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n <br /> C 5.1.5 Chemical Description of Ethylbe zene <br /> k . <br /> Ethylbenzene is a clear, colorless liquid <br /> Exposure to high concentrations of ethylb nzene vapor may <br /> result in irritation of the skin and mucous membranes, <br /> dizziness, irritation of the nose and throat and a sense of <br /> constriction of the chest . <br /> 1 The PEL for ethylbenzene is 100 ppm in air. <br /> I <br /> i <br /> 5.1. 6 Chemical. Description of Xylenes � <br /> Xylenes are clear, colorless liquids . <br /> Exposure to high concentrations of xylene vapor may result in <br /> eye and skin .irritation. Eye irritation may occur at <br /> concentrations of about 200 ppm. <br /> The PEL for total xylene is 100 ppm in air. ; <br /> j <br /> 5.2 Physical Hazards <br /> The potential physical hazards at the Site during the planned <br /> activities stem from heavy machinery use and the hazardous <br /> nature of excavation work. The potential physical hazards are <br /> listed under Section 5 . 0 . <br /> i <br /> I <br /> 1 <br /> 9 <br /> iy <br /> a <br />