Laserfiche WebLink
4 <br /> Duplicate Sampling <br /> Duplicate (replicate) soil:samples may be collected during a sampling event, especially during <br /> r confirmation sampling. The duplicate sample is assigned a unique identification number and <br /> L collected as a replicate split. The duplicate sample is submitted with other soil samples as a <br /> means to verify analytical precision. <br /> L <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 (QA/QC) data related to laboratory protocols. Procedures include surrogate <br /> recovery data and analytical charts that describe routine application of spikes and matrix spike <br /> duplicates. Copies of laboratory QA/QC documents are attached to Sierra-Pacific quarterly <br /> t monitoring reports. <br /> L <br /> LIn 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 /> Levaluation 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 />. L <br /> Sierra-Pacific Groundwater Consultants, Inc. C-2 <br />