Delineating Subsurface Contamination Using Geostatistical and Non-Intrusive Geophysical Methodologiesby Sandra Bowling,
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: Groundwater pollution | Soil surveys | Soil pollution | Spatial analysis | Flow measurement | Case studies | Pollutants | Nebraska | North America | United States
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