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Impact Assessment of Existing Vadose Zone Contamination at the Hanford Site SX Tank Farm

^a Fluor Government Group, P.O. Box 1050, Richland, WA 99352
^b Pacific Northwest National Lab., P.O. Box 999, Richland, WA 99352
^c Fluor Hanford, Inc., P.O. Box 1000, Richland, WA 99352
^d CH2M HILL Hanford Group, Inc., P.O. Box 1500, Richland, WA 99352

View larger version (31K): [in this window] [in a new window]   FIG. 1. Location map of single-shell tank Waste Management Area (WMA) S-SX and surrounding facilities in the 200 West Area, Hanford Site, Washington State.

View larger version (134K): [in this window] [in a new window]   FIG. 2. 241-SX tank farm under construction.

View larger version (22K): [in this window] [in a new window]   FIG. 3. Geologic cross-section through tank row SX-107, SX-108, and SX-109. Depths and distances are shown in feet (ft) because of its usage at the Hanford Site. (bgs, below ground surface.)

View larger version (58K): [in this window] [in a new window]   FIG. 4. Technetium-99/(nitrate + nitrite) ratios for Waste Management Area (WMA) S-SX network wells (the ratios highlighted in green and red). The technetium-99/(nitrate + nitrite) ratios for tanks SX-108 and SX-115 are 0.43 and 0.42 pCi µg–1, respectively. All well numbers are prefixed by 299-. RCRA = Resource Conservation and Recovery Act.

View larger version (56K): [in this window] [in a new window]   FIG. 5. Vadose zone contamination for cesium-137, technetium-99, and sodium near tank SX-108 (after Serne et al., 2001a). A composite sample is obtained by combining two adjacent sleeves of the borehole liner. Depths are shown in feet (ft) because of its usage at the Hanford Site.

View larger version (42K): [in this window] [in a new window]   FIG. 6. Progression of saturation profile at year (a) 2000, (b) 2050, (c) 2540, and (d) 3000. Depths and distances are shown in feet (ft) because of its usage at the Hanford Site. (bgs, below ground surface.)

View larger version (44K): [in this window] [in a new window]   FIG. 7. Progression of technetium-99 distribution at year (a) 2000, (b) 2050, (c) 2540, and (d) 3000. Depths and distances are shown in feet (ft) because of its usage at the Hanford Site. (bgs, below ground surface.)

View larger version (15K): [in this window] [in a new window]   FIG. 8. Simulated flux versus time at the water table for the base case with no interim barrier.

View larger version (20K): [in this window] [in a new window]   FIG. 9. Simulated breakthrough curve for technetium-99 at the tank farm fenceline for the base case with no interim barrier.

View larger version (15K): [in this window] [in a new window]   FIG. 10. Simulated flux versus time at the water table for the interim barrier case.

View larger version (19K): [in this window] [in a new window]   FIG. 11. Simulated breakthrough curve for technetium-99 at the tank farm fenceline for the interim barrier case.

View larger version (24K): [in this window] [in a new window]   FIG. 12. Simulated breakthrough curves for technetium-99 at the tank farm fenceline for various recharge estimates.