1999-06-23_REVISION - M1977208 - Laserfiche WebLink

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' the results. Matrix spike samples were analyzed to determine sample matrix characteristics. Spike analyses Consist of adding a known amount of each ' analyte to a sample and determining the percent recovery. The concentration of each analyte relative to the kno dried concentration provides an estimate of the reliability of the analysis and operties of the sample matrix. Laboratory ~ certified standards were also used to verify the accuracy of the analytical results. 4.3 Analytical Results 4.3.1 Comaosition of the CKD ' Table 4.3 summarizes the results of the whole rock CKD analysis. The laboratory results data package is included in Appendix A. The results of the analysis indicate that the CKD is primarily composed of calcium oxides and carbonates ' (expressed as COZ loss on ignition), silicon dioxide, lesser amounts of aluminum, , L' sodium, and potassium oxides, and other trace metals. This composition is ~ + ` r~~ reflective of the composition of the natural rock materials (limestone, shale, and ' ~ ~ ~'' oY' " t '~ ' silica) that are used to make cement. Ir} The CKD also contains small quantities of natural radionuclides that are the ' source of gross alpha and gross beta activities. The activities determined for the radionuclides are within the range of activities usually found in native rocks and soils in the area. The results of a CKD analysis conducted by the EPA in 1992 ' indicates that the predominant natural radionuclide in the CKD is potassium~0 (K-40). Less quantities of other natural radionuclides also occur. These include bismuth-214 (Bi-214), lead-214 (Pb-214), radium-226 (Ra-226), radium-228 (Ra- 228), thorium-230 (Th-230), uranium-234 (U-234), and uranium-238 (U-238). K- 40, Ra-228, and Bi-214 are the most likely sources of the gross beta activity. The ~ other radionuclides are primarily alpha-emitters which is the source of the gross ' alpha activity. 4.3.2 Comaosition of the Leachate The concentration of leachable constituents determined for the CKD and other ' solid materials are summarized in Table 4.4. The laboratory results data package is included in Appendix A. Colorado primary and secondary drinking water standards and agricultural water standards are included in the table for ~ ~p ' comparison. The most stringent water quality standards were selected for ~ Gam'" ~ comparison. The constituent concentration values shown in bold on Table 4.4 ~ ~,,~ 0 k- exceed the applicable water quality standard. ' The resul#s of the CKD leachate analyses indicate that the primary leachable constituents are calcium, sodium, potassium, strontium, barium, sulfate, chloride, ' and fluoride. Trace quantities of chromium, lithium, molybdenum, silicon, zinc, arsenic, selenium, thallium, and phosphate were also detected. The CKD also contains leachable trace natural radionuclides (discussed above in Section 4.3.1) that are the source of the gross alpha and beta activities of the leachate.