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Section No 6 <br /> Revision No 1 <br /> Date January 13, 1992 <br /> Page 47 of 55 <br /> The procedure for collecting water level measurement using the electric <br /> well probe are as follows• <br /> r lower probe down well casing until water level is reached as <br /> indicated by light, buzzer, or meter on the sounding device, <br /> ■ mark or carefully hold cable at surveyed top of casing (TOC) <br /> measuring point or at an elevation equal to this point, <br /> ■ measure and record depth-to-water level, <br /> ■ verify by repeating measuring processes and record results (The <br /> results should be within 0 01 feet ) <br /> The chalked tape method involves using a steel or fiberglass tape with <br /> a weight attached to the bottom The lower 2 to 3 feet of the tape is wiped <br /> dry and coated with carpenter's chalk The water level measurement procedure <br /> using this method is as follows <br /> o lower the tape into the well until the chalked section is below the <br /> water, <br /> ■ hold one of the foot marks on the tape exactly at the top of the <br /> surveyed TOC measuring point and record measurement, <br /> ■ remove the tape from the well in a manner such that the chalked <br /> section is not dipped further below the water level, <br /> ■ upon withdrawal, record length of wetted tape section, <br /> ■ subtract length of wetted section from total length of tape held to <br /> calculate measured depth to water, and record results <br /> Water level measurements will be collected in as short a time as <br /> possible in order to approach an instantaneous representative of water level <br /> and potentiometric surfaces <br /> Prior to and between use, the ends of the electric well sounding device <br /> and the steel/fiberglass tape will be thoroughly cleaned using a laboratory <br /> 6-47 <br />