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Table I <br />.............. ......... ............ .............. .......................... - ......... ................................. ............ ........................................ .......... <br />SUBSTANCESCAL OSHA 1988-89 ACGIH <br />.......... ......... ....................... ...................... ........................................... ......... ........ ............................................................ ........... <br />PELTLV <br />...................... ................. ................ ............................................... .................. .......... ............... .............................................. <br />10 <br />Benzene 10 ppm (TW) ppm (TWA) <br />.......... ...... -- ............ ................ ...... ..................................... - ........................ ........... .......... ...... ......................................... <br />25 ppm (EXQ 25 ppm (STEL) <br />......................... ............. ............................................. -- .................................... I ......................................................... ............... <br />50 ppm (Ceiling) <br />.............. ........ .................................. . . ........................................................... -- .................................................... ....................................... <br />............... ............. ................. I ............... ........ .................. ............................................ .. . ......................... ...................................... <br />loluene100 ppm (TWA) i• 100 ppm (TWA) <br />.................................... . ............ .................. ...... ­-­- .......................... .......... ......................................................................... <br />-300 ppm (Ceiling) 150 . .........p(STEL) <br />............ <br />- ----------- ------------------------ -- ...................... .......... ...............pm...................... . <br />......................................................... .................................................. .............. <br />Xylene 100 ppm (TWA) 100 ppm (TWA) <br />............................ ................................ ............................. - ppm ............................ .................................. .............. <br />150 ppm (STEL) <br />.............................................................................. ... ...... <br />..................... ...... ................................. . ................................ -------------------------------- - <br />Gasoline300 ppm (TWA) 300 ppm (TWA) <br />............................... ................................................. I ........................................ ........... .................... -.-- ............... <br />500 ppm (STEL) <br />.................. .................... .................... .................................................................... ............................... ............................ ----------- <br />........................................................... ............................................. ............................ ..................................................... ................. <br />Etheldibromide20 ppm (TWA) .045 ppm (TWA) <br />........................................ ......................................... ........................................ ............ ............................................................. <br />30 ppm (Ceiling) <br />.13 ppm (STEL) <br />............................................................ I ------------ <br />50 ppm (5min. max peak) <br />.............................................. ................................ .............................................. .............................................................. .......... <br />.......................................... ............. ...... ................... ........... .............................................. I ........... .......................................... ................... <br />Tetraethyl Lead .075 nig/nO .075 rng/m3 <br />*Ali 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 />