COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

Enseco A Coming Company ENSECO CAL LAB'S QUALITY ASSURANCE PROGRAM Enseco Cal Lab has implemented an extensive Quality Assurance (QA) program to ensure the production of scientifically sound, legally defensible data of known documental quality. A key element of this program is Enseco's Laboratory Control Sample (LCS) system. Controlling lab operations with LCS (as opposed to matrix spike/matrix spike duplicate samples) , allows the lab to differentiate between bias as a result of procedural errors versus bias due to matrix effects. The analyst can then identify and implement the appropriate corrective actions at the bench level , without waiting for extensive senior level review or costly and time-consuming sample re- analyses. The LCS program also provides our client with information to assess batch, and overall laboratory performance. Laboratory Control Samples - (LCS) Laboratory Control Samples (LCS) are well -characterized, laboratory generated samples used to monitor the laboratory's day-to-day performance of routine analytical methods. The results of the LCS are compared to well -defined laboratory acceptance criteria to determine whether the laboratory system is "in control " . Three types of LCS are routinely analyzed: Duplicate Control Samples (DCS) , Single Control Samples (SCS) , and method blanks. Each of these LCS are described below. Duplicate Control Samples. A DCS is a well -characterized matrix (blank water, sand, sodium sulfate or celite) which is spiked with certain target parameters and analyzed at approximately 10% of the sample load in order to establish method-specific control limits. Single Control Samples. An SCS consists of a control matrix that is spiked with surrogate compounds appropriate to the method being used. In cases where no surrogate is available, (e.g. metals or conventional analyses) a single control sample identical to the DCS serves as the control sample. An SCS is prepared for each sample lot. Accuracy is calculated identically to the DCS. Method Blank Results. A method blank is a laboratory-generated sample which assesses the degree to which laboratory operations and procedures cause false-positive analytical results for your samples.