ABSTRACT
The purpose of a groundwater remedial investigation is to determine the nature and extent of contamination identify present or potential problems caused by the contamination, and assist in the evaluation and selection of the remedial action. Data collection in a groundwater remedial investigation can begin with minimally intrusive techniques, called initial field screening techniques. Surface geophysical surveys are applied at the surface to provide a rapid reconnaissance of the hydrogeologic conditions at the site, such as depth to bedrock, degree of weathering, and the presence of clay lenses, fracture zones, or buried waste. The Electromagnetic methods use a transmitter coil to generate an electromagnetic field that induces eddy currents in the ground below the instrument. Environmental engineers often use the Seismic Refraction methods to determine the top of bedrock or depth of the water table, locate fractures or faults, and characterize the type of rock or degree of weathering.
