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Duplicate Samples. Dupticatc ,anlpies "ul be collected to uucument fieid precision. <br /> For each sampling event, duplicate monitoring ,cell samples wiil be collected at a <br /> specified frequency, typically 10 percent. Where possible, field duplicates will be taken <br /> at sampling points known or suspected to contain constituents of interest. Duplicates will <br /> be packed and shipped "blind" (o the laboratory for analvsis with the samples from that <br /> particular event (i.e..these samples will not exhibit any special markings indicating that <br /> they are quality control samples). <br /> Laboratory Quality Assurance Procedures <br /> Laboratory quality assurance procedures will include those required under the DTSC <br /> Hazardous Waste Testing Program. Specific laboratory quality assurance procedures are <br /> included in the laboratory QA manclal for surrogate recoveries, matrix spike recoveries, <br /> and matrix spike duplicate (or duplicate) results. <br /> Method blanks will be analyzed daily to assess the effect of the labomtory environment <br /> on the analytical results. ,Method blanks will be performed for each parameter analyzed. <br /> Each sample to be analyzed for ori*anic parameter~ will contain surrogate spike <br /> compounds. The surrogate recoveries will be uaed to determine if the analytical <br /> instruments are operating within limits. Surrogate recoveries will be compared to control <br /> limits established and updated by the laboratory based on its historical operation. <br /> Matrix spikes will be analyzed at :1 frequency of approximately 10 percent. Matrix spike <br /> results will be evaluated to determine whether the sample matrix is interfering with the <br /> laboratory analysis and provide a measure of the accuracy of the analytical data. Matrix <br /> spike recoveries will be compared to control limits established and updated by the <br /> laboratory based on its historical operation. <br /> Laboratory duplicates will be analyzed at a frecluencv of approximately 10 percent. Spike <br /> duplicate results will be evaluated to determine the reproducibility (precision) of the <br /> analytical method. Reproducibility values will be compared to control limits established <br /> and updated by the laboratory based on its historical operation. <br /> Laboratory QC data will be included with the analytical results. This QC data will <br /> include method blanks. surrogate spike recoveries (for organic parameters only), matrix <br /> spike recoveries, and matrix spike dupilcales. <br /> FRE/Sample.arc-93/jes:0 A-7 Rev.0,0621/95 <br />