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Stockton 99 Speedway Quality Assurance Project Plan April 12,2007 8.0 CORRECTIVE ACTIONS 8.1 General Overall, the data set will be considered valid if 80% of the data falls within laboratory-specified QA criteria, as well as the QC criteria specified in Section 5. Where possible, corrective actions will be taken to improve data quality based on QA/QC results. Corrective actions in the field relate to inspections of equipment, procedures, and field data. Corrective actions may also relate to laboratory analysis. 8.2 Field Sample Corrective Actions Corrective actions in the field may involve one or more of the following: • Decommissioning field equipment based on ineffectiveness, data review anomalies associated with the equipment, or signs of cross contamination; • Re-sampling. • Corrective actions made in the field will be noted in the field logbook. 8.3 Laboratory Sample Receiving The laboratory will inspect the incoming samples to verify that they meet sample container and documentation requirements. The laboratory may request re-sampling if the samples are not received according to methods outlined in Section 4 of the PEA Workplan. l 8.4 Sample Holding Times f The laboratory will notify the Project Manager if samples exceed the holding times presented in Table 1, and the sampling locations may be re-sampled. 8.5 Instrument Calibration Sample results associated with calibrations that do meet the requirements of the method will not be reported by the-laboratory. The instrument will be recalibrated and/or demonstrated prior to samples being reanalyzed. 8.6 Method QC Method QC procedures will meet requirements specified by the method or the DQO, or else be subject to corrective action by the laboratory. Eouart,Aw _Pmec..Plai).Fi,al.cbe 8-1 The Source Group,Inc.