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Sonic Drilling Field Standard Operating Procedure SWE-FSOP-302;Revision 0 Ahtna Southwest Environmental Operations 1.0 Introduction 1.1 Purpose The purpose of this standard operating procedure (SOP) is to direct field staff in the proper techniques and documentation of drilling operations involving sonic (also known as Rotosonic) drilling equipment. 1.2 Scope The scope of this SOP applies to field staff conducting drilling oversight.The SOP includes guidance for the performance, management, and completion of sonic drilling activities, including a description of staff responsibilities, relevant documentation, equipment, procedures, and quality control. Potential hazards related to drilling are addressed in project-specific Accident Prevention Plans (APP) and Site Safety and Health Plans. 1.3 Responsibilities Field Team Lead (FTL). The FTL is responsible for reviewing 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. Field Geologist. A Field Geologist is responsible for overseeing drilling activities according to project specifications. The Field Geologist is a registered geologist or a person performing work under the supervision of a registered geologist. Project Geologist. The registered Project Geologist is responsible for oversight of the drilling subcontractor, logging geologic materials per SWE-FSOP-201, "Soil Classification," and field documentation. When a Field Geologist performs the oversight, the Project Geologist is responsible for fieldwork variances/deficiencies, completeness and accuracy of field documentation, and approval of the boring logs. 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 are considered the best methods for the current project. Safety Representative.The Safety Representative meets the experience and training requirements of the current version of U.S. Army Corps of Engineers 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 and incidents and actions to correct those. If the circumstance warrants,the FTL approves those actions and 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 the 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 11