Immobilized low-activity waste site borehole 299-E17-21

Radionuclide Distribution Coefficients of Sediments Collected from Borehole 299-E17-21: Final Report for Subtask 1a

“…Table 8 provides the conservative and best estimates of & values, assuming that the Hanford formation will be treated as a single modeling unit. Which of these two tables, or more specifically, which of these two conceptual models, that will ultimately be used in the performance assessment will depend on these data as well as the characterization data generated by Reidel et al (1998) and the Fayer et al letter report, as well as future calculations to be conducted in fiscal year 1999. Presumably, if significant differences in other parameter values such as hydraulic conductivity are observed between the layers, then it may be decided that introducing the added complexity of three layers may be warranted.…”

“…A log of the borehole was presented in Reidel et al (1998). Selected cores from this borehole were transferred to M. J. Fayer, Pacific Northwest National Laboratory, who is making, concurrent with this study, a number of hydrologic and physical measurements of the same sediments.…”

“…To test this hypothesis, the & values of several radionuclides were measured using 20 subsamples from borehole 299-E17-21 (Reidel et al 1998).…”

“…This report describes geochemical characterization and radionuclide & measurements made using the first borehole sediments collected from the ILAW-DC (borehole 299-E17-21). The characterization plan for this borehole was presented in Reidel et al (1998). These sediments were characterized for physical and hydrologic properties by researchers at Pacific Northwest National Laboratory?…”

Revised Hydrogeology for the Suprabasalt Aquifer System, 200-East Area and Vicinity, Hanford Site, Washington

“…The first well on the south end of the section is a new well, 299-E17-21, drilled for the Immobilized Low-Activity Waste Site (ILAW) in 1998 (Reidel et al 1998). The geophysical log and geologic data illustrate the Unit 8 type curve (note overall thickness) and hydrostratigraphic continuity to well 299-E17-6.…”