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Definitions (200)
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Confining Layer
A layer or bed of impermeable or distinctly less permeable material lying below or above one or more aquifers. When the confining layer lies between two aquifers, it keeps water from the upper aquifer [..]
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Void space
The space in a tank between the top of a tank and the liquid level. If the tank is used to store combustible liquids that easily evaporate, this space can fill with vapors which may reach explosive le [..]
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Acceptable intake
Numbers which describe how toxic a chemical is. The numbers are derived from animal studies of the relationship between dose and non-cancer effects. There are two types of acceptable exposure values: [..]
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acids
A class of compounds that can be corrosive when concentrated. Weak acids, such as vinegar and citric acid, are common in foods. Strong acids, such as muriatic (or hydrochloric), sulfuric and nitric ac [..]
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action level
A guideline established by environmental protection agencies to identify the concentration of a substance in a particular medium (water, soil, etc.) that may present a health risk when exceeded. If co [..]
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Activated sludge
A term used to describe sludge that contains microorganisms that break down organic contaminants (e.g., benzene) in liquid waste streams to simpler substances such as water and carbon dioxide. It is a [..]
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Adverse health effects
Effects of chemicals or other materials that impair one's health. They can range from relatively mild temporary conditions such as minor eye or throat irritation, shortness of breath or headaches [..]
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Advisory level
The level above which an environmental protection agency suggests it is potentially harmful to be exposed to a contaminant, although no action is mandated.
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Aeration
Passing air through a solid or liquid, often part of a process that promotes breakdown or movement of contaminants in soil or water by exposing them to air.
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Air Sparging
Injecting air or oxygen into an aquifer to strip or flush volatile contaminants as air bubbles up through the ground water. The air is captured by a vapor extraction system. (See soil vapor extraction [..]
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