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Q Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9133 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-OI DO <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Oacific Environmental Croup Client Project 10 Chevron 9-9840, Stockton, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Solid <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group S809376 Reported Oct 13, 1998;, <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> MTBE Methanol <br /> Method- EPA 8260 ISHS <br /> Analyst A B K TS <br /> Concentration <br /> Spiked 2,500 pglkg 8 0 mglkg <br /> LCS Batch# LCS100998 ISSLCS2 <br /> 100598 <br /> Date Prepared 10/09/98 10/05/98 <br /> Date Analyzed 10/12/98 10/05/98 <br /> Instrument I D# GC/MS-2 GCV-01 <br /> LCS % <br /> Recovery 92 81 <br />*Control Limits: 70-130% 70-130% <br /> MSIMSD <br /> Batch # 8100369 ISSB100298 <br /> Date Prepared 10/09/98 10/02/98 <br /> Date Analyzed: 10/10/98 10/02/98 <br /> Instrument I D# GC/MS-2 GCV-01 <br /> Matrix Spike <br /> % Recovery 96 80 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 108 81 <br /> Relative % <br /> Difference 12 16 <br /> ease Note <br /> The LCS is a control sample of known, interferent free matnx 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/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> Ifida t Scaneider <br /> roject Manager/Sacramento Laboratory <br /> S809376 PES <9> <br />