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• Kennedy/Jenks Consultants I e. Depth to water f. Turbidity g. Color h. 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 I 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. Samples will typically be collected using clean bottom-employing bailers. Prior to sample collection, purge the bailer three times with water from the well. During sample collection, allow a 4-to 6-inch column of water to be purged from the bottom of the bailer before filling the appropriate sample containers. If the collected water is very turbid, or a bottom-emptying bailer is not used, carefully decant the water from the bailer into the appropriate sample containers. An attempt should be made to avoid agitation of the sample. 7. When multiple analyses will be performed, samples should be collected in order of decreasing sensitivity to volatilization (i.e., VOC samples first and metals last). 8. Collect groundwater samples using precleaned Teflon or stainless steel bailers, disposable bailer or precleaned Kemmerer (depth-specific) samplers. During sampling, record field parameterslobservations as described in Step 3 on K/J form F-43. As required by anticipated analyses, label and fill containers according to guidelines. 9. Ensure that each sample label documents sample, designation, type, date and time of collection, collector(s), location, and any additional information. 10. 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. 11. Each day, calibrate pH meters with buffer solutions and calibrate specific conductance meters using standard solutions. 4.4 Quality Control/Quality Assurance 1. 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). j Monitoring Well Installation Work Plan SOG 4 Page 2 Delicato Family Vineyards, Manteca, California y.VSWwpP ftNVobWA0766W1.DCLda cffid09'NtSVn-nsta0w W^bW'4'ON gxsemP.tlx