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Grorencltivater alorritorit:g Work Plan 1950 West Fremont Sheet,Stockton, California Samples to be analyzed for dissolved metals will be field filtered prior to analysis. 2.4 QUALITY ASSURANCE/QUALITY CONTROL 2.4.1 Field Quality Control Samples To veriA, the appropriateness of the quality assurance and quality control(QA/QC)procedures during the field program,the QA/QC plan includes the collection and analysis of: • One field duplicate groundwater sample,and • One trip blank to accompany each cooler containing the samples for VOC analysis. All samples will be delivered under chain of custody for analysis by a state-certified analytical laboratory. Field Duplicates: Field duplicate groundwater samples are additional samples that will be collected independently at one sampling location during one act of sampling. Both samples will be analyzed for the same parameters to verify sampling and analytical precision. Field duplicates for the groundwater samples will be collected by sequentially filling a sample container for the parent sample and then the identical sample container for the field duplicate sample, starting with the containers for volatile analyses, followed by the containers for other analyses. Each duplicate will be assigned separate sample numbers for blind submission to the laboratory. Trip Blank Samples: Trip blank samples are samples that will be collected to check for potential cross- contamination during sample collection. shipping, or laboratory handling. 2.4.2 Laboratory Quality Control Samples Laboratory QC samples will be analyzed to monitor the precision and accuracy of the laboratory results. The laboratory QC samples will consist of method blanks and laboratory control samples. In addition. surrogate spikes and internal standards will be added to samples and evaluated.as applicable for each method. 2.4.3 Data Review and Validation The analytical data will be reported as USEPA Level It data that will consist of the following: • A copy of the signed COC and sample receiving records indicating the date and time of sample receipt in laboratory. • Adequate information to cross-reference field sample numbers to laboratory sample numbers and to identify applicable laboratory QC samples with the field samples. • Summary forms which include the analytical method used,date of extraction(if applicable), date Project 102790 7 December 2007