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E Task(s) Chemical PEL/STEL/IDLH Known Signs/Symptoms (soil, water, air, etc.) Concentration 200 ppm Ceiling tremor, somnolence, nausea, IDLH 1,000 ppm vomiting; dermatitis; cardiac arrhythmia, paresthesia; liver damage; potential occupational carcinogen Tetrachloroethene PEL-OSHA 100 ppm Irritation of eyes/nose/throat; (PCE) 200 ppm Ceiling nausea; flush face/neck; vertigo, 300 ppm (5 -min max dizziness, incoordination; in any 3 hrs) headaches, somnolence; skin erythema; liver damage; IDLH 150 ppm potential occupational carcinogen 1,1,1 Trichloroethane PEL 350 ppm Irritation of eyes/skin; (1,1,1 -TCA) IDLH 700 ppm headaches, lassitude, central nervous system depressant, poor equilibrium; dermatitis; cardiac arrhythmias; liver damage 1, 1 -Dichloroethene PEL-OSHA none Irritation of eyes/skin/throat; (1,1-DCE) (previously 1 ppm) dizziness, headaches, nausea; IDLH N.D. dyspnea (breathing difficulty); liver/kidney disfunction; pneutits; potential occupational carcinogen 1,1-Dichloroethane PEL-OSHA 100 ppm Irritation of skin; liver/kidney (1,1 -DCA) IDLH 4,000 ppm disfunction; depression of the central nervous system Dichlorodifluoro PEL-OSHA 1,000 ppm Dizziness, tremors, methane IDLH 50,000 ppm unconsciousness, cardiac (Freon 12) arrhythmia, cardiac arrest 1,1 dichloro- 1 -f luoroethane (Freon 141 b) 1,1,2 trichloro-1,2,2 trifluoroethane (Freon 113) Trichlorofluoro methane (Freon 11) Acetone PEL-NIOSH 250 ppm Irritation of eyes/nose/throat; PEL-OSHA 1,000 ppm headaches, dizziness, central IDLH 2,500 ppm nervous system depressant; dermatitis Methane TWA 1,000 ppm At high concentrations methane acts as an asphyxiant without other adverse effects.