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W-Val <br /> INC <br /> • 3 0 ENVIRONMENTAL STANDARDS AND IMPACTS <br /> 3.1 Environmental Standards <br /> As part of this site assessment investigation, WZI reviewed existing environmental <br /> standards regarding gasoline fuel Regulations concerned with acceptable levels of <br /> gasoline fuel concentrations in soil and drinking water have been established by USEPA <br /> and the California Environmental Protection Agency (Cal EPA) USEPA has established <br /> a Maximum Contaminant Level for the benzene component of gasoline fuel in drinking <br /> water at concentrations of 5 microgram per liter Cal EPA has established a Maximum <br /> Contaminant Level for benzene in drinking water at 1 microgram per liter <br /> i <br /> 32 Characteristics of Gasoline Fuel <br /> • Gasoline is a mixture of over 200 petroleum derived chemicals plus a few synthetic <br /> products that are added to improve fuel performance The majority of gasoline <br /> components range from C4 to C12 hydrocarbons Analysis of gasoline components is <br /> usually limited to detection of benzene, toluene, ethyl benzene and xylene (BTEX) <br /> because (1) they are readily adaptable to gas chromatographic detection, (2) they pose <br /> or probably pose a serious threat to human health, (3) they have the potential to move <br /> I � <br /> through soil and contaminate groundwater, and (4) their vapors are highly flammable and <br /> explosive <br /> Acute toxicity from gasoline includes anesthetic effects and mucus membrane irritation <br /> Symptoms of acute exposure indicate headache, blurred vision, dizziness, and nausea <br /> The mayor toxicity concern is due to benzene Benzene is a known human carcinogen <br /> through inhalation Gasoline typically contains 0 7 to 1 0 percent benzene The U S <br /> Occupational Health and Safety Administration (OSHA) TWA for benzene is currently 10 <br /> mglkg, however, it has been proposed at 1 mg/kg, primarily due to the association between <br /> 08220010 011 21 <br />