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Groundwater Well Installation Work Plan Sharpe Army Depot Lathrop, California Ahtna Environmental, Inc. 16 4.0 Quality Control and Quality Assurance Quality Control (QC) encompasses the actions that control the attributes of the material, sample, process, component, system, or facility in accordance with predetermined quality requirements. The QC inspection system used by Ahtna personnel for the installation of extraction wells is based on three phases of QC for each definable feature of work: the preparatory phase, the initial phase, and the follow-up phase. During the preparatory phase, the work necessary to initiate the activity is checked before fieldwork begins. The phase is conducted in a meeting format during the daily pre-work health and safety meeting. Participants include onsite Ahtna personnel, the USACE representative, and onsite drilling personnel. During the meeting, information regarding the schedule, procurement, and the status of the related construction activity are shared and discussed. Lessons learned from previous events are shared and discussed. Initial phase inspections are conducted after activities begin, to check and document that work is being performed as discussed during the preparatory phase inspection. A QC staff member is responsible for monitoring the quality of the construction work performed. During the initial phase inspection, a representative sample of work is observed to document the work is in compliance with the specified requirements. Follow-up phase inspections are performed daily after the initial phase until the completion of the work to check and document that work is being performed according to plan. Quality Assurance includes the planned and systematic actions necessary to provide a sufficient confidence level that structure, system, or component will perform satisfactorily in service. Quality assurance includes a multi-disciplinary system of management controls backed by quality verification and overview activities that demonstrate completeness and appropriateness of achieved quality. Quality assurance inspections are performed during well drilling by USACE personnel to ensure the work is completed as planned. The activities described in the Work Plan will be conducted in accordance with the QAPP (Ahtna, 2019d).