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0 • <br /> 4.0 HAZARD EVALUATION <br /> 4.1 CHEMICAL HAZARDS <br /> As discussed, the objective of this investigation is to collect soil and <br /> ground water samples to evaluate baseline conditions at the property. <br /> Based on site operations, the potential exists for the constituents discussed <br /> below to be present in site soil and ground water. <br /> Dust generating activities will not be performed, and therefore,respirable <br /> dust monitoring will not be performed. <br /> 4.1.1 Petroleum Hydrocarbons <br /> Most organic compounds, except those known to be carcinogenic, exhibit <br /> similar hazard effects in humans. Effects on the central nervous and <br /> upper respiratory systems as well as skin irritation predominate. <br /> Therefore, although a summary of the hazards of the identified <br /> hydrocarbons are listed separately below, additive effects of the mixture <br /> will be taken into consideration when determining established action <br /> levels. <br /> 4.1.1.1 Diesel <br /> Diesel is a mix of hydrocarbons, chiefly of the methane series having 10 to <br /> 16 carbon atoms per molecule. It is a severe skin irritant with systemic <br /> effects by ingestion. It is combustible when exposed to heat or flame and <br /> can react with oxidizing materials. The vapor is also moderately explosive <br /> when exposed to heat or flame. <br /> 4.1.1.3 Gasoline <br /> Gasoline varies in composition but in general consists of hexanes, <br /> heptanes, octanes, and aromatic hydrocarbons. Exposure to gasoline and <br /> other petroleum hydrocarbons can produce narcotic effects such as <br /> dizziness, headaches, and giddiness similar to alcohol intoxication. <br /> Gasoline is also an irritant to the mucous membranes and can irritate the <br /> eyes, throat, and skin. The Cal/OSHA personal exposure limit (PEL) for <br /> gasoline is 300 ppm (parts per million). The short-term exposure limit <br /> (STEL), which pertains to an exposure for 15 minutes, is 500 ppm. Most <br /> people can detect gasoline vapor in concentrations as low as 50 ppm via <br /> their sense of smell. Exposed skin should be washed promptly with soap <br /> and water, and eyes should be flushed immediately with eyewash <br /> 5164.00-3/4/03 <br /> ERM <br /> HASP CANON 7 <br />