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ACcI&M-MLYANNIVI-E S"I0 <br /> r <br /> TL <br /> �4 to <br /> STL Sacramento Certifications/Accreditations <br /> Certifyinc, State Certificate# Certifyin,- State Certificate# <br /> Alaska UST-055 Own* CA 200005y <br /> Arkansas 04-067-0 South Carolina 87014002 <br /> Colorado NA Utah* UAN1 <br /> a�.. <br /> ¢� IQ P <br /> !F € <br /> Florida* E87570 Washinton C087 <br /> ee`vu ¢ E yygg�„is B fissi{:3�:4ir <br /> Hawaii NA Wisconsin 998204680 <br /> Mich' an 9947 USACE NA <br /> °°°; 1 <br /> New Terse * CA005 USDA Forei n Soil 5-46613 <br /> i i e �p�6y g.. iImim s.°'a ; :x �ray?y� �� <br /> 8& $�=P£ 866°RSPE¢Q`P¢ B ¢8�°B�Sl&11Ib3'.tC¢6E?=:Im.e.@3.@�I.=aPfiey¢;$t <br /> *NELAP accredited. A more detailed parameter list is available upon request.Update 1127105 <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 /> 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 analytical <br /> process independent of potential matrix effects. If an LCSD is performed,it may also used to evaluate the <br /> precision of the process. <br /> Duplicate Sample (DU): Different aliquots of the same sample are analyzed to evaluate the precision of an <br /> 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 indicate <br /> the appropriateness of the method for a particular matrix. The percent recovery for the respective compound(s) <br /> is then calculated. The MSD is a second aliquot of the same matrix as the matrix spike,also spiked,in order to <br /> 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 /> G5L270154 STL Sacramento(916)373-5600 2 of 26 <br />