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containing two or more fused aromatic rings of carbon and hydrogen atoms. Most PNAs enter the environment via the atmosphere from a variety of combustion processes and pyrolysis sources. Evidence that mixtures of PNAs are carcinogenic to humans comes primarily from occupational studies of workers following inhalation and dermal exposure. Data is unavailable for the oral route of exposure for humans 5. Polychlorinated Biphenyl (PCB) is mixtures of synthetic organic chemicals with the same basic chemical structure and similar physical properties ranging from oily liquids to waxy solids. Due to their non -flammability, chemical stability, high boiling point and electrical insulating properties, PCBs were used in hundreds of industrial and commercial applications including electrical, heat transfer, and hydraulic equipment; as plasticizers in paints, plastics and rubber products; in pigments, dyes and carbonless copy paper and many other applications. More than 1.5 billion pounds of PCBs were manufactured in the United States prior to cessation of production in 1977. Concern over the toxicity and persistence in the environment of Polychlorinated Biphenyls (PCBs) led Congress in 1976 to enact §6(e) of the Toxic Substances Control Act (TSCA) that included among other things, prohibitions on the manufacture, processing, and distribution in commerce of PCBs. This substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion. Repeated or prolonged contact with skin may cause dermatitis and the substance may iss Permissible exposure limits, California Code of Regulations, Title 8, General Industry Safety Orders, Airborne Contaminants, §5155 Santa Fe Road Disposal Site — Health & Safety Plan 15 October 2002 Chemical Name Exposure Limit IDLH Relative Response LEL Route of Entry Anthracene PEL = 0.2 mg/ml Bronchitis, Dermatitis Contact/inhalation Potential Carcinogen Benzopyrene rs PEL = 0.2 mg/ml IDLH = 80 Bronchitis, Dermatitis Contact/inhalation Mg/M3 Potential Carcinogen Chrysene_, PEL = 0.2 mg/ml IDLH = 80 Bronchitis, Dermatitis Contact/inhalation mg/ml Potential Carcinogen Naphtalene PEL = 10 ppm Irritant eyes, confusion, 0.90% Contact/inhalation Malaise, nausea, vomiting Absorption,, inhalation STEL = 15 ppm Phenanthrene PEL = 0.2 mg/ml IDLH = 80 Bronchitis, Dermatitis Contact/inhalation *' mg/ml Potential Carcinogen Pyrene _ PEL = 0.2 mg/ml IDLH = 80 Bronchitis, Dermatitis Contact/inhalation mg/ml Potential Carcinogen Polychlorinated Biphenyl (PCB) is mixtures of synthetic organic chemicals with the same basic chemical structure and similar physical properties ranging from oily liquids to waxy solids. Due to their non -flammability, chemical stability, high boiling point and electrical insulating properties, PCBs were used in hundreds of industrial and commercial applications including electrical, heat transfer, and hydraulic equipment; as plasticizers in paints, plastics and rubber products; in pigments, dyes and carbonless copy paper and many other applications. More than 1.5 billion pounds of PCBs were manufactured in the United States prior to cessation of production in 1977. Concern over the toxicity and persistence in the environment of Polychlorinated Biphenyls (PCBs) led Congress in 1976 to enact §6(e) of the Toxic Substances Control Act (TSCA) that included among other things, prohibitions on the manufacture, processing, and distribution in commerce of PCBs. This substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion. Repeated or prolonged contact with skin may cause dermatitis and the substance may iss Permissible exposure limits, California Code of Regulations, Title 8, General Industry Safety Orders, Airborne Contaminants, §5155 Santa Fe Road Disposal Site — Health & Safety Plan 15 October 2002