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Groundwater Sampling Using a Bailer SOP Groundwater Sampling Using a Bailer SOP 1.0 Scope/Applicability: This standard operating procedure (SOP)provides guidance for sampling groundwater using a bailer. Most contaminated site investigations utilize some form of a groundwater sampling or monitoring program to fully characterize the nature and extent of groundwater contamination. To obtain a representative groundwater sample for chemical analysis, it is important to first remove stagnant water in the monitoring well before collecting a sample. This may be achieved using a variety of instruments including pumps and bailers. Once purging is completed and the correct laboratory-provided sample containers have been prepared, sampling may proceed. Sampling may be conducted with a variety of devices and need not be the same as the device used for purging. During purging and sampling, a field data sheet shall be completed, or an equal electronic data collection form used, a laboratory Chain-of-Custody, and all pertinent data recorded in the site logbook. This procedure is applicable to monitoring wells which are scheduled for sampling at sites where sampling groundwater from wells with a bailer is preferred. This procedure assumes that monitoring wells have been properly constructed according to appropriate regulatory requirements and the Monitoring Well Installation and Completion SOP. 2_0 Summary: This procedure entails collecting a groundwater sample from a well using a bailer(disposable or reusable). A bailer is a portable grab sampler typically used for retrieving groundwater samples from monitoring wells. Bailers are sometimes used to purge groundwater monitoring wells prior to sampling, collect profile samples of light non-aqueous phase liquid(LNAPL), well development, and bail-down tests to measure recharge rates and calculate hydraulic conductivity. Commonly used bailer sizes for monitoring well sampling include 1-inch, 2-inch and 4 inch. The sampling equipment must be sterile or thoroughly decontaminated prior to sampling in order to prevent cross-contamination of wells. The number and types of sample containers to be filled is based upon the types of analyses to be performed on the sample. For certain types of analyses, samples may need to be filtered in the field prior to being transferred into sample containers. Sample containers are labeled, stored,packaged, and shipped according to pre-defined protocols that are intended to preserve sample integrity from the time the sample is collected until it is received by the analytical laboratory. 3.0 Health and Safety: The Health and Safety considerations for conducting this procedure are described in the following documents: • Site Health and Safety Plan—H&S Plan Templates • Job Safety Analysis—Well Development and Groundwater Sampling Specific health and safety considerations for this procedure include: none Control#:AG-10034-00 Page 3 of 9 File Name:Groundwater Sampling Using a Bailer SOP