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0 <br />C O N T R A C T O R S <br />BALCH <br />PETROLEUM <br />& BUILDERS, INC. <br />C.L. #396575 A/B/C - 10 HAZ <br />• <br />Gasoline and Diesel Fuels: Gasoline is a complex blend of petroleum hydrocarbons <br />and is primarily composed of paraffins, napthenes, aromatics, and oleins. Gasoline is a <br />colorless to red liquid with a petroleum odor. It is a flammable liquid with high volatility and <br />its vapors are denser than air. The eight-hour Threshold Limit Value (TLV) for inhalation of <br />gasoline vapors recommended by the American Conference of Governmental Hygienists is <br />300 ppm and the Short -Term Exposure limit (STEL) is 500 ppm. <br />The inhalation of petroleum fuels may lead to dizziness, excitement, drowsiness, and <br />a lack of coordination. In open areas, ventilation is usually adequate to minimize <br />prolonged breathing of high gasoline vapor concentrations. Gasoline containing <br />BTEX may be partially carcinogenic in laboratory animals. A hazard assessment of <br />these compounds is listed below. <br />When certain proportions of a combustible vapor are mixed with air and a source of <br />ignitions is present, an explosion can occur. The explosive range of gasoline <br />concentrations is 1.4% to 8%. The lowest percentage at which an explosion will <br />occur is the Lower Explosion Limit (LEL.) Gasoline has a flash point of -45 degrees <br />C or -49 degrees F. Extreme caution must be taken to prevent sources of ignition <br />from coming in contact with gasoline vapors. <br />AROMATIC PETROLEUM DISTILLATES: <br />COMPOUNDS <br />TLV <br />Benzene <br />10 ppm <br />Toluene <br />100 ppm <br />Xylene <br />100 ppm <br />Ethyl Benzene <br />100 ppm <br />These chemicals are found in varying concentration of gasoline. They are colorless <br />liquids with strong aromatic petroleum hydrocarbon -like odors. They are all <br />flammable and moderately volatile. Their vapors are heavier than air and have low <br />solubility in water. <br />The anticipated levels of these chemicals detected at the facility are considered low <br />enough not to pose a potential threat. <br />D.) Action Levels: <br />