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1 <br />. BCR & Associates, Ltd. Rev 01 12193 <br /> 1 Standard Procedure 6 <br /> Water Level Measurement <br /> See also Monitoring well Purging and Sampling, Equipment Decontamination, <br /> Water Level Measurement <br /> Water level measurements are made with decontaminated equipment. Measuring <br /> will also proceed from the cleanest well to the one with greatest known <br /> concentration of contaminants. The measuring tape shall be specifically made for <br /> water level measurements, and have an accuracy of at least 11100 foot over 40 <br /> feet length. Monitoring wells with expansive-plug type well caps are opened, and <br /> the water level is allowed to equalize for several minutes prior to measurement. <br /> The transducer power gain is activated and the unit is lowered into the well until <br /> the water level is encountered. If the unit encounters difficulty reaching the <br /> water, the inferred cause is noted on the field form (e.g. well is crooked, <br /> cracked...). The water table is indicated by an audible and visual signal. The <br /> depth on the tape is measured from the established well head measuring point, <br /> usually consisting of a black arrow or notch on the north side of the PVC well <br /> riser. The depth to water is recorded, and subtracted from the elevation of the <br /> well head measuring point. This gives the groundwater elevation in feet. The unit <br /> is decontaminated, and successive wells are measured and recorded. <br /> a <br /> a <br />