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predominate. Therefore, although the hazards of the identified <br /> hydrocarbons are summarized separately below, additive effects of the <br /> mixture will be taken into consideration when determining established <br /> action levels. <br /> Acetone. Acetone is a skin irritant and a severe eye irritant. Inhalation <br /> of acetone has been reported to cause nasal effects, eye irritation, <br /> respiratory system effects, nausea and vomiting, and muscle weakness. <br /> However, in industry, no injurious effects have been reported other <br /> than skin irritation resulting from acetone's defatting action. The <br /> current Cal/OSHA PEL for acetone is listed as 750 ppm. <br /> 4-Methyl-2-Pentanone (Methyl Isobutyl Ketone rMIBKI). MIBK is <br /> moderately toxic by ingestion and mildly toxic by inhalation. It is very <br /> irritating to the skin, eyes, and mucous membranes, and is a narcotic in <br /> high concentrations. MIBK is a fire and explosion hazard when <br /> exposed to heat, flame, or oxidizers. The current Cal/OSHA PEL for <br /> MIBK is listed as 50 ppm. <br /> Tetrachloroethylene (PCE). PCE is a clear, non-flammable VOC with an <br /> etheral odor. Its major uses include commercial dry cleaning and <br /> metal degreasing. Exposure to PCE can result in effects on the central <br /> nervous system, mucous membranes, eyes, lungs, liver, kidney, heart, <br /> and skin. The most frequent effects include unconsciousness, <br /> dizziness, headache, and light-headedness. Skin contact may create a <br /> dry, scaly, itchy dermatitis. Recent studies suggest that PCE can cause <br /> liver cancer in rats and mice. The current Cal/OSHA PEL for PCE is <br /> listed as 25 ppm. <br /> Semivolatile Organic Compounds (SVOCs) <br /> Most SVOCs, except those known to be carcinogenic, exhibit similar <br /> hazard effects in humans. Skin irritation and effects on the liver, <br /> kidneys, central nervous system, and upper respiratory system <br /> predominate. <br /> Polychlorinated Biphenyls (PCBs) <br /> PCBs are a series of technical mixtures consisting of many isomers and <br /> compounds that vary from mobile oil liquids to white crystalline solids <br /> and hard non-crystalline resins. Technical products vary in <br /> composition, in the degree of chlorination, and. possibly. according to <br /> batch. Generally, PCBs are moderately toxic by ingestion; some are <br /> poisons by other routes. Most are suspected human carcinogens and <br /> experimental tumorigens and exhibit experimental reproductive <br /> 6-7 <br />