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� r <br /> I <br /> - 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 /> jli <br /> I - 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 /> Types of Quality Control Checks <br /> Samples are analyzed using analytical methods outlined in EPA>Manual SW 84b and <br /> p .. <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 /> 0 <br /> • 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 />�I analytical method is to satisfactorily monitor and evaluate 1 boratory data quality. <br /> 1 + 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 /> if <br /> Page 4 <br />