Electromagnetic Terrain Conductivity Survey Methods For Detection Of Seepage Plumes From Animal Waste Lagoons

A four-year series of frequency-domain electromagnetic terrain conductivity surveys was used<br>to track the changes in ground-water contamination due to seepage from animal waste lagoons. The<br>survey data were compared with electrical conductivities of ground water samples from the same<br>period. Four instrument configurations were compared to determine which best reflected changes<br>in ground water conductivity.<br>Sequential surveys provide a good qualitative indicator of changing conditions. Increases in<br>ground water conductivity were reflected in simultaneous increases in the survey readings, but decreases<br>in the ground water conductivity produced somewhat smaller and less distinct changes in<br>survey readings, indicating a residual effect of the seepage.