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Qw`uanterra <br /> Quanterra - Western Region <br /> Quality Control Definitions <br /> A set of up to 20 field samples plus associated laboratory QC <br /> QC Batch samples that are similar in composition (matrix)and that are <br /> processed within the same time period with the same reagent <br /> and standard lots <br /> Consist of a pair of LCSs analyzed within the same QC batch <br /> Duplicate Control Sample to monitor precision and accuracy independent of sample <br /> (DCS) matrix effects This QC is performed only if required by <br /> client or when insufficient sample is available to perform <br /> MS/MSD <br /> A second aliquot of an environmental sample, taken from the <br /> same sample container when possible, that is processed <br /> independently with the first sample aliquot The results are <br /> Duplicate Sample(DU) used to assess the effect of the sample matrix on the precision <br /> of the analytical process The precision estimated using this <br /> sample is not necessarily representative of the precision for <br /> other samples in the batch <br /> A volume of reagent water for aqueous samples or a <br /> contaminant-free solid matrix(Ottawa sand) for soil and <br /> Laboratory Control Sample sediment samples which is spiked with known amounts of <br /> (LCS) representative target analytes and required surrogates An <br /> LCS is carried through the entire analytical process and is <br /> used to monitor the accuracy of the analytical process <br /> independent of potential matrix effects <br /> A field sample fortified with known quantities of target <br /> analytes that are also added to the LCS Matrix spike <br /> Matrix Spike and Matrix Spike duplicate is a second matrix spike sample MSs/MSDs are <br /> Duplicate(MS/MSD) carried through the entire analytical process and are used to <br /> determine sample matrix effect on accuracy of the <br /> measurement system The accuracy and precision estimated <br /> using MS/MSD is only representative of the precision of the <br /> sample that was spiked <br /> A sample composed of all the reagents (in the same <br /> quantities) in reagent water carried through the entire <br /> Method Blank(MB) analytical process The method blank is used to monitor the <br /> level of contamination introduced during sample preparation <br /> steps <br /> Organic constituents not expected to be detected in <br /> environmental media and are added to every sample and QC <br /> Surrogate Spike at a known concentration Surrogates are used to determine <br /> the efficiency of the sample preparation and the analytical <br /> process <br /> Source Quanterra®Quality Control Program, Policy QA-003, Rev 0, 8/19/96 <br />