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iN �ccOq <br /> U <br /> U -f <br /> S•TL Sacramento Certifications/Accreditation <br /> FArkansas <br /> ska UST-055 Oregon CA 200005 <br /> NA South Carolina 87014001 <br /> 1IN_... --- �>p -` . 'i,hlt P(f°�!F� �'�l� _:.-'m�n.. : im?°.iL' ''u.j�'`'8 ""i} <br /> Connecticut PH-0691 _ Virginia <br /> 00178 <br /> MINN4 �,Y�n ' ai > <br /> Georgia 960 West Virginia 9930C,334 <br /> E <br /> Louisiana* 01944 NFESC NA <br /> v 4 <br /> I <br /> - <br /> New Terse * CA005 USDA Foreign Plant 37 82605 <br /> F <br /> mmlEm <br /> 'NELAP accredited. A mo'e detailed parameter list is available upon request. <br /> (C Parameter Definitions <br /> QC Batch: The QC Melt consists of a set of up to 20 field samples that behave similarly(i.e.,same matrix) <br /> and are processed using t he same procedures,reagents,and standards at the same time- <br /> Method Blank: An<nalytical 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 (LCSILCSD): <br /> An aliquot of blank matr x spiked with known amounts of representative target analytes. The LCS(and LCSD <br /> as required)is carried thi ough 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:he process. <br /> Duplicate Sample (DU): Different aliquots of the same sample are analyzed to evaluate the precision of <br /> an analysis. <br /> Surrogates: Organic ;ompounds not expected to be detected in field samples,which behave similarly to <br /> target analytes. These at.added to every sample within a batch at a known concentration to determine the <br /> efficiency of the sample I reparation and analytical process. <br /> Matrix Spike and N atrix Spike Duplicate( SIMSD): 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 appropriaten sss of the method for a particular matrix. The percent recovery for the respective <br /> compound(s)is then cale elated. The MSD is a second aliquot of the same matrix as the matrix spike,also <br /> spiked,in order to detern dne 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 perfor tied for client or QAPP requirements. <br /> Control Limits: The -eported 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 /> 33JI40296 STL Sacramento 916-373-5600 2 of 63 <br />