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Human Health Risk Assessment <br /> Former Mobil Oil Bulk Plant 04-343 <br /> 540 East Grant Line Road <br /> Tracy, California <br /> AGENICITY: The ability of an agent or substance to cause heritable defects. <br /> l <br /> HROTOWITY: The ability of an agent or substance to cause damage to the kidney. <br />#jEUROTO)UCITY: The ability of an agent or substance to damage or destroy nerve tissue. <br />,dFO OBSERVED ADVERSE EFFECT LEVEL (NOAEL): The lowest exposure level at which there are no statistically or <br /> ologically significant increases in the frequency or severity of adverse effects between the exposed population and its appropriate control group. <br /> O OBSERVED EFFECT LEVEL (NOEL): An exposure level at which there are no statistically or biologically significant increases <br /> the frequency or severity of any effect between the exposed population and its appropriate control group. <br /> jjECEPTOR: A macromolecule with which a drug interacts to produce its characteristic effect. A receptor may also be an individual who may <br /> exposed to chemicals in an environmental matrix. <br /> lERENCE CONCENTRATION (RfC): The RfC is an estimate of the concentration of a chemical in air (in mg/m3) to which a <br /> an population (including sensitive subgroups) may be exposed without the occurrence of deleterious effects during a portion of their lifetime. <br /> EFERENCE DOSE (RfD): The pathway-specific value which represents the daily human exposure to a toxicant that is likely to be without <br /> pSKi� <br /> idence of adverse health effects. <br /> CHARACTERIZATION: The process of obtaining a quantitative estimate of risk by utilizing parameters associated with a particular <br /> inant and site, i.e., toxicity and exposure. <br /> RESHOLD: The level of exposure below which no effect occurs. <br /> MCANT: A substance that may be dangerous to life or health. Often condsidered to be a substance with relatively high acute toxicity; <br /> tg� <br /> lly defined as having an acute oral toxicity of less than 50 milligrams per kilogram of body weight. <br /> PER-BOUND LIMIT: The statistically defined maximum end of a range of possible outcomes. With respect to incremental cancer risk, <br /> U, <br /> limit generally refers to the 45% confidence interval of potential risk. <br /> 30-Q136-11 <br />