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Diesel <br /> REL PEL TLV STEL IDLH <br /> N/A 5 mg/m3 N/A N/A N/A <br /> Routes of Skin and eye contact, inhalation and ingestion. <br /> Exposure: <br /> Symptoms: Dizziness, respiratory and eye/skin irritation, suffocation. <br /> Target Organs: Eyes, gastrointestinal tract, lungs, respiratory system and skin. <br /> POLYCYCLIC AROMATIC HYDROCARBONS (PAHs) <br /> PAHs have been detected in the soil at the Site. PAHs constitute a large class of <br /> compounds that are formed as a result of incomplete combustion of organic <br /> matter. They are also common components of crude oil and its products <br /> including creosotes (used to protect wood), and asphalt (used for road paving). <br /> Because of their affinity for organic matter and low solubility in water, PAHs in <br /> general, are relatively immobile in soil. The higher molecular weight PAHs (i.e., <br /> benzo(a)pyrene) tend to remain tightly bound in soil. Due to their high affinity for <br /> organic matter, the physical fate of PAHs often depends on the transport of <br /> particulates by surface water and air. <br /> Exposures may occur through inhalation of vapors or dusts and through direct <br /> skin or eye contact with vapors or dust. Since PAHs are relatively immobile in <br /> the soil, the potential for human exposure to these compounds is minimal. <br /> Exposures may occur as a result of vapors or dust generated during soil boring <br /> and sampling activities. <br /> Among the MGP residues, PAHs are of concern due to their potential <br /> carcinogenic effects. Of the 16 PAHs compounds, the following seven have been <br /> identified as probable human carcinogens by the USEPA: <br /> • benzo(a)anthracene $ benzo(a)pyrene <br /> • chrysene $ indeno(1,2,3-c,d)pyrene <br /> • benzo(b)fluoranthene $ dibenzo(a,h)anthracene <br /> • benzo(k)fluoranthene <br /> Most of the toxicological studies that have been conducted on PAHs have <br /> focused on carcinogenicity, with emphasis on the carcinogenic effects of <br /> benzo(a)pyrene which has been found to cause skin and lung cancer in animals. <br /> ENV.:: <br /> A N E A I C A <br /> November2003 <br /> \\ENVSANFRAN\public\PG&E\PGE-05-01 Stockton MW26R Investigation\MW26 Work Plan\H&S\EXHIBIT B.doc <br />