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SOP No. 22.0 Purging and Sampling Monitoring Well <br />Purging with a pump <br />Ensure that fine sediment has been removed by well development. <br />2. Determine the volume of water per well casing. <br />3. Refer to the user's manual for pump operating instructions. Users manuals for <br />the Grundfos Redi-flo 3 and the ProActive Hurricane are included in <br />Attachment 1. <br />4. Assemble pump, tubing or hoses and safety cable. <br />Do not allow pump, pump lead, tubing, or hoses to come into contact with the <br />ground surface. Place plastic sheeting around the well if necessary. <br />6. Slowly lower the pump and tubing to a depth approximately 10 ft below the <br />water level. Make sure the pump is deep enough so that purging does not <br />evacuate all the water. (Running the pump without water may cause damage.) <br />a. Attach pump power supply. <br />b. Begin pumping. <br />c. Collect water quality parameters. <br />d. As pumping continues, take water level readings periodically and lower <br />pump as necessary to ensure the pump does not run dry. <br />7. Dispose of the pumped water in an appropriate container for later disposal in <br />compliance with federal and state laws. <br />Attempt to remove a minimum of three well volumes before sampling. Record <br />the minimum purge volume in the field log book. Record water color, smell, <br />suspended particulates, discoloration of casing, casing diameter and material, <br />any unusual occurrences during sampling, and any pertinent weather details in <br />the field log book. <br />9. After the minimum purge volume has been removed, review the geochemical <br />measurements to ensure the readings have stabilized. Readings should be <br />within 10% of the previous reading. If the geochemical parameters have not <br />stabilized, continue to purge the well until the monitoring parameters do not <br />vary more than 10 percent between two successive well volumes removed. <br />10. Collect the groundwater samples after purging is complete (see above). <br />Filtering of Metal Samples <br />1. Assemble peristaltic pump per operating manual instructions. <br />2. At the pump intake, attach polyethylene tubing to the tubing at the head of the <br />peristaltic pump. The polyethylene tubing should be long enough to extend to <br />7/17/07 Page 5 of 9 R Squared Inc.