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Pore Water—water contained in voids in the solid material. <br /> Porosity—the ratio of the aggregate volume of voids or Interstices to the total volume of the medium. <br /> Portland Cement—a hydraulic cement produced by pulverizing clinker consisting essentially of <br /> hydraulic calcium silicates, usually containing one or more of the forms of calcium sulfate. <br /> Potentially Responsible Party (PRP) —potentially liable for the contamination and cleanup of CERCLA <br /> sites. <br /> Poaolan—a siliceous or siliceous and aluminous material, which in Itself possesses little or no <br /> cementitious value but will, in finely divided form and in the presence of moisture, chemically react with <br /> calcium hydroxide at ordinary temperatures to form compounds with cementitious properties. The term <br /> Is derived from an early source of natural pozzolanic material, Pozzuoli, Italy. <br /> Proposed Plan—Superfund public participation fact sheet that summarizes the preferred cleanup <br /> strategy, the rationale, and the RI/FS. <br /> Proven (or Established) Technologies—technologies that have been used on a commercial scale and <br /> established for use In full-scale remediation (e.g., on-slte or off-site incineration, capping, S/S. <br /> Pyrometallurgical Separation— methods using high-temperature processes to treat a metal- <br /> contaminated solid for recovery of metals as metal, metal oxide, ceramic product, or other useful form. <br /> RCRA Characteristic Waste—any solid waste exhibiting a characteristic of ignitability, corrosivity, <br /> reactivity or toxicity, as defined in 40 CFR 261, Subpart C. <br /> RCRA Hazardous Waste—any RCRA solid waste, as defined by 40 CFR 261.3, that is not excluded <br /> from regulation under 40 CFR 261.4 and that meets any one of the characteristic or listing criteria <br /> (including matures) described in 40 CFR 261.3(a)(2). <br /> RCRA-Listed Waste—any solid waste listed in 40 CFR 261, Subpart D; or a mixture that contains a <br /> solid waste listed in 40 CFR 261, Subpart D that has not been excluded under the provisions of 40 CFR <br /> 261.3 in accordance with 40 CFR 260.20 or 40 CFR 260.22. <br /> RCRA Solid Waste—any garbage, refuse, or sludge; or any solid, liquid, semi-solid or contained <br /> gaseous material that is: (1) discarded, (2) no longer to be used for its original purpose, or (3) a <br /> manufacturing or mining by-product and is not excluded by the provisions of 40 CFR 261.4(a). For <br /> more detail, see 40 CFR 260, Appendix I. Also note that the definition of solid waste includes materials <br /> s <br /> that are not 'solids' in the normal sense of the word. <br /> t <br /> Reactivity Characteristic—exhibiting the hazardous characteristic of reactivity as defined in 40 CFR <br /> 261.23. <br /> a Record of Decision (ROD) —a document prepared to explain and define the final remedy selected for a <br /> CERCLA site (40 CFR 300.430 (f)(4)(i)). <br /> Redox—abbreviation for oxidation-reduction, now accepted as a word. <br /> Reduction of Toxicity, Mobility, and Volume—the three principal measures of the overall performance <br /> of a remediation option. The 1986 amendments to the Superfund statute emphasize that, whenever <br /> possible, the EPA should select a remedy that uses a treatment process to permanently reduce the level <br /> of toxicity of contaminants at the site, the spread of contaminants away from the source, and the volume <br /> K-11 <br />