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These materials are clear liquids with a flash poin 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 vaporlHEPA 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 ar a 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 /> utilities may also be encountered during drilling activities. Efforts will be made to locate <br /> such utilities, and to prevent contact during the drilling. <br /> There is a small risk of hazards based upon the L wer Explosive Limit (LEL) of the specific <br /> compounds encountered on the project site. As the majority of the petroleum fuel <br /> hydrocarbon materials have low flash points, it is important to measure the presence of the <br /> 4 <br />