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Ethylbenzene <br />Ethylbenzene is a flammable, colorless liquid with an aromatic odor. The flash point is <br />59 degrees Fahrenheit, and the currently established TLV is 100 ppm in air. <br />Xylene Compounds <br />These materials are clear liquids with a flash point of 100 degrees Fahrenheit. The TLV is <br />currently established at 100 ppm in air. Xylene compounds are currently under study as <br />possible carcinogens. <br />Organic Lead (Tetraethyllead) <br />A poison, and a solvent for fatty materials. Tetraethyllead was used as a gasoline additive to <br />prevent knocking in motors (leaded gasoline contains 1.1 grams of lead per gallon). It is a <br />colorless liquid, with a flash point of 2000F. The currently established PEL is 0.075 mg/m3 <br />(approximately 60 parts per billion [ppb]) in air. It is insoluble in water, but soluble in <br />benzene. <br />It is not anticipated that the potential levels of exposure will reach personal exposure limit <br />(PEL) or threshold limit value (TLV) limits, but this is based solely on limited available <br />specific information. It is expected that inhalation and dermal contact will be the potential <br />exposure pathways of concern. <br />Should respiratory irritation occur, appropriate air -purifying respiratory protective devices <br />will be worn, with organic vapor cartridges and dust pre -filters, or with high efficiency <br />organic vapor/HEPA stack -type cartridge. Typically, the cartridge will require replacement <br />daily. <br />B. Physical Hazards <br />Existing utilities on the site must be avoided in the process of normal site work. Overhead <br />power lines which may be located throughout the site present a potential for electrical <br />contact. All overhead lines located in the work area will be noted prior to starting work. A <br />minimum distance of 10 feet from power lines will be maintained at all times. Underground <br />920-124.IA/SSP.DOC 4 December 8, 1997 <br />