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December 23, 1999 Pcrge 6-2 • . Examine cable to determine how cable length is measured (i.e., is the reference mark above or below the reference number). • Record gage model and serial number in field book or on log sheet. B.4 PROCEDURC The field team will follow these procedures for water level measurement: • Remove protective well covers. Visually determine location ofineasuring point (MP) and compare to written description of MP. Typically, the MP will be a notch cut in the inner PVC casing or an arrow/mark inscribed on the casing. Por consistency, this mark is commonly placed on the north side of the well, although it could be placed in a manner to afford the best view during pumping and recovery tests. If an MP does not exist, place one on the well and document the placement in the field notebook. For a new well, measure the height of the • MP above the top of surface (pad). Record the height of the MP above the ground surface in a field book. Record electric sounder number in field book. • Turn meter on and depress test button. (A beep should be audible and the light should be on.) • Lower sensor probe into well, being careful not to unreel the cable too quickly. • Stop lowering the cable when the water sensor (light and/or sound) signals that the water table has been encountered. Once [he signal of water is activated, set the reel on the gmund or pad and then gently raise the sensor until the signal stops. Slowly lower the cable again until the signal again sounds. Repeat this procedure until the exact point at which the signal starts is obtained. This point can be marked with a finger or thumb nail which is in contact with the MP. • Read the tape from the down-hole end, as depth increases toward the reel. For water level sounders which are pre-marked to the nearest 0.01 feet, read the depth directly. If the sounder is not graduated to 0.0 ] feet, pull a short portion of the cable out of the well • and using a steel pocket tape measure, measure the length of cable between the closest depth marker and the mark held by your thumb or tnger. Use an engineer's tape and record the length of cable to the nearest l/100 ft. Agapito Associates, Inc.