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SOP No. 22.0 Purging and Sampling Monitoring Well <br />Where TD = total well depth (ft), DTW = depth to water (ft), CID = casing inner <br />diameter (in). <br />7. To determine the number of gallons required to purge the well, multiply the <br />number of gallons in one well volume (calculations above) by three. Record the <br />minimum purge volume in the field log book. <br />8. Purge the well using either a clean disposable bailer or a decontaminated pump <br />(see below for equipment-specific instructions). <br />9. Affix a sample label to each sample container and complete all required <br />information (sample no., date, time, sampler's initials, analysis, preservatives). <br />Place clear tape over label. Record sample number, well number, date, time, <br />and the sampler's initials in the field book. <br />10. Collect the groundwater samples after purging is complete. <br />11. Complete chain-of-custody forms with appropriate sampling information. <br />12. Complete both front and back of the groundwater monitoring data log <br />(attachment) for each monitoring well or sampling point upon return from the <br />field, using data from the field book. <br />Purging with a bailer <br />1. Ensure that fine sediment has been removed by well development. <br />2. Determine the volume of water in well casing. <br />Tie a slip knot around the neck of the Teflon bailer. This should be done with <br />clean sample gloves. <br />4. Release the bailer down into the well until the bailer is completely submerged <br />below the water surface. Loop free end of bailer rope around wrist to prevent <br />bailer loss down well. <br />When the bailer is full, retrieve it from the well. Do not allow bailer or bailer <br />rope to come into contact with the ground surface. Place plastic sheeting around <br />the well if necessary. <br />6. Measure water quality parameters after the first well volume has been removed <br />(see SOP "Field Parameter Measurements"). Record water color, smell, <br />suspended particulates, discoloration of casing, casing diameter and material, any <br />unusual occurrences during sampling, and any pertinent weather details in the <br />field log book. <br />7/17/07 Page 3 of 9 R Squared Inc.