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SOP. Water <br />Level Measurement <br />V. Health and Safety Considerations <br />Well covers and casings should be carefully 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 />lit 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 r„°asuring <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 are 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 />i <br />b <br /> nt <br />y <br />measuring reference point on the monitoring well casing. If one is not found, create a reference po <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 /> <br /> <br />t SIM <br />sOP02-Water Level Measurement Ane.dw <br />1