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Groundwater Well Development Field Standard Operating Procedure SWE-FSOP-602;Revision 1 Ahtna Southwest Environmental Operations 4.2.1 Site Preparation Before mobilizing, the logistics of well development, fluid containment, and site management should be determined.The site should be prepared as per the project work plans. • Appropriate barriers and markers should be in place prior to well development, as per the site health and safety plan • Plastic sheeting (e.g.,VisqueenT"") may be required beneath the rig • Appropriate IDW containment should be set onsite prior to the commencement of well development 4.2.2 Discussion of Site Conditions Before development operations begin,the following must be completed: • The FTL or designee should assess the well site with the driller. This assessment should identify potential hazards and determine how operations may impact the environment • As per the project work plans, potential hazards should be evaluated and corrected • Potential hazards should be evaluated and corrected • If hazard(s) (e.g., free product, vapors) may exist, the driller should be informed of the potential hazard(s) before starting work 4.2.3 Mobilization Once the site is prepared, the rig is mobilized and located over the groundwater well. • Level the rig with a set of hydraulic pads attached to the front and rear of the rig • Raise the mast slowly and carefully to prevent tipping or damaging the rig and avoid obstructions or hazards • Appropriate barriers and markers should be in place before drilling, as per the site health and safety plan 4.3 Development Procedures Perform well development as soon as practical after well installation, but in compliance with applicable state or local requirements for seal curing times, which may range from a minimum of 48 to 72 hours following well installation. [PFAS Project]:The cap and all internal components of the well casing above the water table shall be rinsed with PFAS-free water to remove all traces of soil, sediment, and cuttings, before and/or during well development. Dedicated materials shall be used for well development. Record details of development activities in the Well Development form (SWE-FFRM-402.00). 1. Measure and record the water level and total depth of the well using a water level indicator per SWE-FSOP-102 (Groundwater and NAPL Measurements). Note any accumulated sediment thickness, and record information in the FLB and on form SWE-FFRM-402.00(Well Development). 2. Begin well development by removing any accumulated sediment from the bottom of the well using the bailer. Repeat this process until as much accumulated sediment as possible has been removed from the bottom of the well. Page 9 of 11