COLOG, a division of Layne, has traditionally had a strong reputation as the innovative leader in borehole geophysics applied to groundwater investigations. Layne offers a complete suite of borehole geophysical services. Aside from the standard geophysical logs, we offer cutting edge technologies that other geophysical logging companies cannot furnish. These include the development of HydroPhysical Logging (HPL), Borehole Image Processing (BIPS), Acoustic Televiewer (ATV) Logs, and other borehole logs. These logging techniques evaluate water quality and rock/sediment properties that are critical for water supply and environmental studies. More detailed information is available by visiting www.colog.com.