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Ground Wafer Sampling <br /> laboratories to conduct analyses of ground-water samples In these cases, the SAP should <br /> be used by the laboratory analyzing samples for the RP <br /> Both field and laboratory QC samples should be prepared during the sampling event The <br /> following samples should be analyzed with each batch of samples(a batch may not exceed <br /> 20 samples) <br /> o One field blank suite, <br /> a One equipment rinsate (required only when non-disposable equipment is being <br /> used), <br /> a One matrix spike(when appropriate for the method), and <br /> a One duplicate sample(either a matrix duplicate or a matrix spike duplicate) <br /> in addition,a trip blank should be prepared and analyzed when samples are being analyzed <br /> for volatile organic analytes A trip blank should be prepared for each day that samples <br /> are collected <br /> The matnx-specific detection limit should be determined This determination does not <br /> need to be made on a sample batch basis, but should be made whenever the matrix is <br /> suspected to have altered, or as frequently as necessary to document that the matrix has <br /> not altered For an aquifer with relatively static hydrogeological characteristics,this may <br />' mean making a matrix-specific detection limit determination twice annually <br /> 281 Field QA/QC Program <br />' The SAP should provide for the routine collection and analysis of QC samples <br /> Various types of QC samples and blanks should be used to verify that the sample <br /> collection and handling process has not affected the quality of the samples Blanks <br />' are to be subjected to the same analysts as the ground water Contaminants found <br /> in the blanks may be the result of (1) inter-action between the sample and the <br /> container, (2) contaminated rinse water, (3) contaminated preservatives, or (4) a <br />' handling procedure that alters the sample analysis results The concentrations of <br /> any contaminants found in the blanks should not be used to correct the <br /> ground-water data The contaminant concentrations should be noted, and if the <br /> concentrations are more than an order of magnitude greater than the field sample <br /> results,the RP should re-sample the ground water All field QC samples should <br /> be prepared exactly as regular investigation samples with regard to sample <br />' volume, containers, and preservation The RP should prepare the QC samples and <br /> analyze them for all of the required monitoring parameters <br /> Other QA/QC practices such as sampling equipment calibration and <br /> decontaminationprocedures and cham-of-custody procedures should be described <br /> in the SAP Refer to the previous sections in this document for a discussion of <br /> these practices <br /> 29 <br />