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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 />Table 1 <br />...Hazard <br />............................................:............................ <br />Exposure Guidelines <br />..............................................*.......................................................................................................... <br />SUBSTANCES <br />CAL OSHA <br />1988-89 ACGIH <br />PEL <br />:..................................................................i................... <br />TLV <br />.......... ..................—............... .... .................... . <br />Benzene................................. .........._...._...._..........__............._10...pPm... <br />..............._................................__....._1�..PPm._ <br />A�......................... <br />........................ .......................................... ............. <br />: 25..P..Pm...�EXC).................... ........... ..s.......................25..pP..!''...(STEL)........................ <br />_................._ <br />.............................. 5�...ppm...(Ceiling) .............................;. <br />........ _.........................._..... ................... ........................... <br />........................... .... ....... ....... _.._.................. <br />Toluene................................. -........._.................................._100..PP..m... <br />........................... __.................................. ................................................d............ <br />)............. ................. <....................._100..P..PTn... <br />............................. ................. ....................................... . <br />A)........... <br />........................_300..pP..m...(Ceilin..................................._..........._1.5.... <br />...n...�STEL�...................... <br />Xylene.................................... _.._............._............................._100...PPm...A�.............................. <br />.................................................................................................................................. <br />................... <br />_......... <br />.._100..P..Pm...A)...................... <br />..................._ <br />5..........0..pPm...STEL).._.................. <br />................................................................................................................... <br />Gasoline <br />.................................................................... <br />................ ....................... ........................................... .................................................................... <br />............ 300..ppm...TWA).................................................._300...PPm._A�_..................... <br />.......................... _.. <br />TW <br />................_500.. <br />ppm ...(STEL)...................... <br />........... ..... -............... .................. ................ <br />Etheld..bromide..........................................._,......._20...PP..m... <br />;.................................................................................................................. ........................................................ <br />A)..................... ........._ ................. <br />............................ ............. . <br />045..P.P...m..._..... ............. <br />.................. ......................... ........................................ <br />. ...................._30..pPm...(Ceilin..............................5....................._.13..P.Pm <br />(STEL)....................... <br />...............................................................S.... <br />.m...�5. min..._m�..Pei)...._.........1..................................................._. <br />Tetraeth I Lead <br />075 m /m3 <br />.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 />