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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 />Hazard Exposure Guidelines <br />....................................................... <br />........... ....................... ......................................... ................................................................. <br />SUBSTANCESCAL <br />OSHA <br />......................................................................... .......... <br />1988-89 ACGHi <br />............................................................... <br />.................................................................... <br />........................................................ <br />PEL <br />. ................................................................ ............. .......................................................................... <br />. <br />TLV <br />Benzene <br />............................................. <br />10 ppm (TV) <br />. ..................................................................................... ...................................................................... <br />10 ppm (TWA) <br />................... ........ ......................... <br />25 ppm (EXC) <br />..................................................................................... ............ <br />25 ppm (STEL) <br />........................................................... <br />50 ppm (Ceiling) <br />........................................... <br />. . . . . . . .. . ......................... I ......................... ...... ......................................................................... <br />...................... . ...................... <br />Toluene100 <br />................... <br />................................................................................. ......................................... <br />ppm (TWA) <br />. ..................................................................................... ......................................................................... <br />.......................... <br />100 ppm (TWA) <br />...................... ...................... <br />300 ppm (Ceiling) <br />......... ........................................................................... ........................................................................ <br />150 ppm (STEL) <br />....................................................... <br />Xylene ......................................... <br />. ..................................................... ............................... ................................................................... <br />100 ppm (TWA) <br />...................................................... .............................. .................................................................... <br />-... <br />100 ppm (TWA) <br />....................................... <br />..................... <br />................................................................................... .......................... <br />150 pm (STEL) <br />p <br />.............................................. <br />..................................................... <br />I . . . ......................................................................... ...................................................................... <br />Gasoline <br />......................................................... <br />300 ppm (TWA) <br />. . ............. . . . ........................ ........................................................................ <br />300 ppm (TWA) <br />................... .. <br />.. .................. <br />i <br />................. .. . .. ............. .......... <br />.....500..... ....ppm (STEL) <br />................... ............................ <br />........................................ <br />Etheldibromide <br />................................................. <br />. .............................. ...................................................... i ................................. <br />20 ppm (TWA) <br />................................................... I ................................. .......................................................................... <br />................................. <br />.045 ppm (TWA) <br />................. <br />30 ppm (Ceiling) <br />.. . .... .... ............. * ............. . ....... * ............... .... ... .......................... <br />.13 ppm (STEL) <br />...................... <br />.... * ................. ............. ...... <br />.......... ................... <br />50 ppm (5 min. max peak) <br />. ................................. ................................................... ......................................................................... <br />................ <br />Tetraethyl Lead <br />............ <br />.075 mg/m3 <br />ghm'-3-1-111-1 ... . ... <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 />