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1 <br /> C la ACC040 <br /> � ATL <br /> i' V -� <br /> C S <br /> STL Sacramento Certifications/Accreditations <br /> Ing st�lle <br /> Alaska UST-055 Ore on CA 200005 <br /> Arkansas NA South Carolina 87414001 <br /> Connecticut PH-0691 Virginia 00178 <br /> H I ,ry <br /> Geor is 960 West Vir Inca 9930C,334 <br /> I I <br /> Louisiana* 01944 NFESC NA <br /> Hill <br /> IMMUNE <br /> New Jerre CA005 USDA Foreign Plant37-82605 <br /> � <br /> *NELAPa ocredt#ed. Amore detailed parameter list is available upon request. <br /> QC Parameter Definitions <br /> QC Batch: The QC batch consists of a set of up to 20 field samples that behave similarly i.e.,same matrix <br /> P Y( ) <br /> and are processed using the same procedures,reagents,and standards at the same time. <br /> Method Blank: An analytical control consisting of all reagents,which may include internal standards and <br /> surrogates,and is carried through the entire analytical procedure. The method blank is used to define the level <br /> of laboratory background contamination. <br /> Laboratory Control Sample and Laboratory Control Sample Duplicate (LCS/LCSD): <br /> An aliquot of blank matrix spiked with known amounts of representative target analytes. The LCS(and LCSD <br /> as required)is carried through the entire analytical process and is used to monitor the accuracy of the <br /> analytical process independent of potential matrix effects. If an LCSD is performed,it may also used to <br /> evaluate the precision of the process. <br /> Duplicate Sample (DU): Different aliquots of the same sample are analyzed to evaluate the precision of <br />{I, an analysis. <br /> Surrogates: Organic compounds not expected to be detected in field samples,which behave similarly to <br /> _ target analytes. These are added to every sample within a batch at a known concentration to determine the <br /> efficiency of the sample preparation and analytical process. <br /> Matrix Spike and Matrix Spike Duplicate(MS/MSD): An MS is an aliquot of a matrix fortified <br /> with known quantities of specific compounds and subjected to an entire analytical procedure in order to <br /> indicate the appropriateness of the method for a particular matrix, The percent recovery for the respective <br /> compound(s)is then calculated. The MSD is a second aliquot of the same matrix as the matrix spike,also <br /> I'k spiked,in order to determine the precision of the method. <br /> Isotope Dilution: For isotope dilution methods,isotopically labeled analogs(internal standards)of the <br /> native target analytes are spiked into the sample at time of extraction. These internal standards are used for <br /> quantitation,and monitor and correct for matrix effects. Since matrix effects on method performance can be <br /> judged by the recovery of these analogs,there is little added benefit of performing MS/MSD for these methods. <br /> MS/MSD are only performed for client or QAPP requirements. <br /> Control Limits: The reported control limits are either based on laboratory historical data,method <br /> requirements,or project data quality objectives. The control limits represent the estimated uncertainty of the <br /> test results. <br /> L <br /> GK190337 STL Sacramento(916)373-5600 2 of 44 <br /> I <br /> is <br />