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CM0001677 <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 M 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 />2.1.21 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 />21.2.2 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 />Z 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 />Page 6 <br />• <br />• <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 />C02073 <br />• <br />PRIVILEGED AND CONFIDENTIAL ' k==== <br />-' - - - -- CvlloJEC1'sKIo:-ao1u? 1:61o2 001(6120M61 .Environmental