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1 • <br /> ' Data Analysis <br /> Upon completion of a dipole-dipole survey, apparent resistivity data are downloaded from the Sting to <br /> a lap-top computer using the program STINGDMP. The data are inverted to true resistivity versus depth <br /> and distance using the program EARTHIMAGER 2D. Both programs are written by AGI. The data <br /> generated by the EARTHIMAGER 21) program are then gridded and contoured using the computer <br /> ' program Surfer 8.0 by Golden Software to produce 2-D models. <br /> ' Limitations <br /> A common feature of all electrical methods is that the models derived from the electric profiling are not <br /> unique. That is,depending on the subsurface geo-electric structure,there may be many models that will <br /> produce essentially the same apparent resistivities. This is known as the principal of equivalence. To <br /> overcome this limitation, computer software programs include routines for evaluating the equivalence <br /> ' of a given model relative to the observed resistivity values,resulting in a model that provides the closest <br /> fit to the observed data. <br /> t <br /> 1 <br /> A-6 <br />