Compendium of Data for the Hanford Site (Fiscal Years 2004 to 2008) Applicable to Estimation of Recharge Rates

Nichols, William; Rockhold, Mark; Downs, Janelle L.

doi:10.2172/939044

Cited by 4 publications

(13 citation statements)

References 52 publications

(70 reference statements)

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“…• Presents recharge data collected in FY 2004through FY 2009 This report includes an overview of the parameterization of recharge (Section 2), identification of previously published recharge data (Section 3), presentation of previously published data and new data from FY09 (Section 4), discussion of knowledge gaps (Section 5), and conclusions (Section 6). Portions of this report were taken from Nichols et al (2008) and updated where appropriate.…”

Section: Introductionmentioning

confidence: 99%

Soil Water Balance and Recharge Monitoring at the Hanford Site - FY09 Status Report

Rockhold¹,

Saunders²,

Strickland³

et al. 2009

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Section: Introductionmentioning

confidence: 99%

Soil Water Balance and Recharge Monitoring at the Hanford Site - FY09 Status Report

Rockhold¹,

Saunders²,

Strickland³

et al. 2009

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“…Some of the existing lysimeter tests date back to the FLTF starting date of November 1987, which means the length of record is 22 years. Nichols et al (2008) provided the most recent summary of the data.…”

Section: Field Lysimeter Test Facilitymentioning

confidence: 99%

Technical Basis for Evaluating Surface Barriers to Protect Groundwater From Deep Vadose Zone Contamination

Jm¹,

Vl²,

Al³

et al. 2010

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The U.S. Department of Energy (DOE) and its predecessors released nearly 2 trillion liters (450 billion gallons) of contaminated liquid into the vadose zone at the Hanford Site. Some of the contaminants currently reside in the deeper parts of the vadose zone where they are much less accessible to characterization, monitoring, and typical remediation activities such as removal and disposal. The DOE Richland Operations Office (DOE-RL) prepared a treatability test plan in 2008 to examine remediation options for addressing contaminants in the deep vadose zone; one of the technologies identified was surface barriers (also known as engineered barriers, covers, and caps).Surface barriers have long been used to isolate contaminants from the accessible environment. In the typical configuration, the contaminants are located relatively close to the surface, generally within 15 m, and thus they are close to the base of the surface barrier. The proximity of the surface barrier under these conditions yielded few concerns about the effectiveness of the barrier at depth, particularly for cases in which the contaminants were in a lined facility. At Hanford, however, some unlined sites have contaminants located well below depths of 15 m, which means that the contaminants are increasingly distant from the surface barrier meant to isolate them from the accessible environment. The issue raised about these sites is the degree of effectiveness of a surface barrier in isolating contaminants in the deep vadose zone. Previous studies by Hanford Site and PNNL researchers suggest that surface barriers have the potential to provide a significant degree of isolation of deep vadose zone contaminants. The studies show that the actual degree of isolation is site-specific and depends on many factors, including recharge rates, barrier size, depth of contaminants, geohydrologic properties of the sediments, and the geochemical interactions between the contaminants and the sediments.After the DOE-RL treatability test plan was published, Pacific Northwest National Laboratory was contracted to review the information available to support surface barrier evaluation for the deep vadose zone, identify gaps in the information and outcomes necessary to fill the data gaps, and outline tasks to achieve those outcomes. Full understanding of contaminant behavior in the deep vadose zone is constrained by four key data gaps: limited access; limited data; limited time; and the lack of an accepted predictive capability for determining whether surface barriers can effectively isolate deep vadose zone contaminants. Activities designed to fill these data gaps need to have these outcomes:• common evaluation methodology that provides a clear, consistent, and defensible basis for evaluating groundwater impacts caused by placement of a surface barrier above deep vadose zone contamination• deep vadose zone data that characterize the lithology, the spatial distribution of moisture and contaminants, the physical, chemical, and biological process that affect the mobility of ea...

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“…The time required will depend on the thickness and hydraulic properties of the vadose zone and the deep drainage rate itself. Changes in the deep drainage rate, such as would result from changes in surface vegetative conditions that increase or decrease the evapotranspiration rate, can take many years to be reflected in the recharge rate for a thick vadose zone in arid conditions such as at the Hanford Site and can be an important consideration in characterizing recharge as well (Nichols et al 2008). …”

Section: Definitionmentioning

confidence: 99%

“…The site description material came from a variety of sources, including Rockhold et al (2009), Nichols et al (2008, and Fayer and Keller (2007).…”

Section: Recharge Sites and Monitoring Activities In Fy 2010mentioning

confidence: 99%

“…This section discusses data gaps, project leveraging, and recommendations for existing monitoring sites. Table 5.1 contains a set of previously-identified data gaps related to recharge at the Hanford Site (Rockhold et al 2009;Nichols et al 2008). We reviewed those gaps and identified those that rank higher in importance than the rest.…”

Section: Recharge Strategy For 2011-2015mentioning

confidence: 99%

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Soil Water Balance and Recharge Monitoring at the Hanford Site ? FY 2010 Status Report

Fayer¹,

Saunders²,

Herrington³

et al. 2010

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SummaryThis report summarizes the recharge data collected in FY 2010 at five locations on the Hanford Site in southeastern Washington State. From late fall to early spring of FY 2010, precipitation and temperature conditions did not present an opportunity for increased recharge. The recharge monitoring data confirmed these conditions, showing normal behavior in water content, matric head, and recharge rates. Also provided in this report is a strategy for recharge estimation for the next 5 years.v

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Compendium of Data for the Hanford Site (Fiscal Years 2004 to 2008) Applicable to Estimation of Recharge Rates

Cited by 4 publications

References 52 publications

Soil Water Balance and Recharge Monitoring at the Hanford Site - FY09 Status Report

Soil Water Balance and Recharge Monitoring at the Hanford Site - FY09 Status Report

Technical Basis for Evaluating Surface Barriers to Protect Groundwater From Deep Vadose Zone Contamination

Soil Water Balance and Recharge Monitoring at the Hanford Site ? FY 2010 Status Report

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