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APPENDD( K <br /> GLOSSARY <br /> a <br /> Abrasives— powdered, granular, or solid materials used to grind, smooth, cut, or polish other <br /> substances. <br /> Absorption—assimilation of fluids into interstices. <br /> I <br /> Acidity—the quantitative capacity of materials to react with hydroxyl ions. <br /> Active Biomass—living plants, animals, or microorganisms. <br /> Additives— materials included in the binder to improve the S/S process. Examples of some types of <br /> additives are (1) silicates or other materials that alter the rate of hardening, (2) clays or other sorbents to <br /> improve retention of water or contaminants, or (3) emulsifiers and surfactants that improve the <br /> incorporation of organic compounds. <br /> Administrative Record - material documenting EPA's selection of cleanup remedies at Superfund sites, <br /> usually placed in the information repository near the site. <br /> Adsorption-attraction of solid, liquid, or gas molecules, ions, or atoms to particle surfaces by <br /> physicochemical forces. The adsorbed material may have different properties from those of the material <br /> in the pore space at the same temperature and pressure due to altered molecular arrangements. <br /> Advection- unidirectional, progressive bulk movement, such as water under the influence of a hydraulic <br /> gradient. <br /> Alkalinity-the quantitative capacity of aqueous media to react with hydrogen ions. <br /> Amalgamation- in general, the formation of a solid solution of two dissimilar metals. As used in <br /> mineral processing, a method for recovering metals from solids or sludges by treatment with mercury to <br /> form a metal/mercury alloy. <br /> Anion -an ion that is negatively charged. <br /> Applicable or Relevant and Appropriate Requirements (ARARs) -Cleanup standards, standards of <br /> € control, and other substantive requirements, criteria, or limitations promulgated under Federal, State, or <br /> local environmental laws or facility siting laws that are applicable, that specifically address a hazardous <br /> substance, pollutant, contaminant, remedial action, location, or other circumstance found at CERCLA <br /> sites, or are relevant and appropriate, that address problems or situations similar to those encountered <br /> i at CERCLA sites (40 CFR 300.5, pp. 7 and 12). <br /> Aquifer—underground formation of sand, soil, rock, or gravel that can store and supply groundwater to <br /> wells or springs. <br /> Asphalt—a brown, black, hard, brittle, or plastic bituminous material composed principally of <br /> hydrocarbons. It is found in nature or can be prepared by pyrolysis of coal tar, certain petroleums, and <br /> lignite tar. It melts on heating and is insoluble in water but soluble in gasoline. <br /> Bartles-Mozley Table—a multideck gravity concentration shaker table using an orbital motion rather <br /> than pure horizontal motion to develop shear in the layer of particles on the table. <br /> K-1 <br />