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Figure 8 <br /> DETERMINING SOLUBLE/EXTRACTABLE CONCENTRATIONS <br /> OF CONSTITUENTS OF WASTES OR SOILS <br /> Extraction ProceduM <br /> Waste Extraction Test (WET) from Title 22, CCR, §66700 with the <br /> f following modifications : <br /> Selecting the Extriggtant <br /> Especially important for metallic constituents. <br /> 1) Are the wastes/soils in a potentially acidic environment ? <br /> 2) Are the wastes/soils capable of generating acid ? <br /> Determine Acid-Base Account <br /> If either answer Is "yes" . . . <br /> extract with the standard Citrate Buffer. <br /> If both answers are "no" . . . <br /> extract with Delonized Water. <br /> May need to adjust to the acidity of local rainfall. <br />—� - Select-Extractlon Vessel <br /> For volatile constituents . . . <br /> 1) perform WET using Zero Headspace Extraction Vessel <br /> -and-procedures outlined In draft of EPA <br /> r "Toxicity Characteristic Leaching Procedure" (TCLP), QI <br /> s <br /> 2) calculate Total Designated Levels for comparison with <br /> __--total-constituent concentrations. <br /> -The Department of Health Services developed the WET procedure for use in determining <br /> whether sufficient amounts of extractable constituents are available to leach to ground <br /> L water,and thereby impact human health, if the waste is discharged to a Class III(sanitary) <br /> landfill. The WET uses a citrate buffer solution with a pH of 5.0 to mimic the extraction <br /> capability of'nonhazardous solid waste' leachate,which is often acidic. Acidic solutions <br /> L are more capable than deionized water or some other neutral solution of extracting metallic <br /> and other constituents from a waste. If the proposed waste management scheme is Co- <br /> Designated Level Methodology Page 21 <br />