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3.8 KNOWN CONTAMINANTS OF CONCERN <br /> Highest _ <br /> Concentration and PEL, <br /> Location REL, or <br /> (solid: mg/kg or TLV IDLH PIP <br /> Contaminant liquid: µg/1 (ppm) (ppm) Symptoms and Effects of Exposure (eV) <br /> Benzene 64,000 ug/L 1 1,000 Odor threshold is 34-119 ppm. Eye, nose, and 9.24 <br /> MW-DIS-1 respiratory irritant; giddiness; headache; nausea; . <br /> staggered gait; fatigue; anorexia; lassitude; <br /> dermatitis; abdominal pain; and bone marrow <br /> depression. Carcinogenic; potential significant <br /> contribution to the overall exposure is by the <br /> cutaneous route. <br /> Toluene 110,000 ug/l 100 2,000 Odor threshold is 0.16-37 ppm. Fatigue, 8.82 <br /> MW-DIS-1 confusion, dizziness, dilated pupils, nervousness, <br /> insomnia, and paresthesia. 150 ppm short term <br /> exposure limit and 500 ppm ceiling. Potential <br /> significant contribution to the overall exposure is <br /> by the cutaneous route. <br /> Xylenes 130,000 ug/l 100 10,000 Odor threshold is 20 ppm. Dizziness; excitement; 8.45- <br /> MW-DIS-1 incoordination; staggering gait; drowsiness; eye, 8.56 <br /> nose, and throat irritation; dermatitis; corneal <br /> vacuolization; abdominal pain; vomiting; and <br /> nausea. 150 ppm short-term exposure limit. <br /> TPH-gasoline 1,400,000 ug/1 300 NL Odor threshold is 0.3 ppm. Anesthetic effects, <br /> MW-DIS-1 mucous membrane irritation, headache, blurred <br /> vision, dizziness, and nausea. 500 ppm short-tern <br /> exposure limit. See benzene. <br />