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Section Na 6 <br /> Revision No 1 <br /> Date January 13, 1992 <br /> Page 55 of 55 <br /> All electrical borehole logging will be completed by a registered <br /> geophysicist or licensed geophysical technician The project geologist will <br /> oversee the geophysical logging operation <br /> Logging will be completed prior to casing installation All geophysical <br /> logging tools will be washed using a laboratory grade detergent and rinsed <br /> prior to and between uses <br /> Geophysical logs will be compared to the lithologic log prepared by the <br /> geologist during borehole drilling as part of the instrument calibration <br /> process In addition, all instruments will be calibrated implementing the <br /> methods described in "Application of Borehole Geophysics <br /> 0 to Water Resources Investigations" (USGS, 1976) <br /> • <br /> 6-55 <br />