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APTIM Work Instruction Number: AMS-830-19-WI-03103 Revision: 0 Approval Date: 8/13/2021 DIRECT PUSH GROUNDWATER SAMPLING 1.0 PURPOSE This Work Instruction provides the standard practice for direct push groundwater sampling in support of environmental investigation and remediation projects, usually completed for third parties. Direct push groundwater sampling typically involves the placement of temporary well components within a direct push borehole and the recovery via a pump of the groundwater within the temporary well screened zone. The Work Instruction provides the minimum required steps and quality checks that APTIM and its subcontractors are to follow when performing the subject task. 2.0 APPLICATION/SCOPE This Work Instruction describes standards for the collection and documentation of groundwater samples from direct push temporary installations (such as the Hydropunch® system). It describes equipment, steps/instruction, and aspects of quality control. Although this work instruction does not specifically address other non-temporary well based sampling methods, many of its principles pertaining to elements such as documentation, sample retrieval and documentation may apply. 3.0 REQUIREMENTS Project Managers and Project Technical Leads are responsible for making sure that sampling personnel have been provided the appropriate plans (e.g. Sampling and Analysis Plan, Health and Safety plan, Field Sampling Plan, Quality Assurance Project Plan) detailing sampling locations, desired sample depths, target analytes and safety concerns. 4.0 TERMINOLOGY The following definitions are applicable to direct push groundwater sampling and this Work Instruction: Term Definition The creation of a boring by the displacement of soil without cutting or grinding, and without the production of mechanically altered soil (cuttings)at the ground surface. In direct push Direct Push methods, soil is displaced, primarily laterally, as a pipe or rod is forced vertically downward, creating a cylindrical space (i.e., a boring). Energy to create the boring is generated by a "direct push rig"and may use constant pressure (e.g., hydraulically- powered), vibration, or other means. Geoprobe®is a registered trademark of Geoprobe Systems, Inc. (www.geoprobe.com). The term geoprobe is informally used to refer to any small-diameter push-coring tool that is operated from a small vehicle and is used for site characterization Geoprobe (typically soils). Geoprobe Screen Point 15 and Screen Point 16 Systems are similar to the Hydropunch® II system (see below) and are considered suitable for use by this Work Instruction. ................................................................................................................................................................................:........................................................................................................................................................................................................................................................................................................ UNCONTROLLED COPY IF PRINTED Page 2 of 6