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- Laboratory Quality Assurance <br /> + Documentation of instrument performance checks <br /> • Documentation of instrument calibration <br /> • Documentation of the traceability of instrument standards, samples, and data <br /> + Documentation of analytical and QC methodology (QC methodology includes use <br /> of spiked samples, duplicate samples, split samples, use of reference blanks, and <br /> check standards to check method accuracy and precision) <br /> Field Quality Assurance <br /> • Documentation of sample preservation and transportation <br /> • Documentation of field instrument calibration and irregularities in performance <br /> Internal laboratory quality assurance checks will be the responsibility of the contract <br /> laboratories Data and reports submitted by field personnel and the contract laboratory <br /> will be reviewed and maintained in the project files <br /> Tv es of Qualit7 Control Checks <br /> Samples are analyzed using analytical methods outlined in EPA Manual SW 846 and <br /> approved by the California Regional Water Quality Control Board-Central Valley Region <br /> in the Leaking Underground Fuel Tanks (LUFT) manual and appendices Standard <br /> contract laboratory quality control may include analysis or use of the following <br /> o Method blanks — reagent water used to prepare calibration standards, spike <br /> solutions, etc is analyzed in the same manner as the sample to demonstrate that <br /> analytical interferences are under control <br /> + Matrix spiked samples — a known amount of spike solution containing selected <br /> constituents is added to the sample at concentrations at which the accuracy of the <br /> analytical method is to satisfactorily monitor and evaluate laboratory data quality <br /> • Split samples — a sample is split into two separate aliquots before analysis to <br /> assess the reproducibility of the analysis <br /> • Surrogate samples — samples are spiked with surrogate constituents at known <br /> concentrations to monitor both the performance of the analytical system and the <br /> effectiveness of the method in dealing with the sample matrix <br /> • Control charts — graphical presentation of spike or split sample results used to <br /> track the accuracy or precision of the analysis <br /> + Quality control check samples — when spiked sample analysis indicates atypical <br /> instrument performance, a quality check sample, which is prepared independently <br /> of the calibration standards and contains the constituents of interest, is analyzed to <br /> confirm that measurements were performed accurately <br /> Page 4 <br />