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��uanterra <br /> Environmental <br /> services <br /> QUANTERRA ENVIRONMENTAL SERVICES QUALITY ASSURANCE PROGRAM <br /> Quanterra Environmental Services has implemented an extensive Quality <br />' Assurance (QA) program to ensure the production of scientifically sound, <br /> legally defensible data of known documental quality. A key element of this <br /> program is Quanterra's Laboratory Control Sample (LCS) system. <br /> Controlling lab operations with LCS (as opposed to matrix spike/matrix <br />' spike duplicate samples) , allows the lab to differentiate between bias as a <br /> result of procedural errors versus bias due to matrix effects. The analyst <br /> can then identify and implement the appropriate corrective actions at the <br />' butch level , without waiting for extensive senior level review or costly <br /> and time-consuming sample re-analyses. The LCS program also provides our <br /> client with information to assess batch, and overall laboratory <br /> performance. <br /> Laboratory Control Samples - LCS <br />' Laboratory Control Samples (LCS) are well-characterized, laboratory <br /> generated samples used to monitor the laboratory's day-to-day performance <br /> of routine analytical methods. The results of the LCS are compared to <br />' well--defined laboratory acceptance criteria to determine whether the <br /> laboratory system is "in control ". Three types of LCS are routinely <br /> analyzed. Duplicate Control Samples (DCS) , Single Control Samples (SCS) , <br /> and method blanks. Each of these LCS are described below. <br /> Duplicate Control Samples. A DCS is a well-characterized matrix (blank <br />' water, sand, sodium sulfate or celite) which is spiked with certain target <br /> parameters and analyzed at approximately 103 of the sample load in order to <br /> establish method--specific control limits. <br />' <br /> Single Control Samples An SCS consists of a control matrix that is spiked <br /> with surrogate compounds appropriate to the method being used. In cases <br /> where no surrogate is available, (e.g. metals or conventional analyses) a <br /> single control sample identical to the DCS serves as the control sample. <br /> An SCS is prepared for each sample lot. Accuracy is calculated identically <br /> to the DCS <br /> Method Blank Results. A method blank is a laboratory-generated sample <br /> which assesses the degree to which laboratory operations and procedures <br /> cause false-positive analytical results for your samples. <br />