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• Page 6 <br /> 2.1.2 Laboratory QC Procedures <br /> The laboratory QC procedures completed for samples submitted under this SAP will follow the QC <br /> protocols outlined in the Environmental Protection Agency's (EPA's) Contract Laboratory Program <br /> (CLP) standards (EPA, 1989). The specific precision and accuracy objectives will be those <br /> established for the EPA CLP (EPA, 1989). Table 3 summarizes the laboratory QC limits. <br /> Laboratory QC procedures for each analytical method used will be met and reported by the labora- <br /> tory for sampling events conducted as part of this SAP. A full CLP-compatible deliverable includ- <br /> ing all raw data will be available, if required. Laboratory QC samples will include a combination of <br /> the following samples defined below. <br /> 2.1.2.1 Laboratory Control Sample <br /> A Laboratory Control Sample (LCS) is a sample of known composition containing the <br /> compound(s)representative of the target analytes and is used to document method performance. <br /> • 2.1.2.2 Preparatory Blank <br /> A preparatory blank is an analytical control sample prepared from laboratory-grade DS/DI water to <br /> which all reagents are added in the same volumes or proportions as used in sample processing. The <br /> preparatory blank should be carried through the complete sample preparation and analytical <br /> procedure. This blank is useful in documenting contamination resulting from the analytical process. <br /> 2.1.2.3 Matrix Spike <br /> A matrix spike is prepared in the laboratory and is an aliquot of sample spiked with a known <br /> concentration of target analyte(s). The spiking occurs prior to sample preparation and analysis. A <br /> matrix spike is used to document the bias of a method in a given sample matrix. <br /> 2.1.2.4 Matrix Spike Duplicate <br /> A matrix spike duplicate is an intralaboratory split of a sample that has been spiked with a known <br /> concentration of target analyte(s). The spiking occurs prior to sample preparation and analysis. <br /> The matrix spike duplicates are used to document the precision of a method in a given sample <br /> matrix. <br /> • <br /> CO2073 <br /> PRIVILEGED AND CONFIDENTIAL <br /> _ = Environments <br /> c:�rRotecrswioz-ooiutii75iozooi[6/za961 '-NOW <br />