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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 fAX(650)364-9233 <br /> 484 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> . -a)�rlll� Analytical 819 Stnker Avenue Sulte 8 Sacramento CA 95834 (916)921-9680 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br />*a-ciflc Environmental Group Client Project 110 Chevron 9-9840, Stockton, CA <br /> 19315 Sunrise Gold Circle, Ste M Matrix Solid <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group S809378 Reported Oct 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> MTBE Methanol <br /> Method- EPA 8260 ISHS <br /> Analyst A B K TS <br /> Concentration <br /> Spiked 2,500 Mg/kg 8 0 mglkg <br /> LCS Batch# LCS100998 ISSLCS2 <br /> 100698 <br /> Date Prepared 10/09/98 10/06/98 <br /> Date Analyzed: 10/12/98 10/06/98 <br /> Instrument I D#. GCIMS-2 GCV-01 <br /> LCS % <br /> Recovery* 92 80 <br /> Control Limits. 70-130% 70-130% <br /> MS/MSD <br /> Batch# 8100369 ISSB100298 <br /> Date Prepared 10/09/98 10/02/98 <br /> Date Analyzed 10/10/98 10/02/98 <br /> Instrument LD# GUMS-2 GCV-01 <br /> Matrix Spike <br /> % Recovery* 96 80 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 108 81 <br /> Relative% <br /> Difference: 12 1 6 <br /> Please Note <br /> The LCS is a control sample of known, Interferent free matrix that is analyzed using the same reagents, <br /> SEQU IA 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/MSD's are advisory only <br /> �� and are not used to accept or reject batch results <br /> nch C Schneider#PJr <br /> oject Manager/Sacramento Laboratory <br /> S809378 PES aha <br /> t� <br />