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Portable geophysical loggers that are specifically designed for ground-water applications are available. The geophysical loggers are PC-based and have menu-driven software for the collection, display, and analysis of digital log data. Drawworks for shallow investigations are highly portable, and some have plastic-coated logging cables for easy decontamination. Many of the logging probes can be used in boreholes with a diameter as small as 5 centimeters. Many probes are capable of collecting multiple geophysical parameters with a single logging run, thereby greatly increasing the efficiency of the logging operation.