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t <br /> j <br /> j <br /> Freeze/Thaw Cycle-alternation of a sample temperature to allow determination of weight loss and <br /> Visual observation of sample disintegration resulting from phase change from water to ice. <br /> Froth Flotation-involves more chemistry than the other physical separation techniques and is based <br /> on the fact that different minerals have different surface properties. These differences in surface <br /> properties can be accentuated by adding suitable chemicals to a slurry containing the minerals. Air is <br /> sparged from the bottom of a tank or column containing the slurry. The desired metal selectively <br /> attaches to the air bubbles and rises to the top, and the froth that forms at the top is collected to <br /> recover the metal i? <br /> Fumes -fine particulates that evaporate and recondense to form the fume. <br /> Geomembrane Curtains-vertical barriers used in applications where chemical degradation of <br /> conventional grouts is anticipated. Geomembranes can be useful as liners in lagoons and landfills where t <br /> contaminant levels in the leachate may be high. <br /> Gravity Concentration-a physical separation technique based on <br /> q particle density. <br /> Groundwater-water found beneath the earth's surface that fills the pores between materials such as <br /> sand, soil, or gravel. <br /> b <br /> Grout- as used in soil and rock grouting, a material injected into a soil or rock formation to change the <br /> physical characteristics of the formation. The term 'grout' is not used in this document but Is frequently <br /> encountered in the S/S industry as a synonym for the term 'binder.' <br /> Grout Curtains-containment barriers formed by grout injection. . <br /> t <br /> Hazardous Characteristics-ignitable, corrosive, reactive, and toxic as defined in 40 CFR Part 261.10. <br /> Hazard Ranking System (HRS) -the primary mechanism for considering sftes for inclusion on the NPL <br /> Hazardous Substance List (HSL) -a list of designated CERCLA hazardous substances as presented in <br /> 40 CFR 302.4. <br /> Hazardous Waste-see RCRA hazardous waste, CERCLA hazardous substance, and CERCLA <br /> hazardous wastestream. <br /> Heat of Hydration (in S/S reactions) -the heat generated due to the reaction of cementitious or <br /> Pozzolanic materials with water. <br /> Heavy Medium Separation- heavy medium separation Is based on a density separation of particles as <br /> they settle in a liquid (heavier than water) the density of which is between that of the two minerals to be <br /> separated. <br /> Horizontal Barriers-low-permeability structures placed horizontally, typically under the contaminated <br /> volume, to contain the contaminants. <br /> Hydrate-a compound containing structural water. <br /> Hydrocyclone-the hydrocyclone consists of a vertical cone into which the feed (in the form of a slurry) <br /> is introduced tangentially at the top. A vortex is created with a low-pressure zone along the vertical axis <br /> of the cone. Faster settling particles (those having larger size or higher density) are accelerated to the <br /> K-6 r <br />