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r • • 819 Striker Avenue Suite 8 <br /> + Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> SECOR International Client Project ID ARCO 434, Lodi, CA <br /> 9912 Business Park Dr, Ste 100 Matrix Soil <br /> Sacramento, CA 95827 <br /> Attention Rusty Benkosky OC Sample Group S906335 Reporter! Jul 8, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> A ALYTE <br /> Lead <br /> Method EPA 6010 <br /> Analyst J Kelly <br /> Concentration <br /> Spiked 50 mg/kg <br /> LCS Batch# LCS063099 <br /> Date Prepared 06/30/99 <br /> Date Analyzed 07/05/99 <br /> Instrument I D # MV-3 <br /> LCS <br /> 40 Recovery 108 <br /> Control Limits 80-120% <br /> MS/MSD <br /> Batch# 9062274 <br /> Date Prepared 06/80/99 <br /> Date Analyzed 07/05/99 <br /> Instrument I D #: MV-3 <br /> Matrix Spike <br /> % Recovery: 102 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 94 <br /> Relative% <br /> Difference 7 5 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> Sandra R Hanson I <br /> Project Manager/Sacramento Laboratory <br /> S906335 SES <3> <br />