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Groundwater Well Installation Standard Operating Procedure SWE-FSOP-601;Revision 1 Ahtna Southwest Environmental Operations • Flush-threaded riser pipe/"blank casing, "typically Schedule 40 or Schedule 80 polyvinyl chloride (PVC),typically sized at two-inch or four-inch diameter for permanent monitoring wells and work-plan-specified diameters for temporary wells, extraction wells, etc. • Flush-threaded well screen,typically matching diameter and wall thickness of the riser pipe/"blank casing," with a slot size determined in advance based on site conditions and project objectives • Measuring tape • Plastic sheeting to protect decontaminated well materials [PFAS Project]: Clean, dry well materials should be stored within a protective medium (e.g., HDPE bag) or staged in a clean area for future use. • Threaded or slip end cap • Centralizer(s), as needed • Silica sand (sized based on the formation material) • Bentonite pellets or chips (for well seal or borehole fill according to project requirements) • Pure bentonite powder and cement (for grouting wells; confirm the type of each and mixture specifications) • Tremie pipe 4.0 Procedures Procedures are provided for: • Pre-Fieldwork tasks (Section 4.1) • Field Preparation (Section 4.2) • Mobilization and Set-Up (Section 4.3) • Well Installation (Section 4.4) • Temporary Monitoring Wells (Section 4.5) • Demobilization/Site Restoration (Section 4.6) 4.1 Pre-Fieldwork Tasks It is essential to be thoroughly familiar and compliant with state, county, or local well installation standards, codes, etc.They may contain requirements that must be used in conjunction with procedures presented in this SOP. Site-specific factors must be considered in the selection of well installation and completion materials, specification of well designs, and well-drilling methods. The well design and other specifications are incorporated into project work plans or as the FTL/PL directs. 4.1.1 Clearances Before starting any sonic boring, confirm that drilling locations have been appropriately cleared of potential overhead, surface, and subsurface hazards per the project work plans. This should include a utility locating subcontractor to identify subsurface infrastructure and anomalies. The clearance process also includes completing public utility locating service calls (e.g., Dig Alert, USA North 811, etc.) and Page 7 of 16