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Sampling and Analysis Plan for Phase II Environmental Site Assessment South Pointe Property: 701, 705, 833, 855 West Weber Avenue Stockton, California Project and Data Quality Objectives May 17, 2021 3.4 DATA REVIEW AND VALIDATION Because of the limited scope, duration, and investigative nature of the project, data will not undergo validation by a third party but will be evaluated by the Stantec project team. Data validation procedures are fully described in the project QAPP and are summarized below. • Project data will be subject to a Tier 1 review. Tier 2 review will be limited to review of the DQI acceptance parameters detailed in Table 3-3, or as deemed necessary based on completion of the Tier 1 review. • Field data will be verified by the Stantec QA manager by reviewing field documentation, COC records, field instrument calibration records, etc. Any deviations from acceptance criteria will be noted in the case narrative. The QA manager will also verify the use of blanks and duplicates. • Laboratory data will be validated by the Stantec QA manager, a process which will identify data as being acceptable, of limited usability, qualified/estimated, or rejected. Data validation procedures used by the project analytical laboratories are described in the project QAPP. • Potential types of corrective action needed to address unusable data may include resampling or reanalysis of samples. Corrective actions will be considered based on factors such as feasibility and the degree to which flagged data is critical to decision-making. Should Stantec's QA manager identify a situation requiring corrective action, the Stantec project manager will be responsible for approving implementation of the corrective action and confirming the action's effectiveness. Is DATA MANAGEMENT The Stantec QA manager will review field notes and laboratory analytical reports. Data validation reports and laboratory data summary sheets will be included in the final assessment report. Before submittal, the assessment report will undergo technical and independent review, and record of those reviews will be included in the final deliverable. The technical and independent reviews will ensure that data have been reported and discussed correctly. The electronic laboratory report will be available as an Excel spreadsheet or comma-separated values (csv)file. 3.6 ASSESSMENT OVERSIGHT The assessment oversight and review framework are described in the project QAPP. Key roles and responsibilities are summarized in Table 3-6 below. M Project No.: 185704833.5.3&5.4 3.1