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Groundwater Sampling Using a Bailer SOP Procedure-specific equipment/supplies include: • Sample containers and labels • Chain-of-Custody forms/Custody seals • Safety knife or Scissors • 5-gallon buckets • Plastic sheeting • Shipping containers (i.e., coolers) • Packing materials (i.e., bubble wrap, etc.)—typically supplied by the laboratory • Ziploc-type plastic bags • Field parameter instruments [interface probe, multiparameter meter(pH, temp., specific conductivity, dissolved oxygen(DO), oxidation-reduction potential (ORP), turbidity meter] • Calibration standards • Nylon rope/or polypropylene twine (Tyger Twine) • Bailers per sampling plan • Bailer retrieval hook(can be used to retrieve bailers if bailer detaches from twine in the well while sampling) 7.0 Procedure: 1. Prepare for sampling using: Fieldwork Documentation SOP, VOC Sample Collection SOP, Sample Packaging and Shipping SOP, QA/QC Sample Collection SOP, and Groundwater Purge/Sampling Form - Purge (Attachment 1). 2. Water level and liquid levels measurement shall be taken in accordance with Water and Liquid Level Measurement SOP. 3. Measurement of field parameters shall be done in accordance with Measurement of Monitoring Well Field Parameters SOP. 4. Purge the well in accordance with Purging a Monitoring Well with a Bailer SOP or Purging a Monitoring Well with a Pump SOP. For no purge wells, skip this step. 5. Allow well to recharge after purging to 90% of the static water level. Variances from this requirement(e.g., for wells in low water yielding deposits) shall be approved by the Project Manager prior to implementation. 6. Assemble and label appropriate sample containers in accordance with Sample Labeling SOP. 7. Attach a new piece of nylon rope to a dedicated bailer, a disposable bailer, or a clean, decontaminated non-dedicated bailer. 8. Lower the bailer slowly and gently into the well, taking care not to shake the casing sides or to splash the bailer into the water. Stop lowering at a point adjacent to the screen, at or near the bottom of the well. 9. Allow the bailer to fill and then slowly and gently retrieve the bailer from the well while minimizing contact with the casing as much as practical, to prevent flakes of rust or other foreign material from getting into the bailer. 10. Remove the cap from the sample container and place it on the plastic sheet or in a location where it won't become contaminated or disturbed. 11. Begin pouring slowly from the bailer into the appropriate container. Fill sample containers for volatile organic compounds (VOCs) according to the procedures described in the VOC Sample Collection SOP. Samples shall Control#:AG-10034-00 Page 6 of 9 File Name:Groundwater Sampling Using a Bailer SOP