Determining the location of old, poorly documented buried landfills has become a significant concern in many places where development is hindered. Today new methodology provides a means for the efficient acquisition of induced polarization and resistivity data. Case studies of five landfills verified the accuracy of the technique and the acquisition speed of the system. At all sites IP anomalies (> 3 milliseconds) correspond to solid waste verified by drilling and trenching. Using a multiplexer capable of interfacing between a multichannel receiver, a transmitter and 30 electrodes allowed IP and resistivity data acquisition at extremely fast rates. Data acquisition in the dipole-dipole configuration consisted of a station spacing of 2.3 meters and a dipole size of 4.6 meters with twelve points collected along each diagonal (n=0.5, n=1.0, …n=6). The electric-field signal was sensed at the receiver site using tin-coated copper braid electrodes. A time domain, 0.5 Hz signal was used, stacking and averaging eight cycles to minimize random noise. Measuring all data points at least twice established repeatability of the data. A crew of three can acquire 3300 data points plus repeats in one day (approximately 800 line meters).


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