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• <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 200OF The currently established PEL is 0 075 mg/m3 <br /> (approximately 60 parts per billion [ppb]) 1n 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 /> 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 Lower 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 /> 920-119 1 BISSP <br />