Hydrogeologic characterization data from the Area 5 Shallow Soil Trenches, Nevada Test Site, Nye County, Nevada
- Reynolds Electrical and Engineering Co., Inc., Las Vegas, NV (United States)
- Raytheon Services Nevada, Las Vegas, NV (United States)
The Shallow Soil Trenches (SST) project consists of vertical and horizontal transects in 4 shallow soil trenches excavated in 1993-94 in different alluvial deposits near the Area 5 Radioactive Waste Management Site at the Nevada Test Site, Nye County. These trenches are part of the site characterization program to support petitions for a RCRA groundwater monitoring waiver and an exemption from liners and leachate collection/detection systems. Purpose is to determine physical and hydrologic soil parameters affecting the movement of water in the upper few meters of undisturbed soil. The trenches were oriented perpendicular (east-west) to the depositional trend. Results indicate that the physical and hydrologic properties of the alluvial deposits are very similar and constant between transects and trenches. Increase in water content with depth (down to 1.0 m deep) in SST-3 is correlated with inorganic carbon content, indicating a caliche layer impeding downward water flow. Organic carbon was lower, indicating absence of humus. Average moisture velocity from Cl-36/Cl for the upper alluvial deposits is 2.9 mm/yr. It is concluded that the near-surface alluvial deposits are homogeneous material, with little net downward liquid flow in this near-surface alluvial portion of the vadose zone.
- Research Organization:
- Reynolds Electrical and Engineering Co., Inc., Las Vegas, NV (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC08-94NV11432
- OSTI ID:
- 54117
- Report Number(s):
- DOE/NV/11432--169; ON: DE95010585
- Country of Publication:
- United States
- Language:
- English
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Hydrogeologic Characterization Data from the Area 5 Shallow Soil Trenches