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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FX(65o) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 F1,x(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 F1Ji(916)921-0100 <br /> Analytical 145'5 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 RX(707)792-0342 <br /> IRP9 <br /> ra8ient 1=nvlronmental Client Project ID 'Conrady Property <br /> P O Box 8002 Matrix Water <br /> Stockton, CA 95208 <br /> Attention Vic Cherven QC Sample Group S809299 Reported Oct 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> MTBE MTBE <br /> Method: EPA 8260 EPA 8260 <br /> Analyst: N Nelson N Nelson <br /> Concentration <br /> Spiked- 50lig/L 50lig/L <br /> LCS Batch#• LCS100698 LCS100798 <br /> Date Prepared: 10/06/98 10/07/98 <br /> Date Analyzed: 10106198 10/07/98 <br /> Instrument I D#: GUMS-2 GCIMS-2 <br /> LCS% <br /> Recovery' 110 104 <br /> Control Limits 65-135% 65-135% <br /> MSIMSD <br /> Batch# 8100408 8100408 <br /> Date Prepared 10/07/98 10107/98 <br /> Date Analyzed. 10107/98 10107/98 <br /> Instrument LD#. GUMS-2 GC/MS-2 <br /> Matrix Spike <br /> % Recovery: 102 102 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 106 106 <br /> Relative% <br /> Difference 38 38 <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%recoverrr data is used for <br /> validation of sample batch results Due to matnx effects,the QC limits for MS/MSD's are advisory only <br /> 21G�7 and are not used to accept or reject batch results <br /> r Sc Heider Manager/Sacramento Laboratory <br /> S609299 UES <12D <br />