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Sequoia 6130 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> -'Y 404 N Wiget lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 4a- ) <br /> -a- - Analytical 819 Stryker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> qaclfic environmental Group Client project Id Chevron $-9840, Stockton, 6A ' v <br /> c <br /> 11315 Sunrise Gold Circle, Ste M Matrix Solid <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group S809342 Reported Oct 12, 1998, <br /> QUALITY CONTROL DATA REPORT <br /> rALYTE MTBE Methanol <br /> Method EPA 8260 ISHS <br /> Analyst A B K TS <br /> Concentration <br /> Spiked 2,500 pg/kg 8 0 mg/kg <br /> LCS Batch# LCs 10n198 [SSLCS2 <br /> 100598 <br /> Date Prepared 10/07/98 10/05/98 <br /> Date Analyzed 10/07/98 10/05/98 <br /> Instrument I D#- GC/MS-2 GCv-01 <br /> LCS % <br /> Recovery. 108 81 <br />*Control Limits 65-135% 70-130% <br /> MS/MSD <br /> Batch# 8100339 ISSB100298 <br /> Date Prepared 10/06/98 10/02/98 <br /> Date Analyzed 10/08/98 10/02/98 <br /> Instrument I D #: GCIMS-2 GCv-01 <br /> Matrix Spike <br /> % Recovery 96 so <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 112 81 <br /> Relative% <br /> Difference. 15 16 <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%recoverydata is used for <br /> validation of sample hatch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> inda C Schneider <br /> roject Manager/Sacramento Laboratory <br /> S809342 PES <14> <br /> .f1�1, <br />