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4.2. Toxicity Considerations, Petroleum Substances <br /> All individuals should be aware of appropriate health precautions. When high <br /> concentrations of petroleum hydrocarbon vapors are inhaled, symptoms of intoxications <br /> may result. These symptoms range from simple dizziness to unconsciousness. Human <br /> exposure to benzene concentrations in gasoline vapors in excess of 150 ppm may cause <br /> headache, weariness, and loss of appetite. Vapors at high concentrations may cause <br /> smarting of the eyes and dermatitis. While benzene appears to be poorly absorbed through <br /> skin care will be exercised to minimize exposure to these substances. Use soap and water to <br /> remove any petroleum products that contact skin. <br /> The recommended threshold limit values are shown in the table below. <br /> Threshold Limit Values <br /> Substance CALOSHA PEL1 ACGIH TLV2 NIOSH REL3 <br /> Benzene I ppm 10 ppm 0.1 ppm <br /> Gasoline 300 ppm 300 ppm - <br /> Heating <br /> Heating Oil Not Applicable Not Applicable <br /> 1 CALOSHA PEL— California Occupational Safety and Health Administration—Permissible Exposure <br /> Limits. <br /> 2 ACGIH TLV— American Conference of Governmental Industrial Hygienists—Threshold Limit Values. <br /> 3 NIOSH REL— National Institute for Occupational Safety and Health—Recommended Exposure Limits. <br /> 4.3 Flammability and Combustibility Considerations <br /> Flammable and combustible vapors are likely to be present in the work area. Precautions <br /> will be taken to eliminate all potential sources of ignition to prevent the discharge of static <br /> electricity during venting and to prevent the accumulation of vapors. <br /> HIK2, Inc. /SEMCO Page 5 <br />