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Delineating Subsurface Contamination Using Geostatistical and Non-Intrusive Geophysical Methodologies

by Sandra Bowling,
Wayne Woldt,
Dennis Schulte,



Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water

Abstract:

Electromagnetic (EM) conductivity surveys are becoming a more practiced technique in screening for contamination of soil and groundwater. This non-intrusive geophysical approach detects contaminant presence by measuring the subsurface's increased conductance to electrical flow. Geostatistical methodologies are employed for interpretation of EM survey results through analysis of spatial correlation and continuity of collected field data. In this case, kriging is used to estimate expected values at unsampled points. A case study is presented in which results of an EM survey are mapped and compared with direct borehole data for a livestock production system in Nebraska.

Subject Headings: Soil pollution | Groundwater pollution | Geophysical surveys | Surveys (non-geomatic) | Surveying methods | Subsurface investigation | Spatial analysis | Nebraska | United States

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