Rectangular Schlumberger resistivity arrays for delineating vadose zone clay-lined fractures in shallow tuff

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Rectangular Schlumberger arrays can be used for 2-dimensional lateral profiling of apparent resistivity at a unique current electrode separation, hence single depth of penetration. Numerous apparent resistivity measurements are collected moving the potential electrodes (fixed MN spacing) within a rectangle of defined dimensions. The method provides a fast, cost-effective means for the collection of dense resistivity data to provide high-resolution information on subsurface hydrogeologic conditions. Several rectangular Schlumberger resistivity arrays were employed at Los Alamos National Laboratory (LANL) from 1989 through 1995 in an area adjacent to and downhill from an outfall pipe, septic tank, septic drainfield, and sump. Six ... continued below

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13 p.

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Miele, M.; Laymon, D.; Gilkeson, R. & Michelotti, R. May 1, 1996.

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  • Miele, M. ICF Kaiser, Rancho Cordova, CA (United States)
  • Laymon, D. ICF Kaiser, Chicago, IL (United States)
  • Gilkeson, R. ERM PMC Inc., Los Alamos, New Mexico (United States)
  • Michelotti, R. Los Alamos National Lab., NM (United States)

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Rectangular Schlumberger arrays can be used for 2-dimensional lateral profiling of apparent resistivity at a unique current electrode separation, hence single depth of penetration. Numerous apparent resistivity measurements are collected moving the potential electrodes (fixed MN spacing) within a rectangle of defined dimensions. The method provides a fast, cost-effective means for the collection of dense resistivity data to provide high-resolution information on subsurface hydrogeologic conditions. Several rectangular Schlumberger resistivity arrays were employed at Los Alamos National Laboratory (LANL) from 1989 through 1995 in an area adjacent to and downhill from an outfall pipe, septic tank, septic drainfield, and sump. Six rectangular arrays with 2 AB spacings were used to delineate lateral low resistivity anomalies that may be related to fractures that contain clay and/or vadose zone water. Duplicate arrays collected over a three year time period exhibited very good data repeatability. The properties of tritium make it an excellent groundwater tracer. Because tritium was present in discharged water from all of the anthropogenic sources in the vicinity it was used for this purpose. One major low resistivity anomaly correlates with relatively high tritium concentrations in the tuff. This was determined from borehole samples collected within and outside of the anomalous zone. The anomaly is interpreted to be due to fractures that contain clay from the soil profile. The clay was deposited in the fractures by aeolian processes and by surface water infiltration. The fractures likely served as a shallow vadose zone groundwater pathway.

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13 p.

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INIS; OSTI as DE96008703

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  • 9. annual symposium on the application of geophysics to engineering and environmental problems, Denver, CO (United States), 15 Apr - 1 May 1996

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  • Other: DE96008703
  • Report No.: LA-UR--96-512
  • Report No.: CONF-960477--2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 224261
  • Archival Resource Key: ark:/67531/metadc670637

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  • May 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 29, 2016, 7:16 p.m.

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Miele, M.; Laymon, D.; Gilkeson, R. & Michelotti, R. Rectangular Schlumberger resistivity arrays for delineating vadose zone clay-lined fractures in shallow tuff, article, May 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc670637/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.