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®:� Quality Assurance/Quality Control Plan <br /> Martin Metals Finishing Inc. (Former) <br /> Stockton, California <br /> 5 DATA REVIEW AND REPORTING <br /> 5.1.1 Data Storage and Preservation <br /> CDIM will utilize DTSC's Electronic Submittal of Information (ESI) system to submit the data from this <br /> investigation through the EnviroStor website. FIP will retain all data, reports, and other documents related to this <br /> investigation for a minimum of six years after the termination of the SVA, per SVA Section 12, Record Preservation <br /> (DTSC, 2022). <br /> 5.1.2 Data Validation <br /> CDIM will perform a Level 2 Data Validation on the results received from the laboratory to verify the quality <br /> of results. This process includes reviewing the results of samples, evaluating sample handling and documentation <br /> procedures, and assessing laboratory QC data. The results of the Level 2 Data Validation will be presented in the <br /> final report. <br /> Data will be assessed by evaluating the QC sample results for groups of samples that were prepared and <br /> analyzed together. Data packages will be evaluated according to some or all of the following methods: <br /> • Accurate COC documentation; <br /> • Compliance with holding times and field preservation of samples; <br /> • Assessment of batch QC samples (e.g., method blanks, control samples, and matrix spikes) for <br /> analysis and reporting using the required specifications; <br /> • Assessment of surrogate spike recoveries (for organic methods); and <br /> • Acceptable Relative Percent Difference between samples and duplicate samples. <br /> CDIM—Fairgrounds Industrial Park Page 11 <br />