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Title: Sampling and Analysis Plan for Environmental Control Number: Revision Date: Page 9 of 30 <br /> Groundwater Monitoring I PUE.EN.D.026.04 2/19/2020 <br /> • When using a bailer to sample the well, lower the bailer slowly through water column <br /> until the bottom of the bailer reaches the sample depth. The sample depth is indicated <br /> by a mark or adhesive tape on the cable. The bailer should be raised to the surface and <br /> the sample transferred to sample containers with minimal agitation and contact with <br /> the atmosphere. The sample should be allowed to flow down the side of the receiving <br /> container and not allowed to cascade onto the bottom of the container. Sample water <br /> may be homogenized in a bulk container (preferably an emptied distilled water jug) <br /> prior to transfer to sample bottles. <br /> 3.4.2 Method B for Groundwater Sample Collection <br /> This method describes procedures to be performed when the monitoring well(s) are low <br /> yielding. A low yielding well is one that is capable of recharging within approximately three <br /> to four hours. Sample handling and transfer is handled the same way as Method A. This <br /> sampling procedure includes the following: <br /> • Purge the well and measure field water quality parameters after each wetted casing volume <br /> until it is dry. <br /> • If there is sufficient recovery after three to four hours, take another throw away sample to <br /> determine temperature, pH and conductivity. Record these values. Collect samples for <br /> laboratory analysis in the order indicated in Section 4.2. Sample may not be collected for <br /> analysis of all parameters if the well bails dry before completing the suite. <br /> • After the last groundwater sample is taken, again take a throw-away sample to measure and <br /> record the pH,temperature and conductivity if sufficient volume can be recovered. <br /> 3.4.3 Method C for Groundwater Sample Collection <br /> This method describes procedures to be performed when the monitoring well(s) are very low <br /> yielding.A"very low yielding"well is one whose time of recharge for sampling is greater than <br /> three to four hours and less than 24 hours. Sample handling and transfer is handled the same <br /> way as Method A. This sampling procedure includes the following: <br /> • Purge the well and measure field water quality parameters after each wetted casing <br /> volume until it is dry. <br /> • Return to the well in approximately 24 hours. Measure the water level in the well. If <br /> sufficient recovery has occurred, pump/bail the water into a bulk sample container. <br /> From the bulk sample container determine the temperature, pH and conductivity. <br /> Transfer water from the bulk sample container to sample bottles in the order indicated <br /> in Section 4.2 until the suite is complete or until the well purges dry. <br /> For all methods, samples will be stored under ice in an ice chest pending delivery to the <br /> laboratory. <br /> 3.5 Equipment Decontamination Procedures <br /> Dedicated and disposable equipment(e.g.,bailers and rope)will be used to the extent possible <br /> to eliminate the need for equipment decontamination prior to and between uses, and the <br />