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Aquifer Testing Standard Operating Procedure SWE-FSOP-500,•Revision 0 Ahtna Southwest Environmental Operations 1.0 Introduction 1.1 Purpose This Standard Operating Procedure (SOP) establishes guidelines and procedures for conducting aquifer testing. Proper testing guidelines and procedures are necessary to effectively evaluate aquifer parameters and characteristics.The project work plans will provide additional specific aquifer testing procedures and requirements. 1.2 Scope The scope of this SOP applies to field staff performing aquifer testing activities. The field staff may be employed by Ahtna or by a subcontractor. Trained environmental professionals will be engaged in or directly supervise the subcontractors' aquifer testing procedures. Per- and polyfluoroalkyl substances (PFAS) friendly procedures are also provided in this SOP. When required by the project, use the PFAS-free equipment, materials, and procedures recommended in this SOP which is indicated by [PFAS Projects]. 1.3 Responsibilities Field Team. A Field Team is one or more individuals working together. The Field Team is responsible for overseeing and performing aquifer testing activities as specified in this SOP. Field Team Lead (FTL). The FTL reviews project work plans to understand the health and safety needs, procedural specifications,and field documentation requirements.The FTL is responsible for reviewing and confirming the adequacy of the fieldwork documentation. Project Lead (PL). The PL is responsible for providing adequate resources to the field staff and ensuring the Field Team has adequate experience and training to comply with the SOP successfully. The PL is responsible for approving and documenting techniques not described in this SOP but considered the best methods for the current project. Safety Representative.The Safety Representative meets the experience and training requirements of the current USACE EM-385-1-1 Safety and Health Requirements. The Safety Representative oversees site- specific health and safety activities and ensures compliance with the project requirements. The Safety Representative notifies the FTL of safety deficiencies, incidents, and actions to correct those. The FTL approves those actions or, if the circumstance warrants, notifies the PL and Site Safety and Health Officer for their approval. Quality Control Lead (QC Lead).The QC Lead ensures work inspections are performed using the 3-Phases of Quality Control method described in the project work plans. The QC Lead notifies the PL of quality deficiencies and actions to correct those. The PL approves those actions or notifies the SWE Field QC Manager for their approval if the circumstance warrants involvement. Page 4 of 17