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Fate of Brine Applied to Unpaved Roads at a Radioactive Waste Subsurface Disposal Area

Idaho National Engineering and Environmental Laboratory, P.O. Box 1625, Idaho Falls, ID 83415-2107

View larger version (23K): [in a new window]   Fig. 1. Map showing the location of the INEEL in southeastern Idaho and the location of the radioactive waste Subsurface Disposal Area.

View larger version (32K): [in a new window]   Fig. 2. Cross section trending west to east through the Subsurface Disposal Area.

View larger version (45K): [in a new window]   Fig. 3. Map of the Subsurface Disposal Area showing the distribution of ponded water from snowmelt in the spring of 1995. Locations of neutron access tubes (NAT) used to measure moisture infiltration are also shown.

View larger version (47K): [in a new window]   Fig. 4. Locations of wells with suction lysimeters at the Subsurface Disposal Area. Roads where brine was applied are indicated with dashed lines.

View larger version (44K): [in a new window]   Fig. 5. Map of the Subsurface Disposal Area showing the locations of wells where sediments were collected for analysis of soluble ions. Roads where brine was applied are indicated with dashed lines.

View larger version (22K): [in a new window]   Fig. 6. Correlation of Cl– concentration to Br– concentration for water samples from the surficial alluvium (circles) and B–C interbed (squares).

View larger version (24K): [in a new window]   Fig. 7. Change in Cl/Br mass ratio, with changes in total Cl– concentration for lysimeter samples at the Subsurface Disposal Area. Solid line represents mixing of brine with natural recharge, dashed line represents mixing of 10 mg L–1 Br– solution in silica flour with natural recharge, and dash–dot line represents mixing of brine with 10 mg L–1 Br– solution.

View larger version (47K): [in a new window]   Fig. 8. Map of the Subsurface Disposal Area showing the distribution of uncontaminated wells and wells contaminated by MgCl2 brine relative to the locations of roads where brine was applied. This map includes wells at all depths under the Subsurface Disposal Area.

View larger version (25K): [in a new window]   Fig. 9. Time series plot of Cl– concentrations at the west end of the Subsurface Disposal Area in Wells W23 and 98-5.

View larger version (27K): [in a new window]   Fig. 10. Time series plot of Cl– concentrations from lysimeters in Wells D06 and TW1.

View larger version (26K): [in a new window]   Fig. 11. Time series plot of Cl/Br mass ratios from lysimeters in Wells D06 and TW1.

View larger version (15K): [in a new window]   Fig. 12. Plot of soluble Cl– and soluble Br– in Subsurface Disposal Area surficial sediments.

View larger version (25K): [in a new window]   Fig. 13. Distribution of extractable Cl– with depth along the main east–west road through the Subsurface Disposal Area. The scale of the graphs varies from 0 to 20 to 0 to 200 mg kg–1. Gray areas show the depth of the borehole.

View larger version (25K): [in a new window]   Fig. 14. Distribution of extractable Cl– with depth from the central portion of the Subsurface Disposal Area. The scale of the graphs ranges from 0 to 200 to 0 to 2000 mg kg–1. Gray area shows the depth of the borehole.

View larger version (24K): [in a new window]   Fig. 15. Distribution of extractable Cl– with depth along the southern boundary of the Subsurface Disposal Area. Gray area shows the depth of the borehole.