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Appendix A Quality Assurance/Quality Control Plan • Analysis of laboratory QC samples in accordance with their accredited plan. A.3.1 Laboratory QC Samples Laboratory QC samples will be analyzed with each soil and soil gas sample batch. These data willbe included in the final project analytical report submitted by the laboratory with the sample results. Data validation will be completed by the laboratory manager and the QA Director to ensure data meet acceptable laboratory accuracy and precision requirements and to ensure data are representative of work area conditions. Laboratory QC samples may include the following as required by the analytical method: • Method blank: A method blank will be analyzed at a frequency specified in the EPA method protocol. At minimum, one method blank will be analyzed with each sample batch. This method blank is used to identify if false values were caused by the analytical instruments or the laboratory sample preparation methodology. • Matrix spike and matrix spike duplicates: A spiked sample will be analyzed at a frequency specified in the EPA method protocol. At minimum, one matrix spike and matrix spike duplicate will be analyzed with each sample batch. The laboratory will conduct these analyses to ensure that the method recovery of the compounds is within acceptable limits. • Surrogate spike compounds: Each method blank, standard, and environmental sample will be spiked with surrogate compounds prior to purging or extraction. The surrogate spike recoveries will be evaluated to ensure they fall within the control limits specified by the analytical method, indicating matrix interference did not occur to the samples during analysis. • Check sample column check sample and column check sample blank: The laboratory will run these and any other QC samples specified by the method to ensure accuracy and validity of the analytical result. A.4 DATA REDUCTION,VALIDATION, AND REPORTING The Responsible Manager/QA Director will be responsible for evaluation of the field QC data to ensure false values were not introduced to the samples as a result of the sample methodology and field procedures. Further, laboratory QC data will be evaluated to ensure false values were not caused by the analytical instruments and that all QC samples were recovered within acceptable control limits, indicating compounds were recovered accurately at concentrations representative of Site conditions and matrix interference did not occur. The Responsible Manager/QA Director will be responsible for tabulation of the project data set provided by the laboratory and validation and subsequent qualification of the data set, as necessary, based on the results of the evaluation of the field and laboratory QC sample data. TERRA PACIFIC GROUP Page A-4 of A-5