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Groundwater Sampling Using a Bailer SOP Interferences having the potential to impact the quality of the final product include: • Stagnant water(e.g., the well water above the screened section in confined wells or unconfined wells with submerged screens)may contain foreign material inadvertently or deliberately introduced from the surface resulting in an unrepresentative sample. • A non-representative sample can also result from excessive pre-bailing of the monitoring well. Excessive bailing can dilute or increase the contaminant concentrations from what is representative of the location. • Water sample turbidity or chemical composition may impact the ability to measure certain field parameters. • Excessive disruption of water during sample collection from the well or pouring into the bottle can serve to reduce the VOC concentration in samples as a result of volatilization. 5.0 Personnel Qualifications/Responsibilities: Personnel performing this procedure are required to have the following qualifications: • HSSE Training in accordance with Health, Safety, Security, and Environment Practice • All Antea Group personnel must have sufficient training to meet the project objectives and be approved/calibrated in the Antea Group Workforce Optimization Database for SOP implementation. The minimum roles involved and their responsibilities in this procedure include: • Project Manager (PM)—Responsible for determining, communicating, and upholding the regulatory, client, and other requirements associated with performing this procedure as part of a project-specific scope of work. • Project Professional (PP)—Responsible for creating project-specific scopes of work requiring this procedure in accordance with the identified requirements of this procedure. • Staff Professional (SP)—Responsible for implementing project-specific scopes of work requiring this procedure in accordance with this procedure. Communicating to the PP or PM the project status and elevating any questions and unexpected field observations that may affect project completion. 6.0 Equipment/Supplies: The following is the typical list of equipment required for completing this procedure: • Field Safety Equipment Bag • Traffic control devices, as defined in the Antea Group HSSE Practices - Site Control Policy • Field logbook and appropriate field form(s) • Waterproof permanent pens and markers • Mobile phone - with digital camera and iForm app installed • Spare locks - for buildings, compounds, and well covers (if appropriate) • Spare well plug/expansion caps to replace as needed • Ratchet—to remove bolts to access well covers (if appropriate) • Keys -to access existing on-site locks (if appropriate) • Decontamination supplies/equipment(if appropriate) Control#:AG-10034-00 Page 5 of 9 File Name:Groundwater Sampling Using a Bailer SOP