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EIVGEO <br /> INCORPORATED <br /> use, it must be (1) representative of actual site physical and chemical conditions, (2) comparable <br /> to previous and subsequent data and other studies, (3) complete to the extent that necessary <br /> conclusions may be reached, and (4) of known quantitative statistical significance in terms of <br /> precision and accuracy at levels appropriate for the intended use of the data. <br /> Precision will be evaluated in this study by matrix spike duplicates, field duplicate (split) <br /> samples, field blank samples, and analyte-free water travel blank samples. QA samples will be <br /> prepared by the following procedures: <br /> • One matrix spike/matrix spike duplicate (MS/MSD) sample will be generated from <br /> groundwater collected from monitoring wells representing a frequency of 1 per 20 samples. <br /> The MS/MSD samples will be collected from varying monitoring wells during each sampling <br /> event to provide a broad representation of possible groundwater matrix effects at the site. <br /> • Field duplicate samples will be collected by the filling of two sets of sample containers from <br /> the monitoring wells at a frequency of 1 sample per 10 samples. <br /> • Field blank samples will be collected by filling a set of sample containers with analyte-free <br /> or de-ionized water at the sampling site at a frequency of 1 set per 10 samples collected. <br /> • Travel blank samples will be created at the laboratory at a frequency of 1 sample per sample <br /> ice chest that travels from the laboratory to the field and back. <br /> Duplicates will be collected, numbered, packaged, and sealed in the same manner as the other <br /> samples. The samples will not be identified as duplicates on the sample labels or <br /> chain-of-custody forms so that the identity of the sample as a duplicate will be unknown to the <br /> laboratory personnel performing the analyses. The samples will be recorded as a duplicate (or <br /> field blank) in the field logbook and on the sampling form for which the sample is a duplicate (or <br /> for which the field blank was made next to). <br /> Duplicate water samples will be collected by filling all bottles for the first analysis before filling <br /> bottles for the second analysis. <br /> 4943.4.640.01 <br /> April 17, 2007 15 <br />