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1 <br />SOP: Water <br />Level Measurement <br />' V. Health and Safety Considerations <br />Well covers and casings should be cazefully removed to avoid potential contact with insects, reptiles, animals, <br />or birds nesting in the well casings. <br />VI. Procedure <br />Water-level Indicators <br />Calibration procedures and groundwater-level measurement procedures for water-level indicators are described <br />below. <br />1. Calibration <br />The water-level indicator will be tested to verify that the meter has been correctly calibrated by the <br />manufacturer. The following steps will be used to verify the accuracy of the water-level indicator: <br />A. Measure the length between each 1 foot increment marker on the water-level indicator with a measuring <br />tape. The first 150 feet of the water-level indicator measuring tape will be checked for accuracy. <br />B. If the water-level indicator measuring tape is inaccurate, the probe will be sent back to the <br />manufacturer. <br />C. Equipment calibration will be recorded in the field logbook. <br />2. Groundwater-Level Measurement <br />Procedures for obtaining water elevations using an electronic water-level indicator aze as follows: <br />A. Record site and monitoring well number in field logbook using indelible ink, along with date, time, <br />personnel, and weather conditions. <br />B. Use safety equipment as specified in the Mine HASP. <br />C. Decontaminate the water-level level indicator with an Alconox and water scrub, a distilled water rinse, a <br />solvent rinse, and another distilled water rinse between each well in accordance with Field Sampling <br />Equipment Decontamination SOP. <br />D. Unlock and open the monitoring well cover while standing upwind from the well <br />E. Allow the water level in the well to equilibrate with atmospheric pressure for a few minutes. Locate a <br />measuring reference point on the monitoring well casing. If one is not found, create a reference point by <br />notching the inner casing (or outer if an inner casing is not present) with a hacksaw. All downhole <br />measurements will be taken from the reference point. Document the creation of any new reference <br />point or alteration of the existing reference point. <br />F. Measure to the nearest 0.01 foot and record the height of the inner and outer casing from reference point <br />to ground level. <br />iireros z <br />SOPo2-Water Level Measurement-Mine.tlx <br />