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• M <br /> It has been demonstrated that the remaining nine PAHs compounds are non- <br /> carcinogenic, but are associated with a variety of potential health effects. <br /> Acenaphthene, fluoranthene, and pyrene may result in liver damage; fluorene <br /> and naphthalene have been associated with hematological changes; and <br /> acenaphthylene, anthracene, and phenanthrene effects are poorly characterized, <br /> causing generalized toxicity in experimental animals. <br /> PAHs (except naphthalene) are grouped as a class by Cal-OSHA as "coal tar <br /> pitch volatiles," and are regulated as such. The Cal-OSHA PEL for coal tar pitch <br /> volatiles is 0.2 mg/m; . <br /> Naphthalene <br /> PEL/TLV1)= 10 ppm <br /> TLV-STEL(')=15 ppm <br /> Inhalation of naphthalene vapor may cause headache, nausea, and loss of <br /> appetite. Concentrations above 15 ppm produce noticeable eye irritation. <br /> Optical neuritis and injury to the comea and lens have been reported in workers <br /> occupationally exposed to naphthalene. The STEL is based on minimizing eye <br /> irritation. Naphthalene has a strong odor similar to mothballs. <br /> The mean air-odor threshold for naphthalene is 0.084 ppm. Because of the low <br /> odor threshold, respirator break through may occur even when concentrations <br /> are below the PEL. <br /> ENV.:; <br /> A M E R I C A <br /> November 2003 <br /> \\ENVSANFRAN\public\PG&E\PGE-05-01 Stockton MW26R Investigation\MW26 Work Plan\H&S\EXHIBIT B.doc <br />