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Monitor Chromium in the Ground at the 100-D Area of the Hanford Reservation
Problem Statement and Objectives
In recent years, the In Situ Redox Manipulation (ISRM) Barrier, in the 100-D Area at the Department Of Energy Hanford Reservation, has been showing signs of losing its reductive capacity -- several of the 66 wells that make up this reactive barrier have lost their ability to chemically reduce chromium and thus remove it as a threat to the Columbia River ecosystem.
Needed was the ability to spatially elucidate the distribution of chromium in the aquifer in order to pinpoint the areas of breakdown in the reactive barrier.
ARA took on the major tasks in this project, including:
- gathering of surface self-potential geophysical data
- complex resistivity measurement
- enhance vertical resolution of data
Results and Benefits
Collected data on and around the ISRM barrier in the northwest part of 100-D, with the support of Fluor Hanford when needed. Processed and evaluated the data, providing a summary report to Fluor Hanford.
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The top portion of the figure shows the ISRM barrier. The geophysical measurements will provide 2-D images that correlate to the contamination concentration.
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