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3.3.1.3 Ethylbenzene <br /> Ethylebenzene is an eye, mucous membrane, respiratory tract, and skin irritant. High air <br /> levels can cause central nervous system depression, sense of chest constriction, headache, and <br /> dizziness. Skin contact may cause irritation, inflammation, and first or second degree burns. <br /> 3.3.1.4 Xylene <br /> Depending on exposure factors, inhalation of xylene vapor may produce central nervous <br /> system excitation followed by depression. Exposure to xylene vapor can produce dizziness, <br /> staggering, drowsiness, and unconsciousness. At very high concentrations, it may produce lung <br /> irritation, nausea, vomiting, and abdominal pain. Xylene is not known to possess the same <br /> chronic bone marrow toxicity as benzene, however, liver enlargement and nerve cell damage <br /> have been noted from chronic overexposure above the PEL. Ingestion exposure to xylene can <br /> produce temporary liver damage and should be avoided. <br /> 3.3.2 Exposure Limits <br /> There are exposure limits for the hazardous constituents of concern in these substances <br /> that may be found at the site (Table 1). The primary constituents of concern are benzene, <br /> toluene, ethylbenzene, and xylene. Health risks may be experienced by inhalation or ingestion of <br /> vapor and/or dust,through direct and indirect contact with contaminated soils. <br /> 3.3.2.1 Permissible Exposure Limits (PEL), Threshold Limit Values (TLV), and <br /> Short Term Exposure Limits (STEL) <br /> Table 1 contains the Permissible Exposure Limits (PEL), Threshold Limit Values (TLV), <br /> and Short Tenn Exposure Limits (STEL) for the chemicals of concern. If work shifts are <br /> changed from an 8-hour day, the PEL will be calculated to reflect such a change. <br /> 10 <br />