2011-08-08_REVISION - M1977493 (38)

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Document Owner: Climax Mine Environmental Department iii Review Cycle: As Needed Document Name: Environmental Water Quality Sampling Step by Step Procedure METHODS AND PROCEDURES Equipment/Instrumentation Calibration Last Revised /Reviewed On: 06 -27 -2011 Page 3 of 6 Document Class: EMS The following sections describe the methods and procedures required to collect representative water samples. In general, pH and temperature are required for every sample. Additional field parameters can include conductivity, DO, ORP, and depth -to -water for monitoring wells. These will be determined with portable hand -held or lab instruments. Prior to the sampling event, perform maintenance checks on the equipment and instruments . according to the manufacturer's manual. This will ensure the equipment/instruments are working properly before they are used in the field. The instruments should be calibrated at the beginning of each day. If the field measurement falls outside the calibration range, the instrument must be recalibrated so that all the measurements fall within the calibration range. Groundwater Level Measurements • An initial depth to water level will be measured prior to initiation of sampling activities. The following procedure will be used to measure the water levels: • Inspect the well head area for evidence of damage or disturbance. Record notable observations in the field logbook. • Open the protective outer cover of the monitoring well. Remove any debris that has accumulated around the riser near the well plug. If water is present above the top of the riser and well plug, remove the water prior to opening the well plug. Do not open the well until the water above the well head has been removed. • Using an electronic or other water level indicator device accurate to 0.01 feet, determine the distance between the established reference point (usually a v- notch, indelible mark or top of the well riser) and the surface of the standing water present in the well. Record data on the sampling form. Repeat this measurement until two successive readings agree within 0.01 feet. • Decontaminate the water level indicator (unless dedicated to the well). Sample Collection Groundwater Monitoring Well Sampling Wells must be purged prior to sampling to ensure that representative groundwater is obtained from the water - bearing unit. The monitoring wells will be purged and then sampled for laboratory analysis. IF Purging will occur until the water quality characteristics (pH, temperature and conductivity) have stabilized. Stabilization is achieved when the change between successive readings of pH is within 0.1 and less than 10% for temperature and conductivity. Stabilization of groundwater measurements PRINTED DOCUMENTS ARE UNCONTROLLED