Actions for Characterization of Vadose Zone Sediment [electronic resource] : Borehole 299-E33-45 Near BX-102 in the B-BX-BY Waste Management Area

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Characterization of Vadose Zone Sediment [electronic resource] : Borehole 299-E33-45 Near BX-102 in the B-BX-BY Waste Management Area

Published
Washington, D.C. : United States. Dept. of Energy, 2002.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
PDFN
Additional Creators
Pacific Northwest National Laboratory (U.S.), United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The goal of the Tank Farm Vadose Zone Project is to define risks from past and future single-shell tank farm activities. This report contains all the geologic, geochemical, and selected physical characterization data collected on vadose zone sediment recovered from a borehole installed northeast of tank BX-102 (borehole 299-E33-45). This report also presents data on the sediment lithologies, the vertical extent of contamination, their migration potential, and the source of the contamination in the vadose zone and perched water east of the BX Tank Farm. The near horizontally bedded, northeasterly dipping sediment likely caused horizontal flow of the migrating contaminants. At borehole 299-E33-45, there are several fine-grained lens within the H2 unit that cause horizontally spreading of percolating fluids. The 21-ft thick Plio-pleistocene fine grained silt/clay unit is also an important horizontal flow conduit as evidenced by the perched water between 227-232 ft bgs. Based on comparing the depth of penetration of contaminants and comparing the percentages that are water leachable, uranium migrates slower than technetium-99 and nitrate. The technetium-99 desorption data are consistently near zero, meaning that the technetium-99 is not interacting with the sediment. In summary, the moisture content, pH, electrical conductivity, sodium, tritium, and uranium profiles do not suggest that plume has penetrated below 170 ft bgs. In general, the majority of the ratios of constituents found in the porewater in the Hanford formation sediments are closer to being from the 1951 metals waste solution that escaped tank BX-102 during a cascading accident. There may be a source of water, containing nitrate but not technetium, that is feeding the perched water zone. The deep vadose, perched and groundwater data do not present a clear picture on what might be occurring in the Pliopleistocene units.
Report Numbers
E 1.99:pnnl-14083
pnnl-14083
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Note
Published through SciTech Connect.
12/15/2002.
"pnnl-14083"
"820201000"
Legore, Virginia L.; Geiszler, Keith N.; Schaef, Herbert T.; Brown, Christopher F.; Lindberg, Michael J.; Gee, Glendon W.; Valenta, Michelle M.; Serne, R. Jeffrey; Orr, Robert D.; Last, George V.; Lanigan, David C.; Clayton, Ray E.; Kutnyakov, Igor V.; Lindenmeier, Clark W.; Baum, Steven R.; Vickerman, Tanya S.
Funding Information
AC05-76RL01830
View MARC record | catkey: 14350687