Geophysical Investigations Of A Waste Deposit In Southern Sweden

Geophysical surveying was performed in order to investigate the existence and location of<br>buried metal waste, which might be drums containing hazardous waste. Three methods were<br>used: magnetometry, slingram (dual loop EM) and electrical resistivity. The magnetic and<br>slingram surveys were carried out manually, whereas a computer controlled data acquisition<br>system was used for the resistivity surveying.<br>The magnetic profiles show the presence of object with high magnetic susceptibility. The<br>anomalies can be joined together and lie parallel to extension of the valley. Magnetic<br>modelling shows that the anomalies fit well with metallic objects in the bottom of the original<br>valley.<br>The slingram results indicate objects with high electrical conductivity. The anomalies are<br>more point shaped than the magnetic ones, but correspond well in location.<br>The resistivity data were measured and interpreted as two-dimensional sections, using the<br>Wenner array, which were merged to form a three-dimensional model. A number of low<br>resistive objects can be identified in the images, which agree with the magnetic as well as the<br>slingram results.<br>Excavation revealed many metal objects, including a large number flattened metal drums,<br>corresponding to the geophysical anomalies. However, no hazardous waste was found.