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CHEMICAL EXPOSURE POTENTIAL <br /> CHEMICAL EXPOSURE: Gasoline and components of gasoline <br /> represent the primary exposure risk to <br /> toxics. <br /> ROUTES OF EXPOSURE: Dermal absorbtion <br /> Inhalation of Volatile Organic Compounds <br /> (VOC) <br /> GASOLINE: A liquid mixture of hydrocarbons. An <br /> exposure threshold limit value of 300 ppm <br /> vapor phase. J <br /> I <br /> BENZENE: Colorless liquid, aromatic odor <br /> An exposure TLV of 10 ppm is currently <br /> accepted, however adoption of .a 1 ppm <br /> standard by NIOSH increases the concern <br /> of exposure to benzene. <br /> I <br /> TOLUENE: TLV of 100 ppm vapor phase <br /> XYLENE: TLV of 1.00 ppm vapor phase <br /> MONITORING: An organic vapor- analyzer (OVA) will be <br /> maintained on site to determine if <br /> Volatile Organic Compounds are present. <br /> If monitoring indicates sustained levels <br /> Of VOC's greater than 50 ppm in the <br /> breathing zone, respiratory protection <br /> will be required. <br /> A combustible gas indicator will also be <br /> maintained on site in a proximity to the <br /> drilling operation that if vapors - reach <br /> the Lower Explosive Limit (LEL) for <br /> gasoline, the equipment would go into <br /> alarm mode and the work would cease until <br /> safe conditions could be obtained. <br /> i <br />