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Table 1 <br /> Hazard Exposure Guidelines* <br /> ...........-----....... — __..._.......... <br /> — —..... ........ <br /> i <br /> SUBSTANCES CAL OSHA 1988-89 ACGIH <br /> PEL TL--V- <br /> Benzene —1010�1'mA�..._...... <br /> '_—.—..25 PMffX__��...._..._._... 25 PPn`_(SEL __............ <br /> 50 ppm —_. <br /> __ _ _—.....—_ __......... <br /> —_-----......... <br /> i <br /> Toluene 100 ppm-...._..._A 100..PPmffrW I...—............. <br /> 300ppm (Cei . --- 150 ppm (STEL.._._.......... <br /> Xene —.—' -- 100 ppm1'� 100 PPn?. A�_......_._........ <br /> 150 P�._�STEL�..............._ <br /> GasolineTW <br /> —....... 300 _p ��.....—.._... -- 30�pE._ �.—_........... <br /> 50 ...—........ <br /> 3 <br /> d <br /> Etbeldibromide 20 PPm.�TW''�._..—_._—.... 045 PFM —_........ !1 <br /> 30 ppm Ceilin 13 ppmT1 <br /> ---—-- ........ 1 <br /> q <br /> --- 51 2nm (5 min. max pe�..._..! <br /> Tetraethyl Lead .075 mg/m3 .075 mg/ <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 />