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J <br /> using either a centrifugal pump connected to a dedicated Wattera pump or a pre-cleaned <br /> submersible pump. Temperature, pH, and specific conductance of the purge water will be <br /> monitored during the purging process at regular intervals. Purging will cease when the <br /> monitored parameters have stabilized (three consecutive readings not varying by more than <br /> 10-percent) and a minimum of three well volumes have been purged <br /> In the event a well dries out during purging, the well will be allowed to recover to <br /> 80-percent of it's original well volume, or for 24-hours, whichever is less, prior to collecting <br /> a groundwater sample. <br /> Groundwater Monitoring Well Sampling <br /> Once a well has been successfully purged a groundwater sample will be collected using <br /> a disposable polyethylene bailer connected to clean nylon or polyethylene cord. The bailer will <br /> be lowered slowly into the water to avoid agitation of the sample. A portion of the sample will <br /> be placed in a container and the monitoring parameters will be recorded The remaining <br /> portion of the sample will be transferred from the bailer to the appropriate, laboratory supplied <br /> sampling bottles, using a bottom emptying device Containers for volatile organic analyses will <br /> be filled completely, leaving a positive meniscus, so no airspace remains in the vial after <br /> sealing. <br /> The sample bottles will be labeled with the well identification (i e. MW-1, MW-2, etc), <br /> date and time of the sample collection, the field technicians initials, fob number, analyses to <br /> be performed, and other relevant information. Samples will immediately be placed in an <br /> insulated cooler containing blue ice The samples will be maintained at approximately 4°C <br /> until reaching the analytical laboratory. <br /> Laboratory Analysis <br /> Samples will be shipped, under appropriate chain-of-custody procedures, to SPL <br /> Laboratory in Houston, Texas, within 48-hours following collection. SPL Laboratory is <br /> certified by the State of California for performing the requested analyses. Samples will be <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHg), diesel fuel, (TPHd), and <br /> benzene, toluene, ethylbenzene, and xylene isomers, following Environmental Protection <br /> Agency Methods 5030, 8015 modified, and 8020. Samples will be analyzed on a standard two <br /> week turn-around time. <br /> QA/QC Procedures <br /> Instmament calibration_ Equipment used to monitor groundwater parameters will be <br /> calibrated prior to beginning purging at the site. Monitoring equipment will be calibrated <br /> following the manufactures instructions using laboratory grade standards. <br /> Equipment Decontamination. Non-disposable and non-dedicated sampling equipment <br /> will be cleaned prior to use and between uses in each well. Downhole equipment will be <br />