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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 Exposure Guidelines <br />x <br />........................................ ........................................... :...... <br />SUBSTANCES <br />.................................................................... <br />CAL OSHA <br />1988-89 ACGHi <br />PEL <br />..............._..................._.............._.............................._;...................................—.............................. <br />TLV <br />Benzene <br />........_...._......_........... <br />! 10 m TW € <br />...................._PP.......(........_........................_.;........................_PP....._(............_�_............... <br />10 m TWA <br />............................. <br />PP!r!(EXC).............._._.....!'..............._25 <br />25 ppm (STEL) ................. <br />......................._..............._...... <br />50 PPm (Ceiling)..................................................._....................................._... <br />....................... <br />Toluene <br />......................................................k`...................................................... <br />....... .................... ............................... .......................... ............... <br />.......... ..........100 ppm..(TWA)......................:..............._100 <br />.......................................................... <br />ppm (TWA) <br />............................... <br />300 Ppm (Ceiling) <br />............................ :..................._...._PP....._(_..........._)...._......... <br />150 m STEL <br />....................................................... <br />Xylene.................... <br />................................................................................................................................................................ <br />._................................... <br />.... <br />.._............:............_._......................... <br />-.:_........::...._...................._.._._._............................................._......_.... <br />150 ppm (STEL) <br />Gasoline <br />_........._........_. ............. <br />........... _................................................ ............... _............. .................................................................. <br />300 ppm (TWA) <br />........................................................_pp.......(........................._._. <br />.... _ . _ ... <br />300 m TWA <br />............................... <br />............ ............................................... .......................... ...............500_PPm_(STEL....... <br />........ .. <br />Etheldibromide............._........................_0_pPn?_(TWA).......................:. <br />........................._pp.......�'�......................... <br />.045 m A <br />..............._..............._.__;......................_.............................................................. <br />30 m (Ceiling).13 <br />.................. <br />. ppm (STEL) <br />50.ppm (5 min. max peak).........:..........: <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 />