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Isotopic Studies of Contaminant Transport at the Hanford Site, Washington

^a Center for Isotope Geochemistry, Earth Sciences Division, E.O. Lawrence Berkeley National Lab., 1 Cyclotron Rd., Berkeley, CA 94720
^b Dep. of Earth and Planetary Science, Univ. of California, Berkeley, CA 94720
^c Pacific Northwest National Lab., Richland, WA 99353

View larger version (58K): [in this window] [in a new window]   FIG. 1. Map of the 87Sr/86Sr of groundwater for the Hanford Site (after Singleton et al., 2006).

View larger version (27K): [in this window] [in a new window]   FIG. 2. Map of the T-TX-TY Waste Management Areas (WMAs) in the 200 West Area, Hanford, WA. Shown are locations of vadose zone boreholes including the studied borehole cores C4104 and C3832. Locations of groundwater sampling wells, and the location of the multilevel well W11-25B are also shown. For brevity, the 299 prefix has been dropped from well names. Contours of 99Tc groundwater concentration are from Hartman et al. (2006).

View larger version (18K): [in this window] [in a new window]   FIG. 3. Profiles for the (A) C3832 cores and (B) C4104 cores of Uranium concentration and 236U/238U. Uranium concentrations are from Serne et al. (2004a, 2004b).

View larger version (29K): [in this window] [in a new window]   FIG. 4. Plots of uranium isotopic data. (A) 236U/238U vs. 235U/238U; (B) 236U/238U vs. 234U/238U. Black circles are data for pore water extracts from C4104 (Waste Management Area [WMA] T); pink squares are data for pore water extracts from C3832 (WMA TX). Errors for data are approximately the size of the symbols or smaller. Red triangles represent estimates by Jones et al. (2000) of the U isotopic compositions of suspected or known tank leaks in WMA T-TX-TY. The blue square and green diamond represent the U isotopic compositions of the BX102 and B110 tank leaks established by Christensen et al. (2004). In A, data for a 1999 sample of W10-24 is from Dresel et al. (2002). Inset in B at expanded scale shows the best-fit line through the top four samples and its relationship to model compositions for processed enriched U fuels from Watrous and Wootan (1997). Numbers along best-fit line represent percentage of processed enriched fuel in the mixture.

View larger version (21K): [in this window] [in a new window]   FIG. 5. Profile through core C4104 of the pore water concentrations of Sr (µg L–1), nitrate (mg L–1), U (µg L–1), and 99Tc (nCi L–1). Data from Serne et al. (2004b).

View larger version (22K): [in this window] [in a new window]   FIG. 6. (A) Map of groundwater 87Sr/86Sr in WMA T-TX-TY and vicinity. Data from Table 1 and Singleton et al. (2006). (B) Profile below water table in W11-25B (see Fig. 2 for location) of 87Sr/86Sr.

View larger version (26K): [in this window] [in a new window]   FIG. 7. Plot of 15N versus 18O for nitrate in groundwater samples from Waste Management Area (WMA) T and for the sub-water table depth discrete samples from W11-25B. Additional data, the field for background cores, and data for tank-related waste from contaminated cores are from Singleton et al. (2005). The field for synthetic nitrate (representing low-activity waste) is from Kendall (1998) and Amberger and Schmidt (1987). Lines connect samples from the same well taken at different times, with the more recent sample indicated by a white dot.

View larger version (11K): [in this window] [in a new window]   FIG. 8. Plot of 236U/238U versus pH for core C4104 in WMA T. Data for pH from Serne et al. (2004b).

View larger version (34K): [in this window] [in a new window]   FIG. 9. Plot of depth below ground surface vs. 87Sr/86Sr comparing vadose zone pore waters from the contaminated cores C4104 (black circles) and C3832 (red squares) with vadose zone pore water from an uncontaminated core (blue diamonds, W22-48 Maher et al. 2003). Green stars represent bulk sediment analyses for W22-48 (Maher et al. 2003). Dashed lines connect corresponding stratigraphic depths for the cores. Peach shaded and purple shaded areas represent zones of U and 99Tc contamination.