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a <br /> Duplicate Sampling <br /> Duplicate (replicate)soil-samples may be collected during a sampling event, especially during <br /> confirmation sampling. The duplicate sample is assigned a unique identification number and <br /> collected as a replicate split. The duplicate sample is submitted with other soil samples as a <br /> r means to verify analytical precision. <br /> Laboratory Procedures <br /> Sequoia Analytical, a California-certified analytical laboratory located in Sacramento,performs <br /> specified chemical analyses. Sequoia Analytical provides clients with quality assurance and <br /> quality control (Q / C) data related to laboratory Protocols. Procedures include surrogate <br /> recovery data and analytical charts that describe routine application of spikes and matrix spike <br /> C documents are attached to Sierra-Pacific .quarterly <br /> duplicates. Copies of Laboratory QA/QC S q y , <br /> j monitoring reports. <br /> In addition to routine instrument calibration, replicates, spikes, blanks, spiked blanks, and <br /> certified reference materials are routinely analyzed at method-specific frequencies to monitor <br /> precision and bias. Additional components of the laboratory QA/QC program include <br /> participation in State and federal laboratory certification programs, and EPA performance <br /> evaluation studies. <br /> Data Review and Analysis <br /> Analytical results from field testing and laboratory work is routinely compared and evaluated. <br /> ; Field sampling difficulties and possible laboratory errors can often be discovered by reviewing <br /> empirical data for apparent anomalies and inconsistencies. <br /> L <br /> Serra-Pacific Groundwater Consultants Inc. C-2 <br />