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Sequoia <br /> Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 %00 FAX(510)988 9673 <br /> �rilr� Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group Client Project ID 920 122 1A/Chevron 9-9840 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group 8030071-0073, 0077 Reported Mar 11, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 DHS-LUFf <br /> Analyst C Lee C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 12 5 mg/kg <br /> LCS Batch# LCS030498 LCS030498 LCS030498 LCS030498 LCS030498 <br /> Date Prepared 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 <br /> Date Analyzed 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 <br /> Instrument 1 D # GCHP-1 GCHP-1 GCHP-1 GCHP 1 GCHP-3B <br /> LCS <br /> Recovery 89 85 88 88 93 <br /> Control Limits 70-130% 70-130% 70 130% 70-130% 60140% <br /> MS/MSD <br /> Batch # 8030073 8030073 8030073 8030073 8030081 <br /> Date Prepared 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 <br /> Date Analyzed 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 <br /> Instrument l D # GCHP-1 GCHP 1 GCHP-1 GCHP-1 GCHP 3B <br /> Matrix Spike <br /> % Recovery 92 90 93 93 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 90 so 92 s2 s3 <br /> Relative <br /> Difference 22 0 0 2 4 1 1 0 0 <br /> SEQUOIA ANALYTIC L Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> �� 61der <br /> �� 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/MSDs are advisory only <br /> Li �C Sehn and are not used to accept or reject batch results <br /> rolect Managacramento Laboratory <br /> 8030071 PES <20> <br />