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i <br /> Table 1 <br /> Hazard Ex <br /> oosure Guidelines' <br /> SUBSTANCES CAL {OSHA <br /> __...... ._. _._,_.. _..�......._....__ ___....._....._ ._._.. . 1988-89 ACGIH <br /> ..................- PEL TLV <br /> Benzene _.. ........... ?P �._...__...._.............._ ....__..._.....10 PPm.,.(TWA.) <br /> ......_........ ............. <br /> Toluene10 <br /> ......___.............................................._.. 0.PP __........._ _.__....._.......PPm._(T. W <br /> _ ............ <br /> 300 ppm .(Ceilin ......... 130 STEL <br /> - ......._ _ .___.........__...PF __.._�._ <br /> ._m___........... ............. <br /> Xvlene <br /> _..................._-,,_ ,.. _.__ ._.. _.. 100m (T� ..._.__....__......_........_.._._....1.OO..P_LM_. < )._.... <br /> ............... <br /> ................._._...-----.. ,__ ..... _ _`_....._........................... 130 m STEL <br /> Gasoline 300 m TWA <br /> PE.._....(__.._._) 300 m <br /> (TWA) <br /> _ ..___........�_.. _ _._. — .. _.._.._ ._.....-.w..............PP_ _.......... <br /> ....._,_..._........._......_....___ _............... .._,. X00 PPM..( <br /> Etheldibromide 20 m Tl 0 5 <br /> .....,.___._......._......_............_.........__......_.._..:.......__...._.._..._.._.........PP_...._L.........:. ...__._�_ _......`5 ppm (TWA) <br /> ...._..._...__. <br /> _.__.._............_.. 31_P_Pn?.(Ceilin .......... ...._ ..... _.__.....:..3..PPm...�STEL�......... <br /> ..................._._...,.___.................... _. ......'......_._'O..PP?T'...(S min. mai peak,�........._....,-. ............................. <br /> Tetraethvl Lead .075 mg/m3 .073 mg/m3. <br /> U of the above are compounds that may be encountered during excavatio sl. Comruon sense dictates when levels are such that extra <br /> protection is neeessarv. <br /> 4 <br />