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..i Kennedy/Jenks Consukants - Specific conductance - Dissolved oxygen - Oxidation-reduction potential (ORP) - Other observations as appropriate (turbidity, color, presence of odors, sheen, etc). (4) Continue purging until water quality parameters have stabilized (refer to "Stabilization Criteria for Adequacy of Monitoring Well Purging" below) and/or a minimum of three wetted-casing volumes of water have been removed from the well. If a well purges dry, let it recover to 80 percent of original water column, then sample. If the well takes a very long time to recover(i.e., longer than 2 hours), try to sample the well at the end of day or first thing the next day. (5) Collect the sample in pre-cleaned sample containers suitable for the laboratory analyses to be performed. (6) If sampling using a bailer, use a bottom-emptying device or other technique to avoid sample agitation. If the collected water is very turbid, or a bottom-emptying bailer is not used, properly transfer the water from the bailer into the appropriate sample containers. Be careful to avoid agitating the sample. When sampling for VOCs, turn the bottle upside down after filling the container to identify possible headspace. If bubbles are present, top off the sample container or resample. 3. Field Filtering Groundwater Samples. Groundwater sample filtering and/or preservation should be performed in accordance with the requirements of the analytical method being specified and any other project-specific requirements. For example, samples collected for dissolved metals are typically filtered using a 0.45 pm filter. 4. Sample Collection Considerations. When multiple analyses will be performed, collect the samples in order of decreasing sensitivity to volatilization (i.e., VOC samples first and metals last). When sampling for VOCs, turn the sample container upside down after filling to identify possible headspace. If bubbles are present, top off the sample bottle or resample (do not reuse bottles, especially if they have been pre-preserved by the vendor or laboratory). If possible, the pump should not be moved or turned off between purging and sampling; however, the pump may need to be turned off for a very brief period (as a practical matter) so field personnel can handle samples and minimize the potential for water to splash on the ground surface. The ground surface should be protected from incidental splashing, especially if water from the well would be considered a hazardous waste for disposal purposes. 5. Monitoring Wells with Slow Recharge. If a well purges dry, let it recover to 80 percent of original water column, then sample. If the well takes a very long time to recover(i.e., longer than 2 hours), try to sample the well at the end of day or first thing the next day. 6. Sample Container Filling and Shipping. Fill the appropriate containers for the analyses to be requested and ensure that the required label information is completely and accurately filled in. Follow sampling packaging, shipping, and chain-of-custody procedures (see applicable SOG). 7. Decontamination. Follow personnel and equipment decontamination procedures(see applicable SOG). Monitoring Well Replacement Work Plan, SOG 4 Sutter Home Lodi Winery, Lodi, California Page 4 of 7 glkltryyovpbdmin�'robW810865005.15 siMMwn,e109vepnrtsMWlnHdl wplappb_syN pwsmnp revJrm.Ea