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�O �N ACCC��O� ' STL U « U � STL Sacramento Certifications/Accreditations Alaska UST-055 Oregon CA 200005 Arizona a�, aan ?61 {, a "+T � 68-127,2. Arkansas NA South Carolina 87014001 allfo ai ` ,,,l r'r:i.� .... Connecticut PH-0691 Vir inia 00178 Georgia 960 West Vir inia 9930C,334 fiawatt. TSA ., q5t rsiri' w... s: 99"8204fi8U Louisiana* 01944 NFESC NA '.L`., f!f T NOV:'I New Jersey* CA005 USDA Foreign Plant 37-82605 S-+6613 *NELAP accredited. A more detailed parameter list is available upon request. QC Parameter Definitions QC Batch: The QC batch consists of a set of up to 20 field samples that behave similarly(i.e.,same matrix) and are processed using the same procedures, reagents,and standards at the same time. Method Blank: An analytical control consisting of all reagents, which may include internal standards and surrogates,and is carried through the entire analytical procedure. The method blank is used to define the level of laboratory background contamination. Laboratory Control Sample and Laboratory Control Sample Duplicate (LCS/LCSD): An aliquot of blank matrix spiked with known amounts of representative target analytes. The LCS (and LCSD as required)is carried through the entire analytical process and is used to monitor the accuracy of the analytical process independent of potential matrix effects. If an LCSD is performed,it may also used to evaluate the precision of the process. Duplicate Sample (DU): Different aliquots of the same sample are analyzed to evaluate the precision of an analysis. Surrogates: Organic compounds not expected to be detected in field samples, which behave similarly to target analytes. These are added to every sample within a batch at a known concentration to determine the efficiency of the sample preparation and analytical process. Matrix Spike and Matrix Spike Duplicate (MS/MSD): An MS is an aliquot of a matrix fortified with known quantities of specific compounds and subjected to an entire analytical procedure in order to indicate the appropriateness of the method for a particular matrix. The percent recovery for the respective compound(s)is then calculated. The MSD is a second aliquot of the same matrix as the matrix spike,also spiked, in order to determine the precision of the method. Isotope Dilution: For isotope dilution methods, isotopically labeled analogs(internal standards)of the native target analytes are spiked into the sample at time of extraction. These internal standards are used for quantitation, and monitor and correct for matrix effects. Since matrix effects on method performance can be judged by the recovery of these analogs,there is Iittle added benefit of performing MS/MSD for these methods. MS/MSD are only performed for client or QAPP requirements. Control Limits: The reported control limits are either based on laboratory historical data, method requirements,or project data quality objectives. The control limits represent the estimated uncertainty of the test results. 83K210162 STL Sacramento(916)373-5600 2 of 14