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EXHIBIT B <br /> Chemicals That May Exist at the Site <br /> Based on past site uses and previous studies, the constituents that are most <br /> likely to be encountered in groundwater include aromatic hydrocarbons and total <br /> petroleum hydrocarbons (TPH). The monocyclic aromatic hydrocarbons <br /> principally include benzene, toluene, ethylbenzene, and xylenes (BTEX). TPH <br /> principally includes gasoline and diesel. TPH principally includes gasoline and <br /> diesel. Pertinent information regarding these compounds is outlined below. <br /> MONOCYCLIC AROMATIC HYDROCARBONS (BTEX) <br /> Benzene <br /> REL PEL TLV STEL IDLH <br /> 0.1 ppm 1.0 ppm 1.0 ppm 5.0 Carcinogen <br /> Routes of Exposure is readily accessible to the blood through the skin. Other routes of <br /> Exposure: exposure include inhalation and ingestion. <br /> Symptoms: Headaches, burns, skin and eye irritation, dizziness, cramps, muscle <br /> twitching, nausea, convulsions, unconsciousness and even death. <br /> Target Organs: Central nervous system, blood, skin, bone marrow, respiratory system, <br /> cardiovascular system, and eyes. <br /> Toluene <br /> REL PEL TLV STEL IDLH <br /> 100 ppm 100 ppm (300 100 ppm N/A 2,000 ppm <br /> ppm ceiling) <br /> Routes of Absorption to the blood through the skin and eyes, inhalation and ingestion. <br /> Exposure: <br /> Symptoms: Confusion, euphoria, pupil dilation, lacrimation, nervousness, headaches, <br /> insomnia, paresthesia, dermatitis, photophobia, skin and eye irritation, <br /> muscle fatigue, unconsciousness and even death. <br /> Target Organs: Central nervous system, skin, liver and kidneys. <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 />