Groundwater Remediation
In addition to the groundwater and surface water monitoring programs described above, DuPont has conducted numerous groundwater investigations that helped guide the selection of remediation alternatives to improve groundwater quality. The most recent phase of groundwater remediation was completed in 2005, when DuPont installed a 485-foot-long, 117-foot-deep, underground Permeable Reactive Barrier, or PRB, to destroy carbon tetrachloride contaminants in groundwater. The first 110-foot segment of the PRB was installed in 2001 as a proof-of-concept experiment, or pilot test. A three-year monitoring program demonstrated the effectiveness of this pilot PRB, and DTSC authorized DuPont to complete construction of the full-scale PRB system in 2005.
Over the next several years DuPont will monitor the PRB to verify its performance, with results reported every six months to DTSC. In addition, based on the analysis of all data from the comprehensive, sitewide groundwater monitoring program, DuPont will propose other groundwater remedies in areas that are not currently addressed by the PRB.
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Other pages in this section:
- Highlights
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The February 2005 Fact Sheet published by the Department of Toxic Substances Control describes how the permeable reactive barrier (PRB) works.
