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• <br /> INITIAL RELEASE DDJC Tracy <br /> APPENDIX A: Glossary <br /> Comparison Values <br /> Estimated contaminant concentrations in specific media that are not likely to cause adverse <br /> health effects, given a standard daily ingestion rate and standard body weight. The comparison <br /> values are calculated from the scientific literature available on exposure and health effects. <br /> Concentration <br /> The amount of one substance dissolved or contained in a given amount of another. For <br /> example, sea water contains a higher concentration of salt than fresh water. <br /> Contaminant <br /> Any substance or material that enters a system (e.g., the environment, human body, food) <br /> where it is not normally found. <br /> Dermal <br /> Referring to the skin. Dermal absorption means absorption through skin. <br /> Environmental contamination <br /> The presence of hazardous substances in the environment. From a public health perspective, <br /> environmental contamination is addressed when it potentially affects the health and quality of life <br /> of people living and working near the contamination. <br /> Exposure <br /> Contact with a chemical by swallowing, by breathing, or by direct contact (such as through <br /> the skin or eyes). Exposure may be short term (acute) or long term (chronic). <br /> Ingestion <br /> Swallowing (such as eating or drinking). Chemicals can get in or on food, drink, utensils, <br /> cigarettes, or hands where they can be ingested. After ingestion, chemicals can be absorbed into <br /> the blood and distributed throughout the body. <br /> Media <br /> Soil, water, air, plants, animals, or any other parts of the environment that can contain <br /> contaminants. <br /> A-I <br />