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Kennedy/Jenks Consultants Depth to water Turbidity Color Other observations as appropriate (draw down in well during purge, presence of oil, odors) 4. For wells providing sufficient yield, continue purging until field parameters stabilize or at least three casing volumes are removed. Wells providing insufficient yield are purged dry once, allowed to recover to 80 percent of original water levels, and purged dry again. Wells with extremely low yields are purged dry only once. 5. Following purging, allow wells to recover to approximately 80 percent of original water levels and then collect samples. 6. Collect the groundwater sample from the pump tubing. Turn the pump discharge down so that flow is slow and smooth. During sampling, record field parameters/observations as described in Step 3 on Kennedy/Jenks Form F-43. 7. Ensure that each sample label documents sample, designation, type, date and time of collection, collector(s), location, and any additional information. 8. Complete chain-of-custody records and include them with the samples, which are to be transported to the laboratory in insulated containers at 4°C. 9. Each day, calibrate pH meters with buffer solutions and calibrate specific conductance meters using standard solutions. E.4 Quality Control/Quality Assurance Collect duplicate samples immediately after the original samples are collected. Purging is not performed between original sample collection and collection of duplicate samples. Original and duplicate samples are collected sequentially, without appreciable delay between collection cycles. Duplicate samples will be submitted to the laboratory blind (i.e., not identifying the samples as a duplicate). E.5 Equipment Cleaning Prior to each sampling event, clean sampling equipment, including any purge bailers with high-purity phosphate-free soap or by steam cleaning. After washing the equipment, rinse it with potable water. Onsite, one set of(dedicated) sampling implements is used per well. Prior to returning the sampling implements to the laboratory (for thorough cleaning), ensure that these items are cleaned onsite. Disposable equipment (e.g., bailers)will be field cleaned and returned to the field equipment manager for disposal. E.6 Investigation-Derived Wastes Purge water is contained onsite, labeled, and placed in an appropriate container for disposition by the client. Appendix E Work Plan for Improved Detection Monitoring Program Page E-2 Musco Family Olive Company, Tracy, California g,uIwpipay4 kOW20104,W�wm walM- m166 27�pepmMlm.appd, dx