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constituents are available to migrate through soils to ground or surface waters. In cases where a waste may only threaten ground water, filtered samples should be subjected to analysis. Oote: Caution should be exercised in the decision to filter samples for analysis Increased exposure of a sample to air that may occur during the filtration process can increase the dissolution of carbon dioxide and result in changes of chemical equilibria that, in turn, can alter the F solubilities of many constituents. Erroneous analytical data may be the final result. If overland flow to surface waters is possible, the total constituent concentrations may be ,- available for movement and analyses should be conducted on unfiltered samples. r 3.1.2 Solid Wastes Since it is the soluble fraction of a constituent of a solid waste which actually has the potential to migrate to waters of the State, the extractable concentration is a more accurate measure(than the total concentration) of the ability of a particular solid waste constituent to degrade water quality. Therefore,it is recommended that whenever possible,extractable concentrations be determined for use in classifying solid wastes for purposes of water quality protection. Determining Extractable Concentrations For consistency with the hazardous waste identification procedures in Title 22 of CCR, etractable waste constituent concentrations should be determined using the Waste xtraction Test(WET)procedure from§66700 of those regulations,as indicated in Figures 8 and 9. The full WET procedure is contained in Appendix I to this report. In many cases, waste generators or dischargers must perform this test on their wastes to comply with the hazardous waste identification regulations of Title 22 of CCR, Division 4,Chapter 30, Article 11. Thus,much of the data needed to determine whether the waste is a 'designated waste' will be generated by that process. Further Justification for use of the WET over other extraction procedures is presented in the CAM SOR 3 Note. Users are cautioned to ignore the phrase in part (b)of the WET procedure which permits the elimination of analyses for constituents whose total concentrations in the waste fall below hazardous STLC criteria(see Appendix I below). This exemption was developed for determinations of whether a waste is 'hazardous' under Title 22 of CCR. The determination of whether a waste is 'designated' under Subchapter 15 often involves more stringent criteria _ and these eliminated analytical results may be critical to this determination. As shown in Figure 9,the WET requires a 10-fold dilution (wt./vol.) of waste into the extract solution. The results of the extraction in terms of milligrams of soluble constituent per liter of extract solution(mg/1) is,therefore,equal to one tenth (1/10) of the concentration expressed in milligrams of soluble constituent per kilogram of solid waste. This fact will be used in the calculation of Designated Levels in Section 3.3.3 of this report. 0 Page 20 Designated Level Methodology