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tiJ E1 iseco <br /> Corning Environmi ntnf Services <br /> ENSECO CAL LAB'S QUALITY ASSURANCE PROGRAM <br /> I <br /> Enseco Cal Lab has implemented an extensive Quality Assurance (QA) program <br /> to ensure the production of scientifically sound, legally defensible data <br /> I of known documental quality. A key element of this program is Enseco's <br /> Laboratory Control Sample (LCS) system. Controlling lab operations with <br /> LCS (as opposed to matrix spike/matrix spike duplicate samples) , allows the <br /> lab to differentiate between bias as a result of procedural errors versus <br /> bias due to matrix effects. The analyst can then identify and implement <br /> the appropriate corrective actions at the bench level , without waiting for <br /> extensive senior level review or costly and time-consuming sample re- <br /> analyses. The LCS program also provides our client with information to <br /> assess batch, and overall laboratory performance. <br /> Laboratory Control Samples -(LCS)_ <br /> I 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 Sales. 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 10% of the sample load in order to <br /> establish method-specific control limits. <br /> Single Control Samples. An SCS consists of a control matrix that is spiked <br /> I 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 /> Ito 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 /> I <br />