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The USEPA Stage 4 validation consists of the items likes for USEPA Stage 2A and the following: • Review of the initial and continuing calibration for each method; • Review of instrument specific qualify control (ex. Tune checks, interference checks) for applicable methods; and • Recalculation of reported results from the raw instrument outputs. Data will be validated according to analytical method specifications, laboratory standard operating procedures, this QAPP, and applicable guidelines set forth in the following source as appropriate: • USEPA, 2001b. Region 9 Superfund Data EvaluationNalidation Guidance EPA R9QA/006.1. December. • USEPA, 2020. National Functional Guidelines for Inorganic Superfund Methods Data Review, EPA 542-R-20-006. November. • USEPA, 2020. National Functional Guidelines for Organic Superfund Methods Data Review, EPA 540-R-20-005. November. The data verification/validation will be requested based on project need by the Project Manager. The data verification/validation task will be performed and documented by the QA Manager. The QA Manager will assess whether the objectives for the analytical data have been met and apply appropriate data qualifiers as necessary. In any area not specifically addressed by the above sources, best professional judgment will be utilized and described in the data validation document. Data validation qualifiers will indicate whether results are considered estimated or rejected. Only rejected data are considered unusable for decision-making purposes; however, other qualified data may require further evaluation. Results of the data validation will be documented and summarized in a data validation memorandum. The memorandum is submitted to the Project Manager for review. The Project Manager is responsible for communicating significant issues relating to the data verification/validation process to client. Appendix C 17