GeoTek   uses   a   suite   of   non   intrusive,   surface-based   geophysical   sensors   to   estimate   levee   and levee   foundation   soil   properties.   Geophysical   sensors   provide   continuous   soil   data   along   survey paths.   In   some   geologic   settings,   data   can   be   collected   to   depths   in   excess   of   50   meters.   ERDC geophysicists   have   conducted   surveys   on   several   levee   systems   using   combinations   of   ground penetrating   radar,   electromagnetic   (EM)   induction,   dc      electrical   resistivity,   capacitively   coupled resistivity   (CCR),   and   magnetic   and   seismic   methods   to   rapidly   interrogate   subsurface   conditions. Geophysical   surveys   can   also   be   used   in   locating   buried   utilities   or   structures   within   or   beneath levees, as these can provide a seepage path during flooding periods.
Geotechnical   Engineering   involves   soil   and   its   properties   relevant   to   groundwater   flow,   bearing capacity   for   foundations,   settlement   and   compaction,   slope   stability,   tunneling   and   mining,   and   a variety of other issues associated with activities on or below the ground surface. .
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