Hanford Site National Environmental Policy Act (NEPA) Characterization, Revision 15

Neitzel, D.A.; Bunn, Amoret L.; Burk, Kenneth W.; Cannon, Sandra D; Duncan, Joanne P; Fowler, Richard A.; Fritz, Brad G; Harvey, David; Hendrickson, P.L.; Horton, Duane G.; Last, George V; Poston, Ted M.; Prendergast-Kennedy, Ellen L; Reidel, Steve P.; Scott, Michael J.; Thorne, Paul D.; Woody, Dave M

doi:10.2172/15010377

Cited by 2 publications

(1 citation statement)

References 59 publications

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“…Other features relevant to the vadose zone conceptual model such as climate and weather statistics, terrestrial ecology, and projected land use are not specifically discussed here. Instead, the reader is referred to (Neitzel et al 2003) for general discussions of these specific features. Some aspects of the climate and weather phenomena are discussed later as they relate to precipitation, run-off, and infiltration events.…”

Section: Featuresmentioning

confidence: 99%

Vadose Zone Hydrogeology Data Package for the 2004 Composite Analysis

Freeman¹,

Cantrell²,

Fayer³

et al. 2004

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Section: Featuresmentioning

confidence: 99%

Vadose Zone Hydrogeology Data Package for the 2004 Composite Analysis

Freeman¹,

Cantrell²,

Fayer³

et al. 2004

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Multiple‐Year Water Balance of Soil Covers in a Semiarid Setting

Fayer

Gee

2006

J of Env Quality

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Surface covers are used to isolate contaminants in hazardous and low-level radioactive sites for time frames ranging from hundreds of years to millennia or more. In the absence of data for such durations, the long-term performance of surface barriers can only be represented with short-term tests or inferred from analogs and modeling. This paper provides evidence of field performance of soil covers for periods up to 17 yr. The results of lysimeter studies from a semiarid site in Washington State show that a cover design known as the Hanford Barrier, which consists of 1.5 m of silt loam above a sand-gravel capillary break, can nearly eliminate drainage. The results were similar if plants were present or not, demonstrating the robustness of the design. Furthermore, reducing the silt loam thickness to 1.0 m (as might occur via erosion), with or without plants, did not lead to drainage. When irrigated to mimic 3x average precipitation conditions, the vegetated Hanford Barrier continued to prevent drainage. Overall, the results showed no loss in performance during the 17 yr of testing. Only when plants were eliminated completely from the 3x precipitation test did drainage occur (rates ranged from 6 to 16 mm yr(-1)). In a separate test, replacing the top 0.2 m of silt loam with dune sand and reducing the plant cover did not lead immediately to the onset of drainage, but soil matric heads within the silt loam noticeably increased. This observation suggests that dune sand migration onto a surface cover has the potential to reduce a cover's ability to minimize deep drainage.

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Hanford Site National Environmental Policy Act (NEPA) Characterization, Revision 15

Abstract: sure Revision 15 was completed on time and presented in a way that is useful to everyone needing an upto-date description of the Hanford environment. Joanne Duncan also maintains the electronic copy of the document throughout the year.

Cited by 2 publications

References 59 publications

Vadose Zone Hydrogeology Data Package for the 2004 Composite Analysis

Vadose Zone Hydrogeology Data Package for the 2004 Composite Analysis

Multiple‐Year Water Balance of Soil Covers in a Semiarid Setting

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