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Health and Safety Plan, Subsurface Investigation Potential New Court Site, Stockton, California sensation of prickling, tingling, or creeping on the skin that has no objective cause. Exposure to higher concentrations may cause headache, nausea, dizziness, dilated pupils, and euphoria. In severe cases, exposure to toluene may cause unconsciousness and death. The liquid is irritating to the eyes and the skin. Contact with the eyes may cause transient corneal damage, conjunctival irritation, and burns if not promptly removed. Repeated and/or prolonged contact with the skin may cause drying and cracking. Toluene may be absorbed through the skin in toxic amounts. Ingestion causes irritation of the gastrointestinal tract and may cause effects resembling those from inhalation of the vapor. Chronic overexposure to toluene may cause irreversible liver and kidney injury. Both the OSHA PEL and the ACG1H TLV are 50 ppm. Ethyl Benzene - Ethyl benzene vapor is severely irritating to the eyes and to the mucous membranes of the respiratory system. Sustained inhalation of excessive levels can cause depression of the central nervous system (CNS) characterized by dizziness, headache, narcosis, and coma. Skin contact with liquid ethyl benzene causes irritation; dermatitis and defatting can also develop. The acute oral toxicity of ethyl benzene is low; however, ingestion of it poses a serious aspiration hazard. Aspirating even a small amount into the lungs can result in extensive edema (lungs filled with fluid) and hemorrhaging of the lung tissue. No systemic effects are suspected at the levels that produce pronounced, unignorable, disagreeable skin and eye irritation. The established PEL is set well below this intolerable level. The Cal/OSHA PEL and the ACGIH TLV are both 100 ppm. Xvlene - Liquid xylene is a skin irritant that causes itching, dryness, and defatting. Prolonged contact may cause blistering. Inhaling xylenes can depress the central nervous system (CNS). Ingesting xylenes can result in gastrointestinal disturbance and possibly hematemesis (vomiting blood). Effects on the eyes, kidneys, liver, lungs, and the CNS are also reported. Both the Cal/OSHA PEL and the ACG1H TLV are 100 ppm. 5.3.3 MTBE MTBE is present in gasoline as a performance-enhancing agent. MTBE is moderately irritating to the eyes and skin and exhibits moderate toxicity via inhalation. MTBE has no established OSHA PEL, but the ACG1H has established a TLV of 40 ppm. Protection from MTBE inhalation exposure can be provided through the use of engineering controls and air purifying respirators with organic vapor Project 104290.19.01 17 January 2009