Investigation of Hexavalent Chromium Flux to Groundwater at the 100-C-7:1 Excavation Site

Truex, Michael J.; Vermeul, Vincent R.; Fritz, Brad G.; Mackley, Rob D.; Horner, Jacob A.; Johnson, Christian D.; Newcomer, Darrell R.

doi:10.2172/1063737

Cited by 1 publication

(1 citation statement)

References 14 publications

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“…Zone-Applied Field Research Initiative (DVZ-AFRI) are developing and implementing the tools and scientific approaches to conduct mass fluxbased assessments (Truex et al 2009(Truex et al , 2012a(Truex et al , 2012bCarroll et al 2012Carroll et al , 2013Brusseau et al 2010;Johnson et al 2013). Mass flux-based assessments improve our understanding of subsurface contaminant transport by describing contaminant behavior and by relating that transport to actual exposure pathways .…”

Section: Current Efforts Within the Doe Office Of Environmental Managmentioning

confidence: 99%

Risks from Past, Current, and Potential Hanford Single Shell Tank Leaks

Triplett

Watson

Wellman

2013

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ph: (865) 576-8401 fax: (865) 576-5728 email: reports@adonis.osti.gov Available to the public from the National Technical Information Service, U.S. Department of Commerce, 5285 Port Royal Rd., Springfield, VA 22161 ph: (800) 553-6847 fax: (703) 605-6900 email: orders@ntis.fedworld.gov online ordering: http://www.ntis.gov/ordering.htmThis document was printed on recycled paper. SummaryDue to significant delays in constructing and operating the Waste Treatment Plant, which is needed to support retrieval of waste from Hanford's single shell tanks (SSTs), SSTs may now be required to store tank waste for two to three more decades into the future. Many SSTs were built almost 70 years ago and all SSTs have greatly exceeded their design lives. Recent examination of monitoring data suggests several of the tanks that were interim stabilized a decade or more ago may be experiencing small leaks (perhaps 150-300 gallons per year) to the subsurface environment. A potential leak from tank T-111 is estimated to have released approximately 2,000 gallons into the subsurface. Observations of past leak events, recently published simulation results, and new simulations all suggest that recent leak events are not likely to impact underlying groundwater above regulatory limits. However, these recent observations remind us that much larger source terms are still contained in the tanks and are also present in the vadose zone from historical intentional and unintentional releases. Recently, significant improvements have been made in methods for detecting and characterizing soil moisture and contaminant releases, understanding and controlling mass-flux, and remediating deep vadose zone and groundwater plumes. To ensure extended safe storage of tank waste in SSTs, the following actions are recommended:1. Improve capabilities for intrusion and leak detection. Develop defensible conceptual models of intrusion and leak mechanisms.3. Apply enhanced subsurface characterization methods to improve detection and quantification of moisture changes beneath tanks.4. Maintain a flux-based assessment of past, present, and potential tank leaks to assess risks and to maintain priorities for applying mitigation actions.5. Implement and maintain effective mitigation and remediation actions to protect groundwater resources.These actions will enable limited resources to be applied to the most beneficial actions. A systems-based approach will support extended safe storage of tank waste, reduce the risks from tank leaks, and protect human health and the environment.

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