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SOP No. 22.0 Purging and Sampling Monitoring Well <br />8. Attempt to remove a minimum of three well volumes before sampling. Record the <br />minimum purge volume in the field log book. Record water color, smell, suspended <br />particulates, discoloration of casing, casing diameter and material, any unusual <br />occurrences during sampling, and any pertinent weather details in 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 within 10% of <br />the previous reading. If the geochemical parameters have not stabilized, continue to <br />purge the well until the monitoring parameters do not vary more than 10 percent between <br />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 peristaltic <br />pump. The polyethylene tubing should be long enough to extend to the bottom of the <br />bailer. At the pump discharge end, attach a clean 0.45-micron filter to the Teflon tubing. <br />3. Turn on the pump and draw the water through the bailer, through the pump and filter, and <br />into the sample container. <br />4. Disassemble the pump head and discard the polyethylene and Teflon tubing and filter in a <br />plastic bag. <br />6.0 QUALITY ASSURANCE/QUALITY CONTROL <br />All activities conducted under this SOP are subject to quality assurance and quality control <br />audits. Corrective action will be implemented immediately. <br />7.0 DOCUMENTATION <br />All actions will be documented in accordance with SOP 52 "Note Taking and Log Book Entries. <br />8.0 REFERENCES <br />EPA, March 2001, Guidance for Preparing Standard Operating Procedures (SOPS) EPA QA/G-6, <br />EPA/240B-02/004, Office of Environmental Information, Washington, D.C. <br />EPA, March 2001, EPA Requirements for Quality Management Plans, EPA A/R-2, EPA/240/13- <br />02/002, Office of Environmental Information, Washington, D.C. <br />EPA, November, 2002, Guidance on Environmental Verification and Data Validation, EPA <br />QA/G-8, EPA/240/R-02/004, Office of Environmental Information, Washington, D.C. <br />EPA, December 2002, Guidance for Quality Assurance Project Plans, EPA AQ/G-5, <br />EPA/240/R-2/009, Office of Environmental Information, Washington, D.C. <br />4/23/07 Page 5 of 7 R Squared Inc. <br />Attachment A