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Title: Sampling and Analysis Plan for Environmental Control Number: Revision Date: Groundwater Monitoring PUE.EN.D.026.03 1 10/18/2019 Page 9 of 23 lowering the bailer to the bottom of the well. Once the bailer is gently resting on the bottom, the field person is to mark this location on the cable. The mark is to be placed directly across from the measuring point while the cable is held taut. Raise the bailer one-foot above the bottom of the well. Mark the cable or place adhesive tape on the cable to indicate the sample depth for future reference. Taking a purge water sample at this elevation should avoid undue amounts of sediments in the sample and prevent sediment interfering with closure of the bailer valve. Prior to extracting water for field measurement, the well should be purged by bailing from the bottom of the well. Take "throw-away" samples from the sample depth to determine temperature, pH and conductivity after each casing volume and purge as described above. • When using a bailer to sample the well, lower the bailer slowly through water column until the bottom of the bailer reaches the sample depth. The sample depth is indicated by a mark or adhesive tape on the cable. The bailer should be raised to the surface and the sample transferred to sample containers with minimal agitation and contact with the atmosphere. The sample should be allowed to flow down the side of the receiving container and not allowed to cascade onto the bottom of the container. Sample water may be homogenized in a bulk container (preferably an emptied distilled water jug)prior to transfer to sample bottles. 3.4.2 Method B for Groundwater Sample Collection This method describes procedures to be performed when the monitoring well(s) are low yielding. A low yielding well is one that is capable of recharging within approximately three to four hours. Sample handling and transfer is handled the same way as Method A. This sampling procedure includes the following: • Purge the well and measure field water quality parameters after each wetted casing volume until it is dry. • If there is sufficient recovery after three to four hours,take another throw away sample to determine temperature,pH and conductivity. Record these values. Collect samples for laboratory analysis in the order indicated in Section 4.2. Sample may not be collected for analysis of all parameters if the well bails dry before completing the suite. • After the last groundwater sample is taken, again take a throw-away sample to measure and record the pH,temperature and conductivity if sufficient volume can be recovered. 3.4.3 Method C for Groundwater Sample Collection This method describes procedures to be performed when the monitoring well(s) are very low yielding. A "very low yielding" well is one whose time of recharge for sampling is greater than three to four hours and less than 24 hours. Sample handling and transfer is handled the same way as Method A. This sampling procedure includes the following: