REP33845

• Permit No: M1977208
• IBM Index Class Name: Report
• Doc Date: 9/16/2004
• Doc Name: Wildlife Resource Assessment Rpt
• From: DMG
• To: DOW
• Media Type: D
• Archive: No

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 known added concentration provides an estimate of
the reliability of the analysis and the properties 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 Composition 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 arbonat .c
expressed as COZ loss on ignition}, silicon dioxide, lesser amounts of aluminum,
- sodium, and potassium oxides, and other trace metals. This composition is
reflective of the composition of the natural rock materials (limestone, shale, and
silica) that are used to make cement
.
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-40
(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 8i-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.
I 4.3.2 Composition 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
comparison. The most stringent water quality standards were selected for
comparison. The constituent concentration values shown in bold on Table 4.4
exceed the applicable water quality standard.

The results 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.