ARCHIVED REPORTS_WORK PLAN TO ESTABLISH BACKGROUND SOIL CONCENTRATIONS

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GES • GENESIS ENGINEERING E REDEVELOPMENT analytical data. If QC standards are not met,then the cause must be ascertained and appropriate corrective action must be taken, but if the noncompliant situation can be rectified without affecting the integrity of the data,then data processing will proceed. Furthermore, if resolution of the problem will jeopardize the integrity of the data,then the sample in question must be reanalyzed, and if reanalysis fails to correct the problem,then the data will be flagged to indicate that the data are out of control limits. The internal review checks will be documented in the batch report and data review form in each data package. A minimum of 25 percent of the data generated during the investigation to Establish Background Concentrations will be validated by the Project Manager. The data validation approach will consist of a systematic review of the analytical results, associated QC methods and results, and all of the supporting data. Best professional judgment in any area not specifically addressed by U.S. EPA guidelines will be used as necessary. The following items may be reviewed by the Analytical QA Manager and Technical Coordinator to validate the data: • Sample holding times • • Documentation that the analytical results are in control and within the certified range • Documentation that data and calculations were checked by a reviewer who was not involved in the performance of sampling, analysis or data reduction • Calibration of methods and instruments • Routine instrument checks (calibration, control samples) • Documentation on traceability of instrument standards, samples, and data • Documentation on analytical methodology and QC methodology • The potential presence of interferences in analytical methods (check of reference blanks and spike recoveries) • Documentation of routine maintenance activity to ensure analytical reliability • Documentation of sample preservation and transport All data generated will be assessed for accuracy, precision, and completeness. Data assessment techniques will include routine QC checks and system audits. Precision will be assessed from analysis of duplicates and/or replicates of the same parameter at different times. Control charts will be maintained to provide a timely assessment of precision for measurement function. Accuracy will be assessed from analysis of samples spiked with known concentrations of reference materials and will be independent of the routine calibration process (reference materials will be obtained from independent sources and will . be prepared independently). William DePaoH Property 14 of 21 Quality Assumnce Project Plan February 2012