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i <br /> Section No b <br /> Revision No 1 �r <br /> Date January 13, 1992 <br /> Page 48 of 55 <br /> grade detergent and triple-rinsing in deionized water The probes will be <br /> towel-dried before being lowered into any well <br /> The electric well sounding device will be calibrated prior to use <br /> Calibration will include <br /> ■ measuring distance from electrode to reference markers printed or <br /> fastened to the cable by the manufacturer,, andrecording <br /> discrepancies, <br /> ■ comparing measurements made with the electric sounding device with <br /> measurements made using the chalked-type method (when possible) and <br /> recording results - <br /> All calibration notes will be recorded Instruments will be calibrated <br /> at least once every four hours <br /> All water level measurements will also be recorded Data to be recorded • <br /> include <br /> -� -�-- - <br /> as - date=and=time, - -- --- <br /> ■ personnel <br /> ■ weather conditions, <br /> ■ project number, <br /> ■ measuring method and device, <br /> ■ calibration data, <br /> ■ well number, <br /> a top of casing measuring point elevation; <br /> ■ measured depth to water, <br /> ■ water level elevation, <br /> ■ tidal data and references (if applicable) , <br /> ■ other observations <br /> 5 9 3 Slug Tests <br /> The slug test is a means of evaluating the hydraulic conductivity or <br /> transmissivity of a given water-bearing unit by the rate of rise or fall of <br /> the water level in a well after a known volume or "slug" of water is <br /> instantaneously displaced or removed from the well <br /> b-48 <br />