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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane walnut Creek.CA 94598 (925)988-9600 FAX(9Z 5)988-9673 <br /> �tiw77 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)911-9600 FAX(916)921-010 0 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Pacific Environmental Group Client Project ID Tosco 5417, Manteca, CA <br /> 11315 Sunrise Gold Circle, Ste M <br /> Rancho Cordova, CA 95742 <br /> Attention Mike Mitchener QC Sample Group S808234 Reported Aug 26, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead <br /> Method EPA 6010 <br /> Analyst J Kelly <br /> Concentration <br /> Spiked 100 mg/kg <br /> LCS Batch# 8080240-GS1 <br /> Date Prepared 08/24/98 <br /> Date Analyzed 08/26/98 <br /> Instrument 1 D # MV-4 <br /> LCS <br /> Recovery- 95 <br /> Control Limits 80-120% <br /> MS/MSD <br /> Batch#• 5808234-01 <br /> Date Prepared. 08/24/98 <br /> Date Analyzed 08/26/98 <br /> Instrument I D # MV-4 <br /> Matrix Spike <br /> % Recovery 82 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 88 <br /> Relative % <br /> Difference 71 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL M1 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 /> L7;ynda CSchneider <br /> Project Manager/Sacramento Laboratory <br /> S808234 PES <2> <br />