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t <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N WtSet Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 01oo <br /> Pacific 8rivironmental Group Client Project Ib 920-1221A/Chevron 9-984.0, Stockton, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sod <br /> Rancho Cordova, CA 95742 <br /> ' Attention Tim Anenson QC Sample Group 8030563-0575 Reported Mar 17, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br />' Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010B <br /> Analyst C Lee C Lee C Lee C Lee S Phillips <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg <br /> LCS Batch# LCS031698 LCS031698 LCS031698 LCS031698 LCS031698 <br />' Date Prepared 03/16/98 03/16/98 03/16/98 03/16/98 03/16/98 <br /> Date Analyzed 03/16/98 03/16/98 03/16/98 03/16/98 03/16/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 ICP-1 <br /> LCS % <br /> Recovery 96 95 97 97 96 <br /> Control Limits 70-130% 70-130% 70-130% 70130% 80120% <br />' MS/MSD <br /> Batch # 8030163 8030163 8030163 8030163 8030527 <br /> Date Prepared 03/16/98 03/16/98 03/16/98 03/16/98 03/16/98 <br /> Date Analyzed 03/16/98 03/16/98 03/16/98 03/16/98 03/16/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 ICP-1 <br />' Matrix Spike <br /> % Recovery 83 84 89 90 93 <br />' Matrix Spike <br /> Duplicate % <br /> Recovery 82 84 87 88 92 <br />' Relative <br /> Difference 12 00 23 22 1 1 <br /> SEQUOIA ANALYTIC Please Nate <br /> The LCS 1s a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> fC <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used forvalidation of sample batch results Due to matrix effects the QC limits for IVIS/MSDs are advisory only <br /> aSchneider and are not used to accept or reject batch results <br /> roleanager/Sacramento Laboratory <br /> 8030563 PES <10> <br />