg/m3 <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 />protection is necessary. <br />4 <br />