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Table 1 <br /> Hazard Exposure Guidelines* <br /> __.— ___..�.. _ .... _---•-..__.. _ .._.._....---•----......................... <br /> j <br /> SUBSTANCES CAL OSHA 1988-89 ACGIH <br /> - ------------ _.._.. <br /> PEL <br /> TLV <br /> Benzenes -—------•-•--•-------.................................. <br /> ................._.............. <br /> __._..._..--_.._..._-- 1 <br /> -- - 25 m STEL <br /> 50 m Ceilu7 <br /> Toluene - ; ---•-----.__..-----•-._......._.._.. <br /> .................................. ........ ..__......................1OO..PP_m(TWA�._..........._—._.._._.._._..100pp1�)........................ <br /> 5 <br /> 00 <br /> _._. ..`._..._._._...........3...... ..m...�Ceilin ....._.....__......:`........:.... 150 Ppm (STEL) <br /> .............._...................._............. <br /> Xylene <br /> .........._..............._._.__._. -.:.._1:00 PP_'n (I�X',�_.__ -----1.00_PP._'n ...... <br /> __.... 150 m 5TE <br /> .............................. <br /> -_ L <br /> .................. <br /> ......................._........._.......................... <br /> Gasoline........._._.. .. 300 m --_.._. _ ............................__......_:._....._._.._.........- <br /> i <br /> _........_. . _..........[�P_..__. A� <br /> .........._:....---.....�_ --=-300.[?P..m...�T_W:')........................ <br /> ......... S00 <br /> ........._._......._. m STEL` <br /> _ .P.- ..................... <br /> ...__..:..._..._............ ........................... <br /> Etheldibromide i <br /> ..._.........._............_..._._..-..... 22045.Pp <br /> r --- _._�.._.._ ..__._........ <br /> _......................_..._..........'. 30 m C Bilin ( <br /> ........_.._.._.......-..._.__.PP_.......�.=___ _.__..._..._.._...__......_.- .13.PP ........................ <br /> ....................................... :m min m,,-Lc <br /> ........................._........... <br /> i <br /> Tetraethyl Lead 075 mL/m3 <br /> .075 mg/m_23 <br /> lll of the above are couapounds that may be encountered dudatg excavadoiL <br /> prutecriou is necessary. Couunou sense dictates when levels are such dant extra <br />