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@10uanterra En"ronmenral Services Quanterra Environmental Services- Western Region tQuality Control Definitions Q param r n Do.finftion ' A set of up to 20 field samples plus associated laboratory QC QC Batch samples that are similar in composition(matrix)and that are processed within the same time period with the same reagent ' and standard lots Consist of a pair of LCSs analyzed within the same QC batch Duplicate Control Sample to monitor precision and accuracy independent of sample ' (DCS) matrix effects This QC is performed only if required by client or when insufficient sample is available to perform MS/MSD A second aliquot of an environmental sample, taken from the same sample container when possible,that is processed independently with the first sample aliquot The results are Duplicate Sample(DU) used to assess the effect of the sample matrix on the precision of the analytical process The precision estimated using this sample is not necessarily representative of the ' precision for other samples in the batch A volume of reagent water for aqueous samples or a contaminant-free solid matrix(Ottawa sand) for soil and Laboratory Control Sample sediment samples which is spiked with known amounts of (LCS) representative target analytes and required surrogates An LCS is carried through the entire analytical process and is ' used to monitor the accuracy of the analytical process independent of potential matrix effects A field sample fortified with known quantities of target ' analytes that are also added to the LCS Matrix spike Matrix Spike and Matrix Spike duplicate is a second matrix spike sample MSs/MSDs are Duplicate (MS/MSD) carried through the entire analytical process and are used to determine sample matrix effect on accuracy of the measurement system The accuracy and precision estimated using MS/MSD is only representative of the precision of the sample that was spiked A sample composed of all the reagents(in the same quantities) in reagent water carried through the entire Method Blank(MB) analytical process The method blank is used to monitor the ' level of contamination introduced during sample preparation steps Organic constituents not expected to be detected in ' environmental media and are added to every sample and QC Surrogate Spike at a known concentration Surrogates are used to determine the efficiency of the sample preparation and the analytical Lprocess Source Quanterra®Quality Control Program,Policy QA-003, Rev 0,8/19/96